WO2022148968A1 - Anti-infective bicyclic peptide ligands - Google Patents

Anti-infective bicyclic peptide ligands Download PDF

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Publication number
WO2022148968A1
WO2022148968A1 PCT/GB2022/050031 GB2022050031W WO2022148968A1 WO 2022148968 A1 WO2022148968 A1 WO 2022148968A1 GB 2022050031 W GB2022050031 W GB 2022050031W WO 2022148968 A1 WO2022148968 A1 WO 2022148968A1
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WIPO (PCT)
Prior art keywords
seq
referred
amino acid
acid sequence
peptide ligand
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PCT/GB2022/050031
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English (en)
French (fr)
Inventor
Nicholas Keen
Katerine VAN RIETSCHOTEN
Katie Gaynor
Liuhong CHEN
Maximilian HARMAN
Michael Skynner
Paul Beswick
Mehdi AMOURA
Simone GIORGI
Giulia LATTANZI
Iain Lingard
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Bicycletx Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Bicycletx Limited filed Critical Bicycletx Limited
Priority to EP22701005.5A priority Critical patent/EP4274839A1/en
Priority to CN202280018293.9A priority patent/CN117062826A/zh
Priority to CA3206846A priority patent/CA3206846A1/en
Priority to JP2023541294A priority patent/JP2024503642A/ja
Priority to AU2022205543A priority patent/AU2022205543A1/en
Publication of WO2022148968A1 publication Critical patent/WO2022148968A1/en
Priority to IL304211A priority patent/IL304211A/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
    • C07K7/04—Linear peptides containing only normal peptide links
    • C07K7/08—Linear peptides containing only normal peptide links having 12 to 20 amino acids
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides

Definitions

  • the present invention relates to polypeptides which are covalently bound to molecular scaffolds such that two or more peptide loops are subtended between attachment points to the scaffold.
  • the invention describes peptides which are high affinity binders of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), particularly the spike protein S1 of SARS-CoV-2.
  • SARS-CoV-2 severe acute respiratory syndrome coronavirus 2
  • the invention also includes pharmaceutical compositions comprising said polypeptides and to the use of said polypeptides in suppressing or treating a disease or disorder mediated by infection of SARS-CoV-2 or for providing prophylaxis to a subject at risk of infection of SARS-CoV-2.
  • Coronavirus disease 2019 (COVID-19) is an infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).
  • SARS-CoV-2 severe acute respiratory syndrome coronavirus 2
  • the disease was first identified in December 2019 in Wuhan, the capital of China's Hubei province, and spread globally, resulting in a pandemic.
  • Common symptoms include fever, cough, and shortness of breath.
  • Other symptoms may include fatigue, muscle pain, diarrhea, sore throat, loss of smell, and abdominal pain.
  • the time from exposure to onset of symptoms is typically around five days but may range from two to fourteen days. While the majority of cases result in mild symptoms, some progress to viral pneumonia and multi-organ failure. As of 6 January 2021, more than 86 million cases have been reported globally, resulting in more than 1.8 million deaths.
  • the virus is primarily spread between people during close contact, often via droplets produced by coughing, sneezing, or talking. While these droplets are produced when breathing out, they usually fall to the ground or onto surfaces rather than being infectious over long distances. People may also become infected by touching a contaminated surface and then their face. The virus can survive on surfaces for up to 72 hours. It is most contagious during the first three days after the onset of symptoms, although spread may be possible before symptoms appear and in later stages of the disease.
  • the World Health Organization declared the 2019-2020 coronavirus outbreak a Public Health Emergency of International Concern (PHEIC) on 30 January 2020 and a pandemic on 11 March 2020. Local transmission of the disease has been recorded in many countries across all six WHO regions.
  • a peptide ligand specific for severe acute respiratory syndrome coronavirus 2 comprising a polypeptide comprising at least three reactive groups, separated by at least two loop sequences, and a molecular scaffold which forms covalent bonds with the reactive groups of the polypeptide such that at least two polypeptide loops are formed on the molecular scaffold.
  • SARS-CoV-2 severe acute respiratory syndrome coronavirus 2
  • composition comprising the peptide ligand as defined herein in combination with one or more pharmaceutically acceptable excipients.
  • the peptide ligand as defined herein for use in suppressing or treating a disease or disorder mediated by infection of SARS-CoV-2 or for providing prophylaxis to a subject at risk of infection of SARS-CoV-2.
  • a peptide ligand specific for severe acute respiratory syndrome coronavirus 2 comprising a polypeptide comprising at least three reactive groups, separated by at least two loop sequences, and a molecular scaffold which forms covalent bonds with the reactive groups of the polypeptide such that at least two polypeptide loops are formed on the molecular scaffold.
  • SARS-CoV-2 severe acute respiratory syndrome coronavirus 2
  • said peptide ligand is specific for the spike protein of SARS-CoV-2.
  • the spike protein (S protein) is a large type I transmembrane protein of SARS-CoV-2. This protein is highly glycosylated as it contains 21 to 35 N-glycosylation sites. Spike proteins assemble into trimers on the virion surface to form the distinctive “corona”, or crown-like appearance.
  • the ectodomain of all CoV spike proteins share the same organization in two domains: a N-terminal domain named S1 that is responsible for receptor binding and a C- terminal S2 domain responsible for fusion. CoV diversity is reflected in the variable spike proteins (S proteins), which have evolved into forms differing in their receptor interactions and their response to various environmental triggers of virus-cell membrane fusion.
  • said peptide ligand binds to either the S1 of S2 domain of the spike protein (S protein). In a yet further embodiment, said peptide ligand binds to the S1 domain of the spike protein (S1 protein). Without being bound by theory it is believed that binding to the S1 domain of SARS-CoV-2, namely the receptor binding domain of SARS-CoV-2, will prevent the virus from binding to its target (thought to be ACE2 bound to the surface of lung airway cells) to enter tissue and cause disease.
  • said loop sequences comprise 2, 3, 4, 5, 6, 7 or 8 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 3 amino acids and the other of which consists of 6 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 3 amino acids and the other of which consists of 6 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiH H ACiiPI LT GWCiii SEQ ID NO: 1
  • CiPHACiiPSLWGWCiii SEQ ID NO: 6
  • CiLHACiiPRLTHWCiii SEQ ID NO: 7
  • CiLHACiiQYLWGYCiii (SEQ ID NO: 8);
  • CiSHACiiPRLFGWCiii SEQ ID NO: 9
  • CiQHACiiPYLWDYCiii SEQ ID NO: 10
  • CiPFACiiHKLYGWCiii SEQ ID NO: 58
  • CiMKACiiPYLYGWCiii (SEQ ID NO: 59);
  • CiRHACiiTHLYGHCiii SEQ ID NO: 60
  • CiPYACiiTRLYGWCiii (SEQ ID NO: 61);
  • CiSHACiiPRLTGWCiii SEQ ID NO: 62
  • CiLHSCiiPRLSGWCiii SEQ ID NO: 63
  • CiRHSCiiPILTGWCiii SEQ ID NO: 64
  • CiPHSCiiPKLFGWCiii (SEQ ID NO: 66);
  • CiTHSCiiPYLFGWCiii (SEQ ID NO: 67); CiDWTCiiYLTMMPCiii (SEQ ID NO: 118);
  • CiDWTCiiYLRPLPCiii (SEQ ID NO: 119);
  • CiDWTCiYMSMKPCiii SEQ ID NO: 120
  • CiDWTCiYFRPLPCiii SEQ ID NO: 121
  • CiDWTCiYISPMFDCiii SEQ ID NO: 122
  • C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 3 amino acids and the other of which consists of 6 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiH H ACiiPI LT GWCiii SEQ ID NO: 1
  • CiPHACiiPSLWGWCiii SEQ ID NO: 6
  • CiLHACiiPRLTHWCiii SEQ ID NO: 7
  • CiLHACiiQYLWGYCiii (SEQ ID NO: 8);
  • CiSHACiiPRLFGWCiii SEQ ID NO: 9
  • CiQHACiiPYLWDYCiii SEQ ID NO: 10
  • CiPFACiiHKLYGWCiii SEQ ID NO: 58
  • CiMKACiiPYLYGWCiii (SEQ ID NO: 59);
  • CiRHACiiTHLYGHCiii SEQ ID NO: 60
  • CiPYACiiTRLYGWCiii (SEQ ID NO: 61);
  • CiSHACiiPRLTGWCiii SEQ ID NO: 62
  • CiLHSCiiPRLSGWCiii SEQ ID NO: 63
  • CiRHSCiiPILTGWCiii SEQ ID NO: 64
  • CiPHSCiiPKLFGWCiii (SEQ ID NO: 66); and CiTHSCiiPYLFGWCiii (SEQ ID NO: 67); wherein C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 3 amino acids and the other of which consists of 6 amino acids
  • the molecular scaffold is TATA
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from: A-(SEQ ID NO: 1)-A (herein referred to as BCY15230);
  • A-(SEQ ID NO: 6)-A (herein referred to as BCY15235);
  • A-(SEQ ID NO: 7)-A (herein referred to as BCY15236);
  • A-(SEQ ID NO: 8)-A (herein referred to as BCY15237);
  • A-(SEQ ID NO: 9)-A (herein referred to as BCY15238);
  • A-(SEQ ID NO: 10)-A (herein referred to as BCY15239);
  • A-(SEQ ID NO: 58)-A (herein referred to as BCY15364);
  • A-(SEQ ID NO: 59)-A (herein referred to as BCY15365);
  • A-(SEQ ID NO: 60)-A (herein referred to as BCY15366);
  • A-(SEQ ID NO: 61)-A (herein referred to as BCY15367);
  • A-(SEQ ID NO: 62)-A (herein referred to as BCY15368);
  • A-(SEQ ID NO: 63)-A (herein referred to as BCY15369);
  • A-(SEQ ID NO: 64)-A (herein referred to as BCY15370);
  • A-(SEQ ID NO: 65)-A (herein referred to as BCY15371);
