WO2012162291A1 - Compositions and methods for modulating the activity of epstein-barr nuclear antigen 1 - Google Patents

Compositions and methods for modulating the activity of epstein-barr nuclear antigen 1 Download PDF

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WO2012162291A1
WO2012162291A1 PCT/US2012/038938 US2012038938W WO2012162291A1 WO 2012162291 A1 WO2012162291 A1 WO 2012162291A1 US 2012038938 W US2012038938 W US 2012038938W WO 2012162291 A1 WO2012162291 A1 WO 2012162291A1
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ebnal
compound
group
activity
epstein
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PCT/US2012/038938
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French (fr)
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Paul M. LIEBERMAN
Troy MESSICK
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The Wistar Institute
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Priority to EP12789638.9A priority Critical patent/EP2714941A4/en
Priority to US14/119,541 priority patent/US9309212B2/en
Priority to JP2014512942A priority patent/JP2014517847A/en
Priority to CN201280025422.3A priority patent/CN103717757A/en
Publication of WO2012162291A1 publication Critical patent/WO2012162291A1/en
Priority to US15/054,455 priority patent/US20160168144A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A61P31/20—Antivirals for DNA viruses
    • A61P31/22—Antivirals for DNA viruses for herpes viruses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/77—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D307/78—Benzo [b] furans; Hydrogenated benzo [b] furans
    • C07D307/79—Benzo [b] furans; Hydrogenated benzo [b] furans with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to carbon atoms of the hetero ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/77—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems
    • C07D307/78—Benzo [b] furans; Hydrogenated benzo [b] furans
    • C07D307/82—Benzo [b] furans; Hydrogenated benzo [b] furans with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the hetero ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/04—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/12—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D407/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00
    • C07D407/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00 containing two hetero rings
    • C07D407/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
    • C07D413/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
    • C07D413/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
    • C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links

Definitions

  • Epstein-Barr virus is a carcinogenic cofactor for several lymphoid and epithelial cell malignancies (Kieff (2007) Epstein-Barr Virus and its Replication, 5th ed. Wolters Kluwer Health/Lippincott Williams & Wilkins, Philadelphia; Rickinson & Kieff (2007) Epstein-Barr Virus, 5th ed. Wolters Kluwer Health/Lippincott Williams & Wilkins, Philadelphia; Young & Rickinson (2004) Nat. Rev. Cancer 4:757-68) . EBV is associated with the majority of endemic forms of Burkitt's lymphoma and nasopharyngeal carcinomas (NPC) .
  • NPC nasopharyngeal carcinomas
  • EBV is also found in -50% of all Hodgkin's disease tumor biopsies, some forms of gastric carcinoma, thyroid tumors, NK/T cell lymphoma, and the majority of immunosuppression-associated non-Hodgkin' s lymphomas and lymphoproliferative disease.
  • Most EBV associated tumors harbor the latent viral genome as a multicopy episome in the nucleus of the transformed cells. During latent infection, EBV does not produce progeny virions, but does express a limited set of viral gene products that promote host -cell survival and proliferation. In proliferating cells, the maintenance of the latent viral genome depends on the functions of the Epstein-Barr Nuclear Antigen 1 (EBNA1) protein (height & Sugden (2000) Rev.
  • EBNA1 Epstein-Barr Nuclear Antigen 1
  • EBNA1 is expressed in all types of EBV latent infection found in proliferating cells and tumors. EBNA1 is essential for the immortalization of primary B lymphocytes by EBV infection (Humme, et al . (2003) Proc . Natl. Acad. Sci. USA 100:10989-94), and its inhibition by siRNA depletion or by ectopic expression of dominant negative mutants causes infected cells death (Kennedy, et al. (2003) Proc. Natl. Acad. Sci. USA 100:14269-14274; Yin & Flemington (2006) Virology 346 : 385-93) .
  • EBNAl is a candidate for targeting inhibition of EBV latent infection. EBNAl is consistently expressed in most, if not all, EBV-associated malignancies (Thorley-Lawson & Gross (2004) N. Engl. J. Med. 350:1328-37) . EBNAl is essential for viral genome maintenance and for infected- cell survival (Kennedy, et al . (2003) supra; Yin & Flemington (2006) supra) . Most importantly, EBNAl is a viral-encoded protein that has well-defined biochemical and structural properties.