  • BCY15372 A-(SEQ ID NO: 66)-A (herein referred to as BCY15372); and A-(SEQ ID NO: 67)-A (herein referred to as BCY15373).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 3 amino acids and the other of which consists of 6 amino acids, the molecular scaffold is TATA, the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 6)-A-[Sar e ]-[KFI] (herein referred to as BCY15303); and A-(SEQ ID NO: 63)-A-[Sar e ]-[KFI] (herein referred to as BCY15329).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 3 amino acids and the other of which consists of 6 amino acids
  • the molecular scaffold is TATB
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 118)-A (herein referred to as BCY15444);
  • A-(SEQ ID NO: 119)-A (herein referred to as BCY16927);
  • A-(SEQ ID NO: 120)-A (herein referred to as BCY16930);
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 3 amino acids and the other of which consists of 7 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 3 amino acids and the other of which consists of 7 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiDWTCiiYLNIYHECiii (SEQ ID NO: 123);
  • CiDWTCiYMDYLSNCiii (SEQ ID NO: 124);
  • CiDWTCiYLRIHEACiii (SEQ ID NO: 125);
  • CiDWTCiYMRINDACiii SEQ ID NO: 126
  • CiDWTCiYINIYNTCiii SEQ ID NO: 127
  • C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 3 amino acids and the other of which consists of 7 amino acids
  • the molecular scaffold is TATB
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 123)-A (herein referred to as BCY15445);
  • A-(SEQ ID NO: 124)-A (herein referred to as BCY16941);
  • BCY16942 A-(SEQ ID NO: 125)-A (herein referred to as BCY16942); and A-(SEQ ID NO: 126)-A (herein referred to as BCY16946).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 3 amino acids and the other of which consists of 7 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is:
  • A-(SEQ ID NO: 127)-A (herein referred to as BCY16948).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 6 amino acids. In a further embodiment, said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 6 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiLTNDCiiHSDIRYCiii SEQ ID NO: 29
  • CilTNDCiiHTSLIFCiii SEQ ID NO: 30
  • C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 6 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • BCY15335 A-(SEQ ID NO: 29)-A
  • BCY15336 A-(SEQ ID NO: 30)-A
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 6 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is:
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 8 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 8 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiVDANCiiKI Kl LQRMCiii SEQ ID NO: 3;
  • CiTSSVCiiKI KELQRKCiii SEQ ID NO: 4;
  • CiRSLLCiiEYLQRTDSCiii (SEQ ID NO: 5); CiLTKSCiiKI KM LQRVCiii (SEQ ID NO: 14);
  • CiMQPSCiiRVLQLQRVCiii SEQ ID NO: 15
  • CiALPSCiiRILHLQHRCiii SEQ ID NO: 16
  • CiH DAHCiiKI LELQH RCiii (SEQ ID NO: 17);
  • CiTSSHCiiRVLEEQRLCiii SEQ ID NO: 18
  • CiPRDRCiiPTAWLYGLCiii SEQ ID NO: 19
  • CiTPSPCiiRVKELQRACiii SEQ ID NO: 21
  • CiSTANCiiRILELQQLCiii SEQ ID NO: 26
  • CiVGRLCiiSTATDIRKCiii SEQ ID NO: 44;
  • CiRQSQCiiDWWAIRSFCiii (SEQ ID NO: 48; herein referred to as BCY16983 when complexed with TATB);
  • CiTDATCiiSI KRLQRLCiii (SEQ ID NO: 49);
  • CiSPVSCiiPSGFKFGLCiii SEQ ID NO: 50
  • CiDSPWCiiRI RSLQRQCiii (SEQ ID NO: 68);
  • CiSVGACiiRVKLLQRVCiii (SEQ ID NO: 69);
  • CiMFVPCiAVREILGLCiii SEQ ID NO: 70
  • CiSDLMCiiWYLQRTDSCiii SEQ ID NO: 1228;
  • CiNSYMCiiWYLQRTDSCiii (SEQ ID NO: 129);
  • CTSYLCiiWYLQRTDSCiii SEQ ID NO: 130
  • CiRSLMCiiWYLNQTDSCiii SEQ ID NO: 131
  • C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 8 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiVDANCiiKI Kl LQRMCiii SEQ ID NO: 3;
  • CiTSSVCiiKI KELQRKCiii SEQ ID NO: 4;
  • CiRSLLCiiEYLQRTDSCiii SEQ ID NO: 5
  • CiLTKSCiiKI KM LQRVCiii (SEQ ID NO: 14);
  • CiMQPSCiiRVLQLQRVCiii SEQ ID NO: 15
  • CiALPSCiiRILHLQHRCiii SEQ ID NO: 16
  • CiH DAHCiiKI LELQH RCiii (SEQ ID NO: 17);
  • CiTSSHCiiRVLEEQRLCiii SEQ ID NO: 18
  • CiPRDRCiiPTAWLYGLCiii SEQ ID NO: 19
  • CiTPSPCiiRVKELQRACiii SEQ ID NO: 21
  • CiSTANCiiRILELQQLCiii SEQ ID NO: 26
  • CiVGRLCiiSTATDIRKCiii SEQ ID NO: 44;
  • CiRQSQCiiDWWAIRSFCiii (SEQ ID NO: 48; herein referred to as BCY16983 when complexed with TATB);
  • CiTDATCiiSI KRLQRLCiii (SEQ ID NO: 49);
  • CiSPVSCiiPSGFKFGLCiii SEQ ID NO: 50
  • CiDSPWCiiRI RSLQRQCiii (SEQ ID NO: 68);
  • CiSVGACiiRVKLLQRVCiii SEQ ID NO: 69
  • CiM FVPCiAVREI LGLCiii SEQ ID NO: 70
  • C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 8 amino acids
  • the molecular scaffold is TATB
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 3)-A (herein referred to as BCY15334);
  • BCY15244 A-(SEQ ID NO: 15)-A (herein referred to as BCY15244);
  • BCY15245 A-(SEQ ID NO: 16)-A (herein referred to as BCY15245);
  • A-(SEQ ID NO: 17)-A (herein referred to as BCY15246);
  • A-(SEQ ID NO: 18)-A (herein referred to as BCY15247);
  • BCY15248 A-(SEQ ID NO: 19)-A (herein referred to as BCY15248);
  • A-(SEQ ID NO: 20)-A (herein referred to as BCY15249);
  • A-(SEQ ID NO: 21)-A (herein referred to as BCY15250);
  • A-(SEQ ID NO: 26)-A (herein referred to as BCY15255);
  • A-(SEQ ID NO: 48)-A (herein referred to as BCY15354);
  • A-(SEQ ID NO: 48)-A (herein referred to as BCY16534);
  • A-(SEQ ID NO: 48)-AK (herein referred to as BCY16896);
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 8 amino acids, the molecular scaffold is TATB, the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY15301 A-(SEQ ID NO: 3)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15301);
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 8 amino acids
  • the molecular scaffold is TATA
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 3)-A (herein referred to as BCY15232);
  • A-(SEQ ID NO: 4)-A (herein referred to as BCY15233);
  • A-(SEQ ID NO: 5)-A (herein referred to as BCY15234);
  • A-(SEQ ID NO: 14)-A (herein referred to as BCY15243);
  • A-(SEQ ID NO: 44)-A (herein referred to as BCY15350);
  • A-(SEQ ID NO: 68)-A (herein referred to as BCY15374);
  • A-(SEQ ID NO: 69)-A (herein referred to as BCY15375);
  • A-(SEQ ID NO: 70)-A (herein referred to as BCY15376);
  • A-(SEQ ID NO: 128)-A (herein referred to as BCY16886);
  • A-(SEQ ID NO: 129)-A (herein referred to as BCY16887);
  • A-(SEQ ID NO: 130)-A (herein referred to as BCY16889);
  • A-(SEQ ID NO: 131)-A (herein referred to as BCY16895).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 8 amino acids
  • the molecular scaffold is TATA
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from: A-(SEQ ID NO: 3)-A (herein referred to as BCY15232);
  • A-(SEQ ID NO: 4)-A (herein referred to as BCY15233);
  • A-(SEQ ID NO: 5)-A (herein referred to as BCY15234);
  • A-(SEQ ID NO: 14)-A (herein referred to as BCY15243);
  • A-(SEQ ID NO: 44)-A (herein referred to as BCY15350);
  • A-(SEQ ID NO: 68)-A (herein referred to as BCY15374);
  • A-(SEQ ID NO: 69)-A (herein referred to as BCY15375); and A-(SEQ ID NO: 70)-A (herein referred to as BCY15376).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 4 amino acids and the other of which consists of 8 amino acids, the molecular scaffold is TATA, the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY15300 A-(SEQ ID NO: 3)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15300);
  • A-(SEQ ID NO: 5)-A-[Sar 6 ]-[KFI] herein referred to as BCY15302
  • A-(SEQ ID NO: 70)-A-[Sar 6 ]-[KFI] herein referred to as BCY15330
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 5 amino acids and the other of which consists of 3 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 5 amino acids and the other of which consists of 3 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is: CiFDDWTCiYIQMCiii (SEQ ID NO: 115); wherein C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 5 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is:
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 3 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 3 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiTLMDPWCiiLLKCiii (SEQ ID NO: 71);
  • CiKIHDWTCiiLLRCiii (SEQ ID NO: 72);
  • CilPLDWTCiiMIACiii (SEQ ID NO: 79; herein referred to as BCY18707 when complexed with TATB); wherein C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 3 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiTLMDPWCiiLLKCiii (SEQ ID NO: 71);
  • CiKIHDWTCiiLLRCiii SEQ ID NO: 72
  • CilPLDWTCiiMIACiii SEQ ID NO: 79
  • Q, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TATA
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • BCY15377 A-(SEQ ID NO: 71)-A (herein referred to as BCY15377); and A-(SEQ ID NO: 72)-A (herein referred to as BCY15378).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 3 amino acids, the molecular scaffold is TATA, the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is:
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TATB
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 79)-A (herein referred to as BCY15446);
  • BCY16994 A-(SEQ ID NO: 79)-AK (herein referred to as BCY16994); and Ac-(SEQ ID NO: 79)-K (herein referred to as BCY18654).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TATB
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 79)-A (herein referred to as BCY15446); and A-(SEQ ID NO: 79)-AK (herein referred to as BCY16994).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 4 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 4 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiEYQGPHCiYRLYCiii SEQ ID NO: 11
  • CiEYNGPYCiYRLYCiii SEQ ID NO: 132
  • CiEYVGPMCiYRLYCiii SEQ ID NO: 133
  • C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 4 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is:
  • CiEYQGPHCiiYRLYCiii (SEQ ID NO: 11); wherein C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 4 amino acids
  • the molecular scaffold is TATA
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • BCY15240 A-(SEQ ID NO: 11)-A (herein referred to as BCY15240);
  • BCY17547 A-(SEQ ID NO: 132)-A (herein referred to as BCY17547); and A-(SEQ ID NO: 133)-A (herein referred to as BCY17548).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 4 amino acids, the molecular scaffold is TATA, the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is:
  • BCY15240 A-(SEQ ID NO: 11)-A (herein referred to as BCY15240).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 6 amino acids and the other of which consists of 4 amino acids, the molecular scaffold is TATA, the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is:
  • BCY15304 A-(SEQ ID NO: 11)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15304).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 2 amino acids. In a further embodiment, said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 2 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiEDHDWVYCiiSTCiii SEQ ID NO: 2
  • CiLTPEDIWCiiMLCiii SEQ ID NO: 25
  • CiENPVDIWCiiVLCiii SEQ ID NO: 28
  • CiVFTTVWDCiiLACiii SEQ ID NO: 46
  • CiYDPIDVWCiiMMCiii SEQ ID NO: 51;
  • CiDLTQHWTCiilLCiii SEQ ID NO: 53;
  • CiS E I S DVWCiiM LCiii SEQ ID NO: 54;
  • CiPTPVDIWCiiMLCiii SEQ ID NO: 55;
  • CiEQNGWIYCiiSTCiii SEQ ID NO: 73
  • CiTDRSWI FCiiSTCiii (SEQ ID NO: 74);
  • CiPNISWIYCiiSTCiii SEQ ID NO: 75
  • CiDVCiiGLNAFNRCiii (SEQ ID NO: 117);
  • CiLDETWIYCiiSTCiii SEQ ID NO: 134
  • CiPDETWVYCiiSTCiii SEQ ID NO: 135)
  • CiESNDWVYCiiSTCiii SEQ ID NO: 136
  • CiEDNDWVYCiiSTCiii SEQ ID NO: 137
  • CiPDVSWIYCiiSTCiii (SEQ ID NO: 138); wherein C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 2 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiEDHDWVYCiiSTCiii SEQ ID NO: 2
  • CiLTPEDIWCiiMLCiii SEQ ID NO: 25
  • CiENPVDIWCiiVLCiii SEQ ID NO: 28
  • CiVFTTVWDCiiLACiii SEQ ID NO: 46
  • CiYDPIDVWCiiMMCiii SEQ ID NO: 51
  • CASYDDFWCiiVLCiii SEQ ID NO: 52
  • CiDLTQHWTCiilLCiii SEQ ID NO: 53;
  • CiSEISDVWCiiMLCiii SEQ ID NO: 54
  • CiPTPVDIWCiiMLCiii SEQ ID NO: 55;
  • CiEQNGWIYCiiSTCiii SEQ ID NO: 73
  • CiTDRSWI FCiiSTCiii (SEQ ID NO: 74);
  • CiPNISWIYCiiSTCiii SEQ ID NO: 75
  • CiDVCiiGLNAFNRCiii SEQ ID NO: 117
  • C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 2 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiEDHDWVYCiiSTCiii SEQ ID NO: 2
  • CiLTPEDIWCiiMLCiii SEQ ID NO: 25
  • CiENPVDIWCiiVLCiii SEQ ID NO: 28
  • CiVFTTVWDCiiLACiii SEQ ID NO: 46
  • CiDLTQHWTCiilLCiii SEQ ID NO: 53;
  • CiSEISDVWCiiMLCiii SEQ ID NO: 54
  • CiPTPVDIWCiiMLCiii SEQ ID NO: 55;
  • CiEQNGWIYCiiSTCiii SEQ ID NO: 73
  • CiTDRSWI FCiiSTCiii SEQ ID NO: 74
  • CiPNISWIYCiiSTCiii SEQ ID NO: 75
  • O, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 2 amino acids
  • the molecular scaffold is TATA
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from: A-(SEQ ID NO: 2)-A (herein referred to as BCY15231);
  • A-(SEQ ID NO: 46)-A (herein referred to as BCY15352);
  • A-(SEQ ID NO: 73)-A (herein referred to as BCY15379);
  • A-(SEQ ID NO: 74)-A (herein referred to as BCY15380);
  • A-(SEQ ID NO: 75)-A (herein referred to as BCY15381);
  • A-(SEQ ID NO: 134)-A (herein referred to as BCY17540);
  • A-(SEQ ID NO: 135)-A (herein referred to as BCY17541);
  • A-(SEQ ID NO: 136)-A (herein referred to as BCY17542);
  • BCY17543 A-(SEQ ID NO: 137)-A (herein referred to as BCY17543); and A-(SEQ ID NO: 138)-A (herein referred to as BCY17544).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 2 amino acids, the molecular scaffold is TATA, the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 2)-A (herein referred to as BCY15231);
  • A-(SEQ ID NO: 46)-A (herein referred to as BCY15352);
  • A-(SEQ ID NO: 73)-A (herein referred to as BCY15379);
  • BCY15380 A-(SEQ ID NO: 74)-A
  • BCY75 A-(SEQ ID NO: 75)-A
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 2 amino acids, the molecular scaffold is TATA, the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 2)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15299); and A-(SEQ ID NO: 74)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15332).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 2 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is:
  • BCY16287 A-(SEQ ID NO: 117)-A-[Sar 6 ]-[KFI] (herein referred to as BCY16287).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 2 amino acids
  • the molecular scaffold is TATB
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • BCY15252 A-(SEQ ID NO: 23)-A (herein referred to as BCY15252);
  • A-(SEQ ID NO: 25)-A (herein referred to as BCY15254);
  • A-(SEQ ID NO: 28)-A (herein referred to as BCY15257);
  • A-(SEQ ID NO: 51)-A (herein referred to as BCY15357);
  • A-(SEQ ID NO: 52)-A (herein referred to as BCY15358);
  • A-(SEQ ID NO: 53)-A (herein referred to as BCY15359);
  • A-(SEQ ID NO: 54)-A (herein referred to as BCY15360); and A-(SEQ ID NO: 55)-A (herein referred to as BCY15361).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 2 amino acids, the molecular scaffold is TATB, the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY15311 A-(SEQ ID NO: 23)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15311);
  • BCY15312 A-(SEQ ID NO: 25)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15312); and A-(SEQ ID NO: 53)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15327).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from: CiASPDNPVCiiRFYCiii (SEQ ID NO: 22; herein referred to as BCY16534 when complexed with TATB);
  • CYNHANPVCiiRYYCiii (SEQ ID NO: 24; herein referred to as BCY16540 when complexed with TATB);
  • CiDLFLHELCiiDMPCiii SEQ ID NO: 27
  • CiNKQNWRYCiYLTCiii SEQ ID NO: 31
  • CiHPWSALFCiiNYPCiii SEQ ID NO: 56
  • CiGILADPFCiiLISCiii SEQ ID NO: 76
  • CANPDNPVCiiRFYCiii (SEQ ID NO: 93);
  • CiRNPDNPVCiiRFYCiii SEQ ID NO: 94
  • CiHNPSNPVCiiRFYCiii SEQ ID NO: 95
  • CiVNKHNPVCiiRFYCiii SEQ ID NO: 96
  • CiVNAENPVCiiRFYCiii (SEQ ID NO: 97);
  • CiQNPGNPVCiiRFYCiii (SEQ ID NO: 98);
  • CiMNPDNPVCiiRFYCiii SEQ ID NO: 99
  • CiNNPANPVCiiRFYCiii SEQ ID NO: 101
  • CiFNIDNPVCiiRFYCiii SEQ ID NO: 102
  • CiSNPENPVCiiRFYCiii (SEQ ID NO: 103);
  • CiMNEDNPVCiiRFYCiii SEQ ID NO: 104
  • CiMNEANPVCiiRFYCiii (SEQ ID NO: 105);
  • CiHNLDNPVCiiRFYCiii SEQ ID NO: 106
  • CiKNYDNPVCiiRFYCiii SEQ ID NO: 108
  • CiENMDNPVCiiRFYCiii (SEQ ID NO: 109);
  • CiMNTDNPVCiiRFYCiii SEQ ID NO: 110
  • CiLNVDNPVCiiRFYCiii (SEQ ID NO: 111);
  • CiLNPDNPVCiiRFYCiii SEQ ID NO: 112
  • CiMNPFFYDCiiERTCiii (SEQ ID NO: 116); Ci[Aib]SPDNPVCiiRFYCiii (SEQ ID NO: 139);
  • CiAS[HyP]DNPVCiiRFYCiii SEQ ID NO: 140;
  • Ci[Aib]SPDNPVCiiR[4FPhe]YCiii SEQ ID NO: 160;
  • Ci[Aib]NPDNPVCiiR[4FPhe]YCiii SEQ ID NO: 164
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiASPDNPVCiiRFYCiii SEQ ID NO: 22; herein referred to as BCY16534 when complexed with TATB
  • CYNHANPVCiiRYYCiii (SEQ ID NO: 24; herein referred to as BCY16540 when complexed with TATB);
  • CiDLFLHELCiiDMPCiii SEQ ID NO: 27
  • CiNKQNWRYCiYLTCiii SEQ ID NO: 31
  • CiHPWSALFCiiNYPCiii SEQ ID NO: 56
  • CiGILADPFCiiLISCiii SEQ ID NO: 76
  • CiCASPDNPVCii[HArg]FYCiii (SEQ ID NO: 92);
  • CANPDNPVCiiRFYCiii (SEQ ID NO: 93);
  • CiRNPDNPVCiiRFYCiii SEQ ID NO: 94
  • CiHNPSNPVCiiRFYCiii SEQ ID NO: 95
  • CiVNKHNPVCiiRFYCiii SEQ ID NO: 96
  • CiVNAENPVCiiRFYCiii (SEQ ID NO: 97);
  • CiQNPGNPVCiiRFYCiii (SEQ ID NO: 98);
  • CiMNPDNPVCiiRFYCiii SEQ ID NO: 99
  • CiNNPANPVCiiRFYCiii SEQ ID NO: 101
  • CiFNIDNPVCiiRFYCiii SEQ ID NO: 102
  • CiSNPENPVCiiRFYCiii (SEQ ID NO: 103);
  • CiMNEDNPVCiiRFYCiii SEQ ID NO: 104
  • CiMNEANPVCiiRFYCiii (SEQ ID NO: 105);
  • CiHNLDNPVCiiRFYCiii SEQ ID NO: 106
  • CiKNYDNPVCiiRFYCiii SEQ ID NO: 108
  • CiENMDNPVCiiRFYCiii SEQ ID NO: 109
  • CiMNTDNPVCiiRFYCiii SEQ ID NO: 110
  • CiLNVDNPVCiiRFYCiii (SEQ ID NO: 111);
  • CiLNPDNPVCiiRFYCiii SEQ ID NO: 112
  • CYNHANPVCii[Arg(Me)]YYCiii (SEQ ID NO: 114); and CiMNPFFYDCiiERTCiii (SEQ ID NO: 116); wherein C,, C M and C represent first, second and third cysteine residues, respectively, Agb represents 2-amino-4-guanidinobutyric acid, Arg(Me) represents 5-N methyl arginine, HArg represents homoarginine, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiASPDNPVCiiRFYCiii SEQ ID NO: 22; herein referred to as BCY16534 when complexed with TATB
  • CYNHANPVCiiRYYCiii (SEQ ID NO: 24; herein referred to as BCY16540 when complexed with TATB);
  • CiDLFLHELCiiDMPCiii SEQ ID NO: 27
  • CiNKQNWRYCiYLTCiii SEQ ID NO: 31
  • CiHPWSALFCiiNYPCiii SEQ ID NO: 56
  • CiGILADPFCiiLISCiii SEQ ID NO: 76
  • CiCASPDNPVCii[HArg]FYCiii (SEQ ID NO: 92);
  • CANPDNPVCiiRFYCiii (SEQ ID NO: 93);
  • CiRNPDNPVCiiRFYCiii SEQ ID NO: 94
  • CiHNPSNPVCiiRFYCiii SEQ ID NO: 95
  • CiVNKHNPVCiiRFYCiii SEQ ID NO: 96
  • CiVNAENPVCiiRFYCiii (SEQ ID NO: 97);
  • CiQNPGNPVCiiRFYCiii (SEQ ID NO: 98);
  • CiMNPDNPVCiiRFYCiii SEQ ID NO: 99
  • CYNQENPVCiiRFYCiii (SEQ ID NO: 100); CiNNPANPVCiiRFYCiii (SEQ ID NO: 101);
  • CiFNIDNPVCiiRFYCiii SEQ ID NO: 102
  • CiSNPENPVCiiRFYCiii (SEQ ID NO: 103);
  • CiMNEDNPVCiiRFYCiii SEQ ID NO: 104
  • CiMNEANPVCiiRFYCiii (SEQ ID NO: 105);
  • CiHNLDNPVCiiRFYCiii SEQ ID NO: 106
  • CiKNYDNPVCiiRFYCiii SEQ ID NO: 108
  • CiENMDNPVCiiRFYCiii (SEQ ID NO: 109);
  • CiMNTDNPVCiiRFYCiii SEQ ID NO: 110
  • CiLNVDNPVCiiRFYCiii (SEQ ID NO: 111);