  • EBNAl is composed of two major functional domains, a carboxy-terminal DNA binding domain, and an amino-terminal chromosome tethering domain (Leight & Sugden (2000) supra; Wang, et al . (2006) Mol . Cell Biol. 26:1124-34) .
  • the DNA binding domain is essential for interaction with the viral origin of plasmid replication (OriP) (Yates, et al . (1985) Nature 313 : 812-815) .
  • OriP is composed of a series of 30 bp repeats to which EBNAl binds an 18 bp palindromic -sequence as a homodimer (Ambinder, et al. (1990) J. Virol.
  • HTVS has emerged as an attractive and complementary approach to traditional HTS .
  • HTVS typically depends on the availability of a high-resolution crystal structure of the protein target as a template for computational screening.
  • targets such as HIV-1 protease, thymidylate, influenza hemagglutinin, and parasitic proteases (Siddiquee, et al .
  • the present invention features a compound of Formula I, II or III.
  • X is O or NH
  • R 1 is a substituted or unsubstituted phenyl, pyridyl or thiazole group.
  • R 3 is CR 4 , a substituted or unsubstituted pyridyl group, a pyrimidinyl group, a phenylmorpholine group; an
  • R 4 is a substituted or unsubstituted phenyl group
  • R 7 is a substituted or unsubstituted phenyl, pyridyl, or pyrimidinyl group.
  • a pharmaceutical composition comprising a compound of the invention in admixture with a pharmaceutically acceptable carrier is also provide as are methods for modulating the activity of Epstein-Barr Nuclear Antigen 1 (EBNA1) protein and treating a latent Epstein- Barr virus infection with a composition of the present invention.
  • EBNA1 Epstein-Barr Nuclear Antigen 1
  • Flourescence polarization (FP) -based high throughput screening and electrophoresis mobility shift assays (EMSA) were conducted to identify small molecule inhibitors of Epstein-Barr Nuclear Antigen 1 (EBNAl) .
  • Compounds identified in these assays were found to be highly selective inhibitors of EBNAl.
  • the compounds of the present invention were found to share a common benzofuran structure. More specifically, the compounds of the invention had the structures of Formula I, Formula II and Formula III.
  • R 1 is a substituted or unsubstituted phenyl, pyridyl or thiazole group.
  • R 3 is CR 4 , a substituted or unsubstituted pyridyl group, a pyrimidi a phenylmorpholine group;
  • R 4 is a substituted or unsubstituted phenyl group
  • R 7 is a substituted or unsubstituted phenyl, pyridyl, or pyriraidinyl group.
  • “Lower alkyl” is intended to mean a branched or unbranched saturated monovalent hydrocarbon radical containing 1 to 6 carbon atoms, such as methyl, ethyl, propyl, isopropyl, tert -butyl, butyl, n-hexyl and the like.
  • substituent groups include, but are not limited to, halogen (i.e., fluorine, chlorine, bromine and iodine), lower alkyl, ethoxy, methoxy, hydroxyl, amine, amide, nitro, nitroso, aldehyde, carboxyl, sulhydryl, and carbonothioyl .
  • halogen i.e., fluorine, chlorine, bromine and iodine
  • lower alkyl ethoxy, methoxy, hydroxyl, amine, amide, nitro, nitroso, aldehyde, carboxyl, sulhydryl, and carbonothioyl .
  • Exemplary compounds of Formula I, Formula II and Formula III are presented in Table 2. Such compounds can be prepared as pharmaceutical compositions, pharmaceutically acceptable derivatives, or pharmaceutically acceptable salts and be provided alone or in combination in the form of a kit with unit doses of the subject compounds. In such kits, in addition to the containers containing the unit doses will be an informational package insert describing the use and attendant benefits of using the compound (s).
  • a "pharmaceutically acceptable derivative" of a compound of the invention include salts, esters, enol ethers, enol esters, acetals, ketals, orthoesters, hemiacetals, hemiketals, acids, bases, solvates, hydrates or prodrugs thereof.
  • Such derivatives may be readily prepared by those of skill in this art using known methods for such derivatization.
  • the compounds produced may be administered to animals or humans without substantial toxic effects and either are pharmaceutically active or are prodrugs .