  • CiLNPDNPVCiiRFYCiii SEQ ID NO: 112
  • CYNHANPVCii[Arg(Me)]YYCiii (SEQ ID NO: 114); wherein C,, C M and C represent first, second and third cysteine residues, respectively, Agb represents 2-amino-4-guanidinobutyric acid, Arg(Me) represents 5-N methyl arginine, HArg represents homoarginine, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TATB
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • BCY15251 A-(SEQ ID NO: 22)-A (herein referred to as BCY15251);
  • BCY16538 Ac-A-(SEQ ID NO: 22)-A
  • BCY15576 Ac-(SEQ ID NO: 22) (herein referred to as BCY15576);
  • BCY16545 Ac-A-(SEQ ID NO: 24)-A
  • BCY16544 Ac-(SEQ ID NO: 24) (herein referred to as BCY16544);
  • A-(SEQ ID NO: 24)-A (herein referred to as BCY15522);
  • A-(SEQ ID NO: 27)-A (herein referred to as BCY15256);
  • A-(SEQ ID NO: 56)-A (herein referred to as BCY15362);
  • A-(SEQ ID NO: 57)-A (herein referred to as BCY15363);
  • A-(SEQ ID NO: 89)-A (herein referred to as BCY16541);
  • A-(SEQ ID NO: 90)-A (herein referred to as BCY16535);
  • BCY16536 A-(SEQ ID NO: 91)-A (herein referred to as BCY16536);
  • A-(SEQ ID NO: 92)-A (herein referred to as BCY16537); Ac-(SEQ ID NO: 93) (herein referred to as BCY16903); Ac-(SEQ ID NO: 94) (herein referred to as BCY16905); Ac-(SEQ ID NO: 95) (herein referred to as BCY16906); Ac-(SEQ ID NO: 96) (herein referred to as BCY16911); Ac-(SEQ ID NO: 97) (herein referred to as BCY16913); Ac-(SEQ ID NO: 98) (herein referred to as BCY16915); Ac-(SEQ ID NO: 99) (herein referred to as BCY16917); Ac-(SEQ ID NO: 100) (herein referred to as BCY16918); Ac-(SEQ ID NO: 101) (herein referred to as BCY16921); Ac-(SEQ ID NO: 102) (herein referred to as BCY16912); Ac-(S
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TATB
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • BCY15251 A-(SEQ ID NO: 22)-A (herein referred to as BCY15251);
  • BCY16538 Ac-A-(SEQ ID NO: 22)-A
  • BCY15576 Ac-(SEQ ID NO: 22) (herein referred to as BCY15576);
  • BCY16545 Ac-A-(SEQ ID NO: 24)-A
  • BCY16544 Ac-(SEQ ID NO: 24) (herein referred to as BCY16544);
  • A-(SEQ ID NO: 24)-A (herein referred to as BCY15522);
  • A-(SEQ ID NO: 27)-A (herein referred to as BCY15256);
  • A-(SEQ ID NO: 56)-A (herein referred to as BCY15362);
  • A-(SEQ ID NO: 57)-A (herein referred to as BCY15363);
  • A-(SEQ ID NO: 89)-A (herein referred to as BCY16541);
  • A-(SEQ ID NO: 90)-A (herein referred to as BCY16535);
  • BCY16536 A-(SEQ ID NO: 91)-A (herein referred to as BCY16536);
  • A-(SEQ ID NO: 92)-A (herein referred to as BCY16537);
  • BCY16905 Ac-(SEQ ID NO: 94) (herein referred to as BCY16905); Ac-(SEQ ID NO: 95) (herein referred to as BCY16906);
  • BCY16917 Ac-(SEQ ID NO: 99) (herein referred to as BCY16917);
  • BCY16921 Ac-(SEQ ID NO: 101) (herein referred to as BCY16921);
  • BCY16914 Ac-(SEQ ID NO: 103) (herein referred to as BCY16914);
  • BCY16920 Ac-(SEQ ID NO: 106) (herein referred to as BCY16920);
  • BCY16543 A-(SEQ ID NO: 113)-A
  • BCY16542 A-(SEQ ID NO: 114)-A
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TATB
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY15328 A-(SEQ ID NO: 56)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15328); and A-(SEQ ID NO: 116)-A-[Sar 6 ]-[KFI] (herein referred to as BCY16298).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TATB
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from: A-(SEQ ID NO: 22)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15310);
  • BCY15313 A-(SEQ ID NO: 27)-A-[Sar 6 ]-[KFI]
  • BCY15328 A-(SEQ ID NO: 56)-A-[Sar 6 ]-[KFI]
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is:
  • A-(SEQ ID NO: 31)-A (herein referred to as BCY15315).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is:
  • BCY15313 A-(SEC ID NO: 31)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15313).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TATA
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is:
  • A-(SEC ID NO: 76)-A (herein referred to as BCY15382).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 3 amino acids, the molecular scaffold is TATA, the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is:
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 5 amino acids. In a further embodiment, said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 5 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiTTSEKVKCiiLQRHPCiii SEQ ID NO: 32
  • CiQPDMRIKCiiLQRVACiii SEQ ID NO: 33;
  • CiSSN N Rl KCiiLQRVTCiii (SEQ ID NO: 34);
  • CiKEKTTIGCiiLMAGICiii SEQ ID NO: 35
  • CiNRPTSVYCiiLQRGICiii SEQ ID NO: 166
  • C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 5 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiTTSEKVKCiiLQRHPCiii SEQ ID NO: 32
  • CiQPDMRIKCiiLQRVACiii SEQ ID NO: 33;
  • CiSSN NRI KCiiLQRVTCiii SEQ ID NO: 34
  • CiKEKTTIGCiiLMAGICiii SEQ ID NO: 35
  • O, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 5 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 32)-A (herein referred to as BCY15338);
  • A-(SEQ ID NO: 33)-A (herein referred to as BCY15339);
  • BCY15340 A-(SEQ ID NO: 34)-A (herein referred to as BCY15340);
  • A-(SEQ ID NO: 35)-A (herein referred to as BCY15341); and A-(SEQ ID NO: 166)-A (herein referred to as BCY17359).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 5 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 32)-A (herein referred to as BCY15338);
  • A-(SEQ ID NO: 33)-A (herein referred to as BCY15339);
  • BCY15340 A-(SEQ ID NO: 34)-A
  • BCY35 A-(SEQ ID NO: 35)-A
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 7 amino acids and the other of which consists of 5 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY15316 A-(SEQ ID NO: 32)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15316); and A-(SEQ ID NO: 33)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15317).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiGRDSSWIYCiiSTCiii SEQ ID NO: 12
  • CiRGTPAWKACiAICiii SEQ ID NO: 13
  • CiPFPSGFGTCiiTFCiii SEQ ID NO: 36
  • CiPYVAGRGTCiiLLCiii (SEQ ID NO: 37; herein referred to as BCY16312 when complexed with TCMT);
  • CiPYPRGTGSCiTFCiii SEQ ID NO: 38
  • CiLYPPGKGTCiiLLCiii SEQ ID NO: 39
  • CiPSPAGRGTCiiLLCiii SEQ ID NO: 40
  • CiPATIGRGPCiiTFCiii SEQ ID NO: 41
  • CiPEANSWVYCiiSTCiii SEQ ID NO: 77
  • CiPYVAGRGTCiiL[Cba]Ciii (SEQ ID NO: 82);
  • CiPYVAGRGTCii[Cba]LCiii (SEQ ID NO: 83);
  • CiPYVAGR[dA]TCiiLLCiii (SEQ ID NO: 84);
  • CiPYVAG[HArg]GTCiiLLCiii SEQ ID NO: 85
  • CiPYVAGRGTCiiL[tBuAla]Ciii (SEQ ID NO: 86);
  • CiPYVAGRGTCii[tBuAla]LCiii (SEQ ID NO: 87); CiPYVAG[Agb][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 88);
  • CiPYVAG[HArg][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 167; herein referred to as BCY18111 when complexed with TCMT);
  • CiPYVAG[Agb][dA]TCiiLLCiii (SEQ ID NO: 172); CiPYVAG[Agb]GTCiiL[tBuAla]Ciii (SEQ ID NO: 173); CiPYV[HyP]G[HArg][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 174); CiPY[K(PYA)]AG[HArg][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 175); Ci[Oic]YVAG[HArg][dA]TCiiL[tBuAla]Ciiii (SEQ ID NO: 176); CiPY[B-Melle]AG[HArg][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 177); CiPY[tBuGly]AG[HArg][dA]TCiiL[tBu
  • CiPYAPGNGTCiiLLCiii (SEQ ID NO: 189);
  • CiPHPPGRGTCiiLLCiii (SEQ ID NO: 190);
  • CiPYNAGTGTCiiLLCiii SEQ ID NO: 191;
  • CiPYSPGQGTCiiLLCiii (SEQ ID NO: 192);
  • CiPYQPGSGTCiiLLCiii (SEQ ID NO: 193); CiPFPPGMGTCiiLLCiii (SEQ ID NO: 194);
  • CiPHQPGFGTCiiLLCiii (SEQ ID NO: 195);
  • CiPYSPGSGTCiiLLCiii (SEQ ID NO: 196);
  • CiPYLAGTGTCiiLLCiii (SEQ ID NO: 197);
  • CiPWEAGKGTCiiLLCiii SEQ ID NO: 198
  • CiPYAPGMGTCiiLLCiii (SEQ ID NO: 199);
  • CiPHMPGSGTCiiLLCiii SEQ ID NO: 200
  • CiPYN KGEGTCiiLLCiii SEQ ID NO: 201
  • CiPFKPGVGTCiiLLCiii (SEQ ID NO: 202);
  • CiP[4tBuPhe]VAG[Orn][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 203);
  • Ci[Oic][4tBuPhe]VAG[HArg][dA]TCiiL[tBuAla]Ciii SEQ ID NO: 204
  • CiP[4tBuPhe]VAG[Dab][dA]TCiiL[tBuAla]Ciii SEQ ID NO: 205
  • CiP[4tBuPhe]VAG[Dap][dA]TCiiL[tBuAla]Ciii SEQ ID NO: 206
  • CiP[4CF3Phe]VAG[HArg][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 207);
  • CiP[DMAPhe]VAG[HArg][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 208);
  • CiP[4tBuPhe]VAG[HSer][dA]TCiiL[tBuAla]Ciii SEQ ID NO: 210
  • CiP[4tBuPhe]VAG[Cit][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 211);
  • Ci[Oic][4tBuPhe]VAG[Cit][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 214); wherein C,, C M and C represent first, second and third cysteine residues, respectively, Agb represents 2-amino-4-guanidinobutyric acid, Arg(Me) represents d-N methyl arginine, B- Melle represents b-methyl-isoleucine, 44BPA represents 4,4-biphenylalanine, Cba represents b-cyclobutylalanine, 4CF3Phe represents 4-trifluoromethyl-phenylalanine, Cit represents citrulline, Dab represents dia inobutanoic acid, Dap represents diaminopropionic acid, DMAPhe represents 4-Dimethylamino- phenylalanine, 55DMP represents 5,5- Dimethyl-L-proline, 2FPhe represents 2-fluoro-phenylalanine, 3FPhe represents 3-flu
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiGRDSSWIYCiiSTCiii SEQ ID NO: 12
  • CiRGTPAWKACiiAICiii SEQ ID NO: 13
  • CiPFPSGFGTCiiTFCiii SEQ ID NO: 36
  • CiPYVAGRGTCiiLLCiii (SEQ ID NO: 37; herein referred to as BCY16312 when complexed with TCMT);
  • CiPYPRGTGSCiiTFCiii SEQ ID NO: 38
  • CiLYPPGKGTCiiLLCiii SEQ ID NO: 39
  • CiPSPAGRGTCiiLLCiii SEQ ID NO: 40
  • CiPATIGRGPCiiTFCiii SEQ ID NO: 41
  • CiPEANSWVYCiiSTCiii SEQ ID NO: 77
  • CiPYVAG[Agb]GTCiiLLCiii SEQ ID NO: 80;
  • CiPYVAG[Arg(Me)]GTCiiLLCiii SEQ ID NO: 81
  • CiPYVAGRGTCiiL[Cba]Ciii (SEQ ID NO: 82);
  • CiPYVAGRGTCii[Cba]LCiii (SEQ ID NO: 83);
  • CiPYVAGR[dA]TCiiLLCiii (SEQ ID NO: 84);
  • CiPYVAG[HArg]GTCiiLLCiii SEQ ID NO: 85
  • CiPYVAGRGTCiiL[tBuAla]Ciii (SEQ ID NO: 86);
  • CiPYVAGRGTCii[tBuAla]LCiii (SEQ ID NO: 87);
  • CiPYVAG[Agb][dA]TCiiL[tBuAla]Ciii (SEQ ID NO: 88); wherein C,, C M and C represent first, second and third cysteine residues, respectively, Agb represents 2-amino-4-guanidinobutyric acid, Arg(Me) represents 5-N methyl arginine, Cba represents b-cyclobutylalanine, HArg represents homoarginine, tBuAla represents t-butyl- alanine, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids
  • the molecular scaffold is TATA
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 12)-A (herein referred to as BCY15241);
  • BCY15242 A-(SEQ ID NO: 13)-A (herein referred to as BCY15242);
  • A-(SEQ ID NO: 77)-A (herein referred to as BCY15383);
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids, the molecular scaffold is TATA, the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY15305 A-(SEQ ID NO: 12)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15305);
  • BCY15306 A-(SEQ ID NO: 13)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15306.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 36)-A (herein referred to as BCY15342);
  • A-(SEQ ID NO: 37)-A (herein referred to as BCY15343);
  • BCY16322 Ac-A-(SEQ ID NO: 37)-A
  • BCY16926 Ac-(SEQ ID NO: 37) (herein referred to as BCY16926);
  • A-(SEQ ID NO: 38)-A (herein referred to as BCY15344);
  • A-(SEQ ID NO: 39)-A (herein referred to as BCY15345);
  • A-(SEQ ID NO: 40)-A (herein referred to as BCY15346);
  • A-(SEQ ID NO: 41)-A (herein referred to as BCY15347);
  • A-(SEQ ID NO: 80)-A (herein referred to as BCY16313);
  • BCY18086 Ac-(SEQ ID NO: 80) (herein referred to as BCY18086);
  • BCY163114 A-(SEQ ID NO: 81)-A (herein referred to as BCY16314);
  • A-(SEQ ID NO: 82)-A (herein referred to as BCY16315);
  • A-(SEQ ID NO: 83)-A (herein referred to as BCY16316);
  • A-(SEQ ID NO: 84)-A (herein referred to as BCY16318);
  • A-(SEQ ID NO: 85)-A (herein referred to as BCY16319);
  • A-(SEQ ID NO: 86)-A (herein referred to as BCY16320);
  • BCY16321 A-(SEQ ID NO: 87)-A (herein referred to as BCY16321);
  • BCY18024 Ac-(SEQ ID NO: 167)
  • BCY18026 Ac-(SEQ ID NO: 169) (herein referred to as BCY18026);
  • BCY18027 Ac-(SEQ ID NO: 170)-[K(PYA)] (herein referred to as BCY18027); Ac-(SEQ ID NO: 171)-[K(PYA)] (herein referred to as BCY18040);
  • BCY18087 Ac-(SEQ ID NO: 172) (herein referred to as BCY18087);
  • BCY18088 Ac-(SEQ ID NO: 173)
  • BCY18110 Ac-(SEQ ID NO: 175) (herein referred to as BCY18110);
  • BCY18524 Ac-(SEQ ID NO: 180)-[K(PYA)]
  • BCY18527 Ac-(SEQ ID NO: 181)-[K(PYA)]
  • BCY18529 Ac-(SEQ ID NO: 182)-[K(PYA)]
  • BCY18661 Ac-(SEQ ID NO: 183)-[K(PYA)]
  • BCY18662 Ac-(SEQ ID NO: 184)-[K(PYA)]
  • BCY19305 Ac-(SEQ ID NO: 185) (herein referred to as BCY19305);
  • BCY19533 Ac-(SEQ ID NO: 188) (herein referred to as BCY19533);
  • BCY19534 Ac-(SEQ ID NO: 189) (herein referred to as BCY19534);
  • BCY19535 Ac-(SEQ ID NO: 190) (herein referred to as BCY19535);
  • BCY19536 Ac-(SEQ ID NO: 191) (herein referred to as BCY19536);
  • BCY19537 Ac-(SEQ ID NO: 192) (herein referred to as BCY19537);
  • BCY19538 Ac-(SEQ ID NO: 193) (herein referred to as BCY19538);
  • BCY19539 Ac-(SEQ ID NO: 194) (herein referred to as BCY19539);
  • BCY19541 Ac-(SEQ ID NO: 195) (herein referred to as BCY19541);
  • BCY19542 Ac-(SEQ ID NO: 196) (herein referred to as BCY19542);
  • BCY19543 Ac-(SEQ ID NO: 197)
  • BCY19544 Ac-(SEQ ID NO: 198) (herein referred to as BCY19544);
  • BCY19545 Ac-(SEQ ID NO: 199) (herein referred to as BCY19545);
  • BCY19546 Ac-(SEQ ID NO: 200) (herein referred to as BCY19546);
  • BCY19547 Ac-(SEQ ID NO: 201) (herein referred to as BCY19547);
  • BCY19548 Ac-(SEQ ID NO: 202) (herein referred to as BCY19548);
  • BCY20014 Ac-(SEQ ID NO: 204)-[K(PYA)]-triazolyl-PEG 10 -amido-PIB (herein referred to as BCY20014); Ac-(SEQ ID NO: 205)-[K(PYA)] (herein referred to as BCY19638);
  • BCY19654 Ac-(SEQ ID NO: 209)-[K(PYA)]
  • BCY19658 Ac-(SEQ ID NO: 211)-[K(PYA)]
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • A-(SEQ ID NO: 36)-A (herein referred to as BCY15342);
  • A-(SEQ ID NO: 37)-A (herein referred to as BCY15343);
  • BCY16322 Ac-A-(SEQ ID NO: 37)-A
  • BCY16926 Ac-(SEQ ID NO: 37) (herein referred to as BCY16926);
  • A-(SEQ ID NO: 38)-A (herein referred to as BCY15344);
  • A-(SEQ ID NO: 39)-A (herein referred to as BCY15345);
  • A-(SEQ ID NO: 40)-A (herein referred to as BCY15346);
  • A-(SEQ ID NO: 41)-A (herein referred to as BCY15347);
  • A-(SEQ ID NO: 80)-A (herein referred to as BCY16313);
  • BCY163114 A-(SEQ ID NO: 81)-A (herein referred to as BCY16314);
  • A-(SEQ ID NO: 82)-A (herein referred to as BCY16315);
  • A-(SEQ ID NO: 83)-A (herein referred to as BCY16316);
  • A-(SEQ ID NO: 84)-A (herein referred to as BCY16318);
  • A-(SEQ ID NO: 85)-A (herein referred to as BCY16319);
  • A-(SEQ ID NO: 86)-A (herein referred to as BCY16320);
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids, the molecular scaffold is TCMT, the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY16323 Ac-(SEQ ID NO: 37)-[Sar 6 ]-[KFI]
  • BCY15319 A-(SEQ ID NO: 38)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15319); and Ac-(SEQ ID NO: 88)-A-[Sar 6 ]-[KFI] (herein referred to as BCY16679).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY15319 A-(SEQ ID NO: 38)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15319); and Ac-(SEQ ID NO: 88)-A-[Sar 6 ]-[KFI] (herein referred to as BCY16679).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY15318 A-(SEQ ID NO: 37)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15318); and A-(SEQ ID NO: 38)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15319).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 3 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 3 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiSNTWHWTDCiiLAECiii SEQ ID NO: 45
  • CiNLWNGDPWCiiLLRCiii SEQ ID NO: 47
  • C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TATA
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • BCY15351 A-(SEC ID NO: 45)-A
  • BCY15353 A-(SEC ID NO: 47)-A
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 3 amino acids
  • the molecular scaffold is TATA
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY15322 A-(SEC ID NO: 45)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15322); and A-(SEC ID NO: 47)-A-[Sar 6 ]-[KFI] (herein referred to as BCY15323).
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 4 amino acids.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 4 amino acids and the bicyclic peptide ligand comprises an amino acid sequence which is selected from:
  • CiHQLM Dl WDCiiLRPDCiii SEQ ID NO: 42
  • CiLTAREKIQCiiLQRRCiii SEQ ID NO: 43
  • C,, C M and C represent first, second and third cysteine residues, respectively, or a pharmaceutically acceptable salt thereof.
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 4 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide ligand additionally comprises N- and/or C-terminal additions and comprises an amino acid sequence which is selected from:
  • BCY15348 A-(SEQ ID NO: 42)-A
  • BCY15349 A-(SEQ ID NO: 43)-A
  • said loop sequences comprise three reactive groups separated by two loop sequences one of which consists of 8 amino acids and the other of which consists of 2 amino acids
  • the molecular scaffold is TCMT
  • the bicyclic peptide additionally comprises N- and/or C-terminal additions and a labelling moiety, such as fluorescein (FI), and comprises an amino acid sequence which is selected from:
  • BCY15320 A-(SEQ ID NO: 42)-A-[Sar 6 ]-[KFI]
  • BCY15321 A-(SEQ ID NO: 43)-A-[Sar 6 ]-[KFI]
  • the peptide ligand of the invention is selected from BCY15324, BCY16679, BCY15299, BCY15437, BCY15310, BCY16298 and BCY16287. These peptide ligands are believed to bind to 7 different epitopes of the S1 spike protein (referred to internally as Epitopes 1, 2, 3, 4, 5, 9 and 10, respectively). More crucially, the peptide ligands of this embodiment provide the significant advantage of being able to bind to a variety of differing mutant/variants of COVID-19 S1 spike protein as evidenced in the data presented herein as Example 3.
  • cysteine residues (Ci, C M and C m ) are omitted from the numbering as they are invariant, therefore, the numbering of amino acid residues within peptides of the invention is referred to as below:
  • Ci- H i - H 2 -A 3 -Cii- P 4 - 15- L 6 -T 7 -G 8 - W 9 -Ciii SEQ ID NO: 1.
  • All bicyclic peptides are assumed to be cyclised with TATA, TATB or TCMT and yielding a tri-substituted structure. Cyclisation with TATA, TATB or TCMT occurs on the first, second and third reactive groups (i.e. C,, C M , Cm).
  • N- or C-terminal extensions to the bicycle core sequence are added to the left or right side of the sequence, separated by a hyphen.
  • an N-terminal bAIq-BqM 0-Ala tail would be denoted as: bAIq-BqMO-A- ⁇ EO ID NO: X).
  • a peptide ligand refers to a peptide covalently bound to a molecular scaffold.
  • such peptides comprise two or more reactive groups (i.e. cysteine residues) which are capable of forming covalent bonds to the scaffold, and a sequence subtended between said reactive groups which is referred to as the loop sequence, since it forms a loop when the peptide is bound to the scaffold.
  • the peptides comprise at least three cysteine residues (referred to herein as C,, C M and C m ), and form at least two loops on the scaffold.
  • the peptide ligand may additionally comprise a half-life extending moiety in order to extend and improve the half-life of the resultant peptide ligand.
  • a half-life extending moiety is a polyethylene glycol (PEG) moiety, such as triazolyl-PEGio- amido-PIB (wherein PIB represents 4(4-iodophenyl)butyrate).
  • PEG polyethylene glycol
  • BCY20014 is an example of a bicyclic peptide ligand of the invention described herein which contains this half-life extending moiety.
  • Certain bicyclic peptides of the present invention have a number of advantageous properties which enable them to be considered as suitable drug-like molecules for injection, inhalation, nasal, ocular, oral or topical administration.
  • Such advantageous properties include:
  • Certain ligands demonstrate cross-reactivity across Lipid II from different bacterial species and hence are able to treat infections caused by multiple species of bacteria.
  • Other ligands may be highly specific for the Lipid II of certain bacterial species which may be advantageous for treating an infection without collateral damage to the beneficial flora of the patient;
  • Bicyclic peptide ligands should ideally demonstrate stability to plasma proteases, epithelial ("membrane-anchored") proteases, gastric and intestinal proteases, lung surface proteases, intracellular proteases and the like. Protease stability should be maintained between different species such that a bicycle lead candidate can be developed in animal models as well as administered with confidence to humans;
  • Desirable solubility profile This is a function of the proportion of charged and hydrophilic versus hydrophobic residues and intra/inter-molecular H-bonding, which is important for formulation and absorption purposes;
  • An optimal plasma half-life in the circulation Depending upon the clinical indication and treatment regimen, it may be required to develop a bicyclic peptide for short exposure in an acute illness management setting, or develop a bicyclic peptide with enhanced retention in the circulation, and is therefore optimal for the management of more chronic disease states.
  • Other factors driving the desirable plasma half-life are requirements of sustained exposure for maximal therapeutic efficiency versus the accompanying toxicology due to sustained exposure of the agent;
  • salt forms are within the scope of this invention, and references to peptide ligands include the salt forms of said ligands.
  • the salts of the present invention can be synthesized from the parent compound that contains a basic or acidic moiety by conventional chemical methods such as methods described in Pharmaceutical Salts: Properties, Selection, and Use, P. Heinrich Stahl (Editor), Camille G. Wermuth (Editor), ISBN: 3-90639-026-8, Hardcover, 388 pages, August 2002.
  • such salts can be prepared by reacting the free acid or base forms of these compounds with the appropriate base or acid in water or in an organic solvent, or in a mixture of the two.
  • Acid addition salts may be formed with a wide variety of acids, both inorganic and organic.
  • acid addition salts include mono- or di-salts formed with an acid selected from the group consisting of acetic, 2,2-dichloroacetic, adipic, alginic, ascorbic (e.g.
  • D-glucuronic D-glucuronic
  • glutamic e.g. L-glutamic
  • a-oxoglutaric glycolic, hippuric
  • hydrohalic acids e.g. hydrobromic, hydrochloric, hydriodic
  • isethionic lactic (e.g.
  • salts consist of salts formed from acetic, hydrochloric, hydriodic, phosphoric, nitric, sulfuric, citric, lactic, succinic, maleic, malic, isethionic, fumaric, benzenesulfonic, toluenesulfonic, sulfuric, methanesulfonic (mesylate), ethanesulfonic, naphthalenesulfonic, valeric, propanoic, butanoic, malonic, glucuronic and lactobionic acids.
  • One particular salt is the hydrochloride salt.
  • Another particular salt is the acetate salt.
  • a salt may be formed with an organic or inorganic base, generating a suitable cation.
  • suitable inorganic cations include, but are not limited to, alkali metal ions such as Li + , Na + and K + , alkaline earth metal cations such as Ca 2+ and Mg 2+ , and other cations such as Al 3+ or Zn + .
  • Suitable organic cations include, but are not limited to, ammonium ion (i.e., NH4 + ) and substituted ammonium ions (e.g., NHsR + , NH2R2 + , NHR 3 + , NFV).
  • ammonium ion i.e., NH4 +
  • substituted ammonium ions e.g., NHsR + , NH2R2 + , NHR 3 + , NFV.
  • Examples of some suitable substituted ammonium ions are those derived from: methylamine, ethylamine, diethylamine, propylamine, dicyclohexylamine, triethylamine, butylamine, ethylenediamine, ethanolamine, diethanolamine, piperazine, benzylamine, phenylbenzylamine, choline, meglumine, and tromethamine, as well as amino acids, such as lysine and arginine.
  • An example of a common quaternary ammonium ion is N(CH 3 ) 4 + .
  • peptides of the invention contain an amine function
  • these may form quaternary ammonium salts, for example by reaction with an alkylating agent according to methods well known to the skilled person.
  • Such quaternary ammonium compounds are within the scope of the peptides of the invention.
  • modified derivatives of the peptide ligands as defined herein are within the scope of the present invention.
  • suitable modified derivatives include one or more modifications selected from: N-terminal and/or C-terminal modifications; replacement of one or more amino acid residues with one or more non-natural amino acid residues (such as replacement of one or more polar amino acid residues with one or more isosteric or isoelectronic amino acids; replacement of one or more non-polar amino acid residues with other non-natural isosteric or isoelectronic amino acids); addition of a spacer group; replacement of one or more oxidation sensitive amino acid residues with one or more oxidation resistant amino acid residues; replacement of one or more amino acid residues with an alanine, replacement of one or more L-amino acid residues with one or more D- amino acid residues; N-alkylation of one or more amide bonds within the bicyclic peptide ligand; replacement of one or more peptide bonds with a surrogate bond
  • the modified derivative comprises an N-terminal and/or C-terminal modification.
  • the modified derivative comprises an N- terminal modification using suitable amino-reactive chemistry, and/or C-terminal modification using suitable carboxy-reactive chemistry.
  • said N-terminal or C- terminal modification comprises addition of an effector group, including but not limited to a cytotoxic agent, a radiochelator or a chromophore.
  • the modified derivative comprises an N-terminal modification.
  • the N-terminal modification comprises an N-terminal acetyl group.
  • the N-terminal cysteine group (the group referred to herein as C,) is capped with acetic anhydride or other appropriate reagents during peptide synthesis leading to a molecule which is N-terminally acetylated. This embodiment provides the advantage of removing a potential recognition point for aminopeptidases and avoids the potential for degradation of the bicyclic peptide.
  • the N-terminal modification comprises the addition of a molecular spacer group which facilitates the conjugation of effector groups and retention of potency of the bicyclic peptide to its target.
  • the modified derivative comprises a C-terminal modification.
  • the C-terminal modification comprises an amide group.
  • the C-terminal cysteine group (the group referred to herein as C m ) is synthesized as an amide during peptide synthesis leading to a molecule which is C- terminally amidated. This embodiment provides the advantage of removing a potential recognition point for carboxypeptidase and reduces the potential for proteolytic degradation of the bicyclic peptide.
  • the modified derivative comprises replacement of one or more amino acid residues with one or more non-natural amino acid residues.
  • non natural amino acids may be selected having isosteric/isoelectronic side chains which are neither recognised by degradative proteases nor have any adverse effect upon target potency.
  • non-natural amino acids may be used having constrained amino acid side chains, such that proteolytic hydrolysis of the nearby peptide bond is conformationally and sterically impeded.
  • these concern proline analogues, bulky sidechains, Ca- disubstituted derivatives (for example, aminoisobutyric acid, Aib), and cyclo amino acids, a simple derivative being amino-cyclopropylcarboxylic acid.
  • the modified derivative comprises the addition of a spacer group.
  • the modified derivative comprises the addition of a spacer group to the N-terminal cysteine (C,) and/or the C-terminal cysteine (C m ).
  • the modified derivative comprises replacement of one or more oxidation sensitive amino acid residues with one or more oxidation resistant amino acid residues.
  • the modified derivative comprises replacement of one or more charged amino acid residues with one or more hydrophobic amino acid residues. In an alternative embodiment, the modified derivative comprises replacement of one or more hydrophobic amino acid residues with one or more charged amino acid residues.
  • the correct balance of charged versus hydrophobic amino acid residues is an important characteristic of the bicyclic peptide ligands. For example, hydrophobic amino acid residues influence the degree of plasma protein binding and thus the concentration of the free available fraction in plasma, while charged amino acid residues (in particular arginine) may influence the interaction of the peptide with the phospholipid membranes on cell surfaces. The two in combination may influence half-life, volume of distribution and exposure of the peptide drug, and can be tailored according to the clinical endpoint. In addition, the correct combination and number of charged versus hydrophobic amino acid residues may reduce irritation at the injection site (if the peptide drug has been administered subcutaneously).
  • the modified derivative comprises replacement of one or more L-amino acid residues with one or more D-amino acid residues.
  • This embodiment is believed to increase proteolytic stability by steric hindrance and by a propensity of D-amino acids to stabilise b-turn conformations (Tugyi et a/ (2005) PNAS, 102(2), 413-418).
  • the modified derivative comprises removal of any amino acid residues and substitution with alanines. This embodiment provides the advantage of removing potential proteolytic attack site(s).
  • the present invention includes all pharmaceutically acceptable (radio)isotope-labeled peptide ligands of the invention, wherein one or more atoms are replaced by atoms having the same atomic number, but an atomic mass or mass number different from the atomic mass or mass number usually found in nature, and peptide ligands of the invention, wherein metal chelating groups are attached (termed “effector”) that are capable of holding relevant (radio)isotopes, and peptide ligands of the invention, wherein certain functional groups are covalently replaced with relevant (radio)isotopes or isotopically labelled functional groups.
  • isotopes suitable for inclusion in the peptide ligands of the invention comprise isotopes of hydrogen, such as 2 H (D) and 3 H (T), carbon, such as 11 C, 13 C and 14 C, chlorine, such as 36 CI, fluorine, such as 18 F, iodine, such as 123 l, 125 l and 131 l, nitrogen, such as 13 N and 15 N, oxygen, such as 15 0, 17 0 and 18 0, phosphorus, such as 32 P, sulfur, such as 35 S, copper, such as 64 Cu, gallium, such as 67 Ga or 68 Ga, yttrium, such as 90 Y and lutetium, such as 177 Lu, and Bismuth, such as 213 Bi.
  • hydrogen such as 2 H (D) and 3 H (T)
  • carbon such as 11 C, 13 C and 14 C
  • chlorine such as 36 CI
  • fluorine such as 18 F
  • iodine such as 123 l, 125 l and 131
  • Certain isotopically-labelled peptide ligands of the invention are useful in drug and/or substrate tissue distribution studies.
  • the peptide ligands of the invention can further have valuable diagnostic properties in that they can be used for detecting or identifying the formation of a complex between a labelled compound and other molecules, peptides, proteins, enzymes or receptors.
  • the detecting or identifying methods can use compounds that are labelled with labelling agents such as radioisotopes, enzymes, fluorescent substances, luminous substances (for example, luminol, luminol derivatives, luciferin, aequorin and luciferase), etc.
  • the radioactive isotopes tritium, i.e. 3 H (T), and carbon-14, i.e. 14 C, are particularly useful for this purpose in view of their ease of incorporation and ready means of detection.
  • Substitution with heavier isotopes such as deuterium, i.e. 2 H (D), may afford certain therapeutic advantages resulting from greater metabolic stability, for example, increased in vivo half-life or reduced dosage requirements, and hence may be preferred in some circumstances.
  • Isotopically-labeled compounds of peptide ligands of the invention can generally be prepared by conventional techniques known to those skilled in the art or by processes analogous to those described in the accompanying Examples using an appropriate isotopically-labeled reagent in place of the non-labeled reagent previously employed.
  • the molecular scaffold may be a small molecule, such as a small organic molecule.
  • the molecular scaffold may be a macromolecule. In one embodiment the molecular scaffold is a macromolecule composed of amino acids, nucleotides or carbohydrates.
  • the molecular scaffold comprises reactive groups that are capable of reacting with functional group(s) of the polypeptide to form covalent bonds.
  • the molecular scaffold may comprise chemical groups which form the linkage with a peptide, such as amines, thiols, alcohols, ketones, aldehydes, nitriles, carboxylic acids, esters, alkenes, alkynes, azides, anhydrides, succinimides, maleimides, alkyl halides and acyl halides.
  • the molecular scaffold of the invention contains chemical groups that allow functional groups of the polypeptide of the encoded library of the invention to form covalent links with the molecular scaffold.
  • Said chemical groups are selected from a wide range of functionalities including amines, thiols, alcohols, ketones, aldehydes, nitriles, carboxylic acids, esters, alkenes, alkynes, anhydrides, succinimides, maleimides, azides, alkyl halides and acyl halides.
  • Scaffold reactive groups that could be used on the molecular scaffold to react with thiol groups of cysteines are alkyl halides (or also named halogenoalkanes or haloalkanes).
  • scaffold reactive groups that are used to selectively couple compounds to cysteines in proteins are maleimides, ab unsaturated carbonyl containing compounds and a-halomethylcarbonyl containing compounds.
  • maleimides which may be used as molecular scaffolds in the invention include: tris-(2-maleimidoethyl)amine, tris-(2-maleimidoethyl)benzene, tris- (maleimido)benzene.
  • the molecular scaffold is selected from 1,T,1"-(1,3,5-triazinane-1,3,5- triyl)triprop-2-en-1-one (also known as triacryloylhexahydro-s-triazine; TATA), 1,3,5- tris(bromoacetyl) hexahydro-1,3,5-triazine (TATB) and 2,4,6-tris(chloromethyl)-s-triazine (TCMT).
  • TATA 1,3,5-triazinane-1,3,5- triyl)triprop-2-en-1-one
  • TATA 1,3,5- tris(bromoacetyl) hexahydro-1,3,5-triazine
  • TCMT 2,4,6-tris(chloromethyl)-s-triazine
  • the molecular scaffold is 1 , 1 ', 1 "-(1 ,3,5-triazinane-1 ,3,5-triyl)triprop- 2-en-1-one (also known as triacryloylhexahydro-s-triazine (TATA):
  • the molecular scaffold forms a tri-substituted 1,T,1"-(1,3,5-triazinane- 1,3,5-triyl)tripropan-1-one derivative of TATA having the following structure: wherein * denotes the point of attachment of the three cysteine residues.
  • the molecular scaffold is 1 ,3,5-tris(bromoacetyl) hexahydro-1, 3,5-triazine (TATB):
  • the molecular scaffold forms a tri-substituted 1,3,5-tris(bromoacetyl) hexahydro-1, 3,5-triazine derivative of TATB having the following structure: wherein * denotes the point of attachment of the three cysteine residues.
  • the molecular scaffold is 2,4,6-tris(chloromomethyl)-s-triazine (TCMT):
  • the molecular scaffold forms a tri-substituted 2,4,6-tris(chloromomethyl)-s- triazine derivative of TCMT having the following structure: wherein * denotes the point of attachment of the three cysteine residues.
  • the molecular scaffold of the invention may be bonded to the polypeptide via functional or reactive groups on the polypeptide. These are typically formed from the side chains of particular amino acids found in the polypeptide polymer. Such reactive groups may be a cysteine side chain, a [Dap(Me)] group, a lysine side chain, or an N-terminal amine group or any other suitable reactive group. Details may be found in WO 2009/098450. In one embodiment, the reactive groups are all cysteine residues.
  • reactive groups of natural amino acids are the thiol group of cysteine, the amino group of lysine, the carboxyl group of aspartate or glutamate, the guanidinium group of arginine, the phenolic group of tyrosine or the hydroxyl group of serine.
  • Non-natural amino acids can provide a wide range of reactive groups including an azide, a keto-carbonyl, an alkyne, a vinyl, or an aryl halide group.
  • the amino and carboxyl group of the termini of the polypeptide can also serve as reactive groups to form covalent bonds to a molecular scaffold/molecular core.
  • polypeptides of the invention contain at least three reactive groups. Said polypeptides can also contain four or more reactive groups. The more reactive groups are used, the more loops can be formed in the molecular scaffold.
  • polypeptides with three reactive groups are generated. Reaction of said polypeptides with a molecular scaffold/molecular core having a three-fold rotational symmetry generates a single product isomer.
  • the generation of a single product isomer is favourable for several reasons.
  • the nucleic acids of the compound libraries encode only the primary sequences of the polypeptide but not the isomeric state of the molecules that are formed upon reaction of the polypeptide with the molecular core. If only one product isomer can be formed, the assignment of the nucleic acid to the product isomer is clearly defined. If multiple product isomers are formed, the nucleic acid cannot give information about the nature of the product isomer that was isolated in a screening or selection process.
  • a single product isomer is also advantageous if a specific member of a library of the invention is synthesized.
  • the chemical reaction of the polypeptide with the molecular scaffold yields a single product isomer rather than a mixture of isomers.
  • polypeptides with four reactive groups are generated. Reaction of said polypeptides with a molecular scaffold/molecular core having a tetrahedral symmetry generates two product isomers. Even though the two different product isomers are encoded by one and the same nucleic acid, the isomeric nature of the isolated isomer can be determined by chemically synthesizing both isomers, separating the two isomers and testing both isomers for binding to a target ligand.
  • At least one of the reactive groups of the polypeptides is orthogonal to the remaining reactive groups.
  • the use of orthogonal reactive groups allows the directing of said orthogonal reactive groups to specific sites of the molecular core.
  • Linking strategies involving orthogonal reactive groups may be used to limit the number of product isomers formed. In other words, by choosing distinct or different reactive groups for one or more of the at least three bonds to those chosen for the remainder of the at least three bonds, a particular order of bonding or directing of specific reactive groups of the polypeptide to specific positions on the molecular scaffold may be usefully achieved.
  • the reactive groups of the polypeptide of the invention are reacted with molecular linkers wherein said linkers are capable to react with a molecular scaffold so that the linker will intervene between the molecular scaffold and the polypeptide in the final bonded state.
  • amino acids of the members of the libraries or sets of polypeptides can be replaced by any natural or non-natural amino acid.
  • exchangeable amino acids are the ones harbouring functional groups for cross-linking the polypeptides to a molecular core, such that the loop sequences alone are exchangeable.
  • the exchangeable polypeptide sequences have either random sequences, constant sequences or sequences with random and constant amino acids.
  • the amino acids with reactive groups are either located in defined positions within the polypeptide, since the position of these amino acids determines loop size.
  • an polypeptide with three reactive groups has the sequence (X)iY(X) m Y(X)nY(X) o , wherein Y represents an amino acid with a reactive group, X represents a random amino acid, m and n are numbers between 3 and 6 defining the length of intervening polypeptide segments, which may be the same or different, and I and o are numbers between 0 and 20 defining the length of flanking polypeptide segments.
  • thiol-mediated conjugations can be used to attach the molecular scaffold to the peptide via covalent interactions.
  • these techniques may be used in modification or attachment of further moieties (such as small molecules of interest which are distinct from the molecular scaffold) to the polypeptide after they have been selected or isolated according to the present invention - in this embodiment then clearly the attachment need not be covalent and may embrace non-covalent attachment.
  • the peptides of the present invention may be manufactured synthetically by standard techniques followed by reaction with a molecular scaffold in vitro. When this is performed, standard chemistry may be used. This enables the rapid large scale preparation of soluble material for further downstream experiments or validation. Such methods could be accomplished using conventional chemistry such as that disclosed in Timmerman et ai. (supra).
  • the invention also relates to manufacture of polypeptides selected as set out herein, wherein the manufacture comprises optional further steps as explained below. In one embodiment, these steps are carried out on the end product polypeptide made by chemical synthesis.
  • Peptides can also be extended, to incorporate for example another loop and therefore introduce multiple specificities.
  • the peptide may simply be extended chemically at its N-terminus or C-terminus or within the loops using orthogonally protected lysines (and analogues) using standard solid phase or solution phase chemistry.
  • Standard (bio)conjugation techniques may be used to introduce an activated or activatable N- or C-terminus.
  • additions may be made by fragment condensation or native chemical ligation e.g. as described in (Dawson et ai. 1994. Synthesis of Proteins by Native Chemical Ligation. Science 266:776-779), or by enzymes, for example using subtiligase as described in (Chang etal. Proc Natl Acad Sci U S A. 1994 Dec 20; 91 (26): 12544-8 or in Hikari et ai Bioorganic & Medicinal Chemistry Letters Volume 18, Issue 22, 15 November 2008, Pages 6000-6003).
  • the peptides may be extended or modified by further conjugation through disulphide bonds. This has the additional advantage of allowing the first and second peptide to dissociate from each other once within the reducing environment of the cell.
  • the molecular scaffold e.g.
  • TATA, TATB or TCMT could be added during the chemical synthesis of the first peptide so as to react with the three cysteine groups; a further cysteine or thiol could then be appended to the N or C-terminus of the first peptide, so that this cysteine or thiol only reacted with a free cysteine or thiol of the second peptide, forming a disulfide -linked bicyclic peptide-peptide conjugate. Similar techniques apply equally to the synthesis/coupling of two bicyclic and bispecific macrocycles, potentially creating a tetraspecific molecule.
  • composition comprising a peptide ligand as defined herein in combination with one or more pharmaceutically acceptable excipients.
  • the present peptide ligands will be utilised in purified form together with pharmacologically appropriate excipients or carriers.
  • these excipients or carriers include aqueous or alcoholic/aqueous solutions, emulsions or suspensions, including saline and/or buffered media.
  • Parenteral vehicles include sodium chloride solution, Ringer's dextrose, dextrose and sodium chloride and lactated Ringer's.
  • Suitable physiologically- acceptable adjuvants if necessary to keep a polypeptide complex in suspension, may be chosen from thickeners such as carboxymethylcellulose, polyvinylpyrrolidone, gelatin and alginates.
  • Intravenous vehicles include fluid and nutrient replenishers and electrolyte replenishers, such as those based on Ringer's dextrose. Preservatives and other additives, such as antimicrobials, antioxidants, chelating agents and inert gases, may also be present (Mack (1982) Remington's Pharmaceutical Sciences, 16th Edition).
  • the compounds of the invention can be used alone or in combination with another agent or agents.
  • the compounds of the invention can also be used in combination with biological therapies such as nucleic acid based therapies, antibodies, bacteriophage or phage lysins.
  • the route of administration of pharmaceutical compositions according to the invention may be any of those commonly known to those of ordinary skill in the art.
  • the peptide ligands of the invention can be administered to any patient in accordance with standard techniques.
  • Routes of administration include, but are not limited to, oral (e.g., by ingestion); buccal; sublingual; transdermal (including, e.g., by a patch, plaster, etc.); transmucosal (including, e.g., by a patch, plaster, etc.); intranasal (e.g., by nasal spray); ocular (e.g., by eyedrops); pulmonary (e.g., by inhalation or insufflation therapy using, e.g., via an aerosol, e.g., through the mouth or nose); rectal (e.g., by suppository or enema); vaginal (e.g., by pessary); parenteral, for example, by injection, including subcutaneous, intraderma
  • the peptide ligands of this invention can be lyophilised for storage and reconstituted in a suitable carrier prior to use. This technique has been shown to be effective and art-known lyophilisation and reconstitution techniques can be employed. It will be appreciated by those skilled in the art that lyophilisation and reconstitution can lead to varying degrees of activity loss and that levels may have to be adjusted upward to compensate.
  • compositions containing the present peptide ligands or a cocktail thereof can be administered for therapeutic treatments.
  • an adequate amount to accomplish at least partial inhibition, suppression, modulation, killing, or some other measurable parameter, of a population of selected cells is defined as a "therapeutically-effective dose”. Amounts needed to achieve this dosage will depend upon the severity of the disease and the general state of the patient's own immune system, but generally range from 10 pg to 250 mg of selected peptide ligand per kilogram of body weight, with doses of between 100 pg to 25 mg/kg/dose being more commonly used.
  • a composition containing a peptide ligand according to the present invention may be utilised in therapeutic settings to treat a microbial infection or to provide prophylaxis to a subject at risk of infection e.g. undergoing surgery, chemotherapy, artificial ventilation or other condition or planned intervention.
  • the peptide ligands described herein may be used extracorporeally or in vitro selectively to kill, deplete or otherwise effectively remove a target cell population from a heterogeneous collection of cells.
  • Blood from a mammal may be combined extracorporeally with the selected peptide ligands whereby the undesired cells are killed or otherwise removed from the blood for return to the mammal in accordance with standard techniques.
  • the bicyclic peptides of the invention have specific utility as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) binding agents.
  • SARS-CoV-2 severe acute respiratory syndrome coronavirus 2
  • Polypeptide ligands selected according to the method of the present invention may be employed in in vivo therapeutic applications, in vitro and in vivo diagnostic applications, in vitro assay and reagent applications, and the like.
  • in some applications, such as vaccine applications the ability to elicit an immune response to predetermined ranges of antigens can be exploited to tailor a vaccine to specific diseases and pathogens.
  • Substantially pure peptide ligands of at least 90 to 95% homogeneity are preferred for administration to a mammal, and 98 to 99% or more homogeneity is most preferred for pharmaceutical uses, especially when the mammal is a human.
  • the selected polypeptides may be used diagnostically or therapeutically (including extracorporeally) or in developing and performing assay procedures, immunofluorescent stainings and the like (Lefkovite and Pernis, (1979 and 1981) Immunological Methods, Volumes I and II, Academic Press, NY).
  • a peptide ligand as defined herein for use in suppressing or treating a disease or disorder mediated by infection of SARS-CoV-2 or for providing prophylaxis to a subject at risk of infection of SARS-CoV-2.
  • a method of suppressing or treating a disease or disorder mediated by infection of SARS-CoV-2 or for providing prophylaxis to a subject at risk of infection of SARS-CoV-2 which comprises administering to a patient in need thereof the peptide ligand as defined herein.
  • references herein to “disease or disorder mediated by infection of SARS-CoV-2” include: respiratory disorders, such as a respiratory disorder mediated by an inflammatory response within the lung, in particular COVID-19.
  • References herein to the term “suppression” refers to administration of the composition after an inductive event, but prior to the clinical appearance of the disease. “Treatment” involves administration of the protective composition after disease symptoms become manifest.
  • bicyclic peptide ligands of the invention also find utility as agents for screening for other SARS-CoV-2 binding agents.
  • screening for a SARS-CoV-2 binding agent may typically involve incubating a bicyclic peptide ligand of the invention with SARS-CoV-2 in the presence and absence of a test compound and assessing a difference in the degree of binding, such that a difference in binding will result from competition of the test compound with the bicyclic peptide ligand of the invention for binding to SARS-CoV-2.
  • step (c) incubating said peptide ligand from step (a) with a test compound and SARS-
  • step (e) comparing the binding activity in steps (b) and (d), such that a difference in binding activity of said peptide ligand is indicative of the test compound binding to SARS- CoV-2.
  • the peptide ligand comprises a reporter moiety for ease of detecting binding.
  • the reporter moiety comprises fluorescein (FI).
  • the peptide ligand comprises any of the peptide ligands described herein which comprise a fluorescein (FI) moiety.
  • bicyclic peptide ligands of the invention also find utility as agents for diagnosing infection of SARS-CoV-2.
  • diagnosis of SARS-CoV-2 infection may typically involve incubating a bicyclic peptide ligand of the invention with SARS-CoV-2 in the presence and absence of a test compound and assessing a difference in the degree of binding, such that a difference in binding will result from competition of the test compound with the bicyclic peptide ligand of the invention for binding to SARS-CoV-2.
  • a method of diagnosing SARS-CoV-2 infection comprising the following steps: a) obtaining a biological sample from an individual;
  • step (b) incubating a peptide ligand as defined herein with the biological sample obtained in step (a);
  • the peptide ligand comprises a reporter moiety for ease of detecting binding.
  • the reporter moiety comprises fluorescein (FI).
  • the peptide ligand comprises any of the peptide ligands described herein which comprise a fluorescein (FI) moiety.
  • Peptide synthesis was based on Fmoc chemistry, using a Symphony peptide synthesiser manufactured by Peptide Instruments and a Syro II synthesiser by MultiSynTech. Standard Fmoc-amino acids were employed (Sigma, Merck), with appropriate side chain protecting groups: where applicable standard coupling conditions were used in each case, followed by deprotection using standard methodology. Alternatively, peptides were purified using HPLC and following isolation they were modified with the required molecular scaffold (namely, TATA, TATB or TCMT).
  • Standard Fmoc-amino acids were employed (Sigma, Merck), with appropriate side chain protecting groups: where applicable standard coupling conditions were used in each case, followed by deprotection using standard methodology.
  • peptides were purified using HPLC and following isolation they were modified with the required molecular scaffold (namely, TATA, TATB or TCMT).
  • linear peptide was diluted with 50:50 MeCNLFhO up to ⁇ 35 ml_, -500 pl_ of 100 mM scaffold in acetonitrile was added, and the reaction was initiated with 5 ml_ of 1 M NH4HCO3 in H2O. The reaction was allowed to proceed for -30 -60 min at RT, and lyophilised once the reaction had completed (judged by MALDI). Once completed, 1ml of 1M L-cysteine hydrochloride monohydrate (Sigma) in H2O was added to the reaction for -60 min at RT to quench any excess TATA, TATB or TCMT.
  • the modified peptide was purified as above, while replacing the Luna C8 with a Gemini C18 column (Phenomenex), and changing the acid to 0.1% trifluoroacetic acid. Pure fractions containing the correct scaffold-modified material were pooled, lyophilised and kept at -20°C for storage.
  • peptides are converted to activated disulfides prior to coupling with the free thiol group of a toxin using the following method; a solution of 4-methyl(succinimidyl 4-(2- pyridylthio)pentanoate) (100mM) in dry DMSO (1.25 mol equiv) was added to a solution of peptide (20mM) in dry DMSO (1 mol equiv). The reaction was well mixed and DIPEA (20 mol equiv) was added. The reaction was monitored by LC/MS until complete.
  • Example 1 Affinity determination by fluorescence polarization (FP) direct binding.
  • Bicycles labelled with fluorescein were screened in a fluorescence polarisation direct binding assay to determine affinity (K d ) forwild-type (WT) S1 domain (ACROBiosystems, S1N-C82E8) of the SARS-CoV-2 Spike Protein. Tracers were added at 1 nM final to a titration of individual SARS-CoV-2 Spike Protein variants in assay buffer (PBS + 0.01 % Tween20, pH7.4) to a maximum of 2.54mM. Fluorescence was measured at 485/520/520 on a BMG PHERAstar FSX plate reader.
  • Example 3 Affinity determination by fluorescence polarization (FP) direct binding using mutated variants of Spike Protein
  • Example 3 demonstrate that the tested bicyclic peptides demonstrated excellent binding activity to the mutated variants of the S1 spike protein with only several instances of no binding observed within the limits of the assay.
  • SPR assays were performed on a Biacore T200 (Cytiva) with Series S Streptavidin (SA) sensor chips (Cytiva) in assay buffer (pH7.4, 10 mM HEPES, 150 mM NaCI, 3 mM EDTA, 0.05 % (v/v) Surfactant P20, 2% DMSO) or alternatively nickle chloride activated Sesies S
  • Sensor Chip NTA Chip NTA (Cytiva) in assay buffer (PBS-P+ (Cytiva), 1% DMSO).
  • Spike protein contructs (ACROBiosystems) protein was captured to generate 3000-4000 RU.
  • Peptide binding was performed at 25 °C, using a 30 mI/min flow rate with appropriate association and dissociation periods. Bicycles were assayed at concentrations between no greater than IOOOOhM in either a multiple or single cycle kinetic format. All data were double- referenced against blank injections and reference surface (treated with assay buffer) using standard processing procedures. Regeneration of streptavidin surface was performed using 1mM HCI (30 s at 30 pL/min) followed by a stabilization period of 30 s.
  • Replication deficient SARS-CoV-2 pseudotyped HIV-1 virions were prepared similarly as described in Mallery et al (2021) Sci Adv 7(11). Briefly, virions were produced in HEK 293T cells by transfection with 1 pg of the plasmid encoding SARS CoV-2 Spike protein (pCAGGS-SpikeAc19), 1 pg pCRV GagPol and 1.5 pg GFP-encoding plasmid (CSGW). Viral supernatants were filtered through a 0.45 pm syringe filter at 48 h and 72 h post transfection and pelleted for 2 h at 28,000 x g. Pelleted virions were drained and then resuspended in DMEM (Gibco).
  • HEK 293T-hACE2-TMPRSS2 cells were prepared as described in Papa et al (2021) PLoS Pathog 17(1): p. e1009246. Cells were plated into 96-well plates at a density of 2 x 103 cells per well in Free style 293T expression media and allowed to attach overnight. 18 pi pseudovirus-containing supernatant was mixed with 2 pi dilutions of bicyclic peptide and incubated for 40 min at RT. 10 pi of this mixture was added to cells. 72 h later, cell entry was detected through the expression of GFP by visualisation on an Incucyte S3 live cell imaging system (Sartorius). The percent of cell entry was quantified as GFP positive areas of cells over the total area covered by cells. Entry inhibition by the Bicycle was calculated as percent virus infection relative to virus only control.
  • A549_ACE_TMPRSS2 cells were seeded in 96-well plates and cultured overnight. The following day, 4-fold serial dilutions of the bicyclic peptides were prepared in medium and 60 pi of the diluted compounds starting from a maximum concentration of 30, 15, 10, 3, 1 , or 0.1 pM were added to the plates with cells. After 3h pre-incubation, cells were infected with SARS-CoV-2 GLA-1 at MOI 0.04 PFU/cell. One dose of 522 PFU of the virus in 60 pi per well was added to the wells containing compounds. Plates were incubated for 72 h at 37°C, fixed and stained when the cytopathic effect (CPE) was visible. Plates were scanned in a plate reader to quantitate the levels of CPE.
  • CPE cytopathic effect

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WO2024009108A1 (en) * 2022-07-07 2024-01-11 Bicycletx Limited Anti-infective bicyclic peptide ligands

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