  • a "pharmaceutically acceptable salt” of a compound means a salt that is pharmaceutically acceptable and that possesses the desired pharmacological activity of the parent compound.
  • Such salts include: (1) acid addition salts, formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like; or formed with organic acids such as acetic acid, propionic acid, hexanoic acid, cyclopentanepropionic acid, glycolic acid, pyruvic acid, lactic acid, malonic acid, succinic acid, malic acid, maleic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, 3- ⁇ 4 -hydroxybenzoyl ) benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, 1,2-ethanedisulfonic acid, 2 -hydroxyethanesulfonic acid, benzen
  • the present invention also pertains to analogs and derivatives of said compounds that modulate EBNAl activity.
  • the EBNAl three-dimensional crystal structure in combination with the structure of the instant compounds can be used to design or screen for a test compound with EBNAl inhibitory activity; and the compound designed or screened for can be tested for its ability to modulate the activity of EBNAl.
  • the screening is carried out using various in silico, in vitro and/or in vivo assays based on detecting interactions between the DNA binding domain or residues of the DNA binding domain of EBNAl and a test compound.
  • EBNAl refers to the Epstein-Barr Nuclear Antigen 1 protein.
  • EBNAl is described, e.gr., in GENBAN Accession No. YP_401677, and set forth herein in SEQ ID NO : 1.
  • Full-length EBNAl protein can be used in accordance with this invention or alternatively, the DNA binding domain of EBNAl can be used (i.e., amino acid residues 454 to 607) .
  • reference to EBNAl also includes synthetic variants of EBNAl, as well as fragments of EBNAl, Synthetic variants include those which have at least 80%, preferably at least 90%, homology to EBNAl disclosed herein and possess the ability to bind DNA. More preferably, such variants correspond to the sequence of EBNAl provided herein, but have one or more, e.g., from 1 to 10, or from 1 to 5 substitutions, deletions or insertions of amino acids. Fragments of EBNAl and variants thereof are preferably between 100 and 500 amino acid residues in length or between 150 and 300 amino acids in length. An exemplary fragment includes the approximately 150 amino acid residues encompassing the DNA binding domain of EBNAl.
  • molecular design techniques can be employed to design, identify and synthesize analogs and derivatives, including inhibitory and stimulatory compounds, capable of binding to one or more amino acids of the DNA binding pocket of EBNAl .
  • the structure of the DNA binding pocket of EBNAl can be used in conjunction with computer modeling using a docking program such as GRAM, DOCK, HOOK or AUTODOCK (Dunbrack, et al . (1997) FoldingSc Design 2:27-42) to identify potential modulators of EBNAl protein.
  • This procedure can include computer fitting of compounds to the DNA binding pocket of EBNAl to, e.g., ascertain how well the shape and the chemical structure of the compound will complement the DNA binding domain; or to compare the compound with the binding of an inhibitor disclosed herein.
  • Computer programs can also be employed to estimate the attraction, repulsion and stearic hindrance of the EBNAl protein and effector compound. Generally, the tighter the fit, the lower the stearic hindrances, the greater the attractive forces, and the greater the specificity, which are important features for a specific effector compound which is more likely to interact with the EBNAl protein rather than other classes of proteins .
  • a chemical-probe approach can be alternatively or additionally be employed in the design of EBNAl modulators or effectors.
  • Goodford ((1985) J “ . Med. Chem. 28:849) describes several commercial software packages, such as GRID (Molecular Discovery Ltd., Oxford, UK), which can be used to probe the EBNAl DNA binding domain with different chemical probes, e.g. , water, a methyl group, an amine nitrogen, a carboxyl oxygen, and a hydroxyl .
  • GRID Molecular Discovery Ltd., Oxford, UK
  • Analogs and derivatives of the compounds of the present invention can also be designed by visually inspecting the three-dimensional structure of the EBNA1 DNA binding domain to determine more effective inhibitors or activators.
  • This type of modeling is generally referred to as "manual" drug design.
  • Manual drug design can employ visual inspection and analysis using a graphics visualization program such as "0" (Jones, et al . (1991) Acta Crystallographica Section A A47 : 110-119) . Initially effector compounds are selected by manual drug design. The structural analog thus designed can then be modified by computer modeling programs to better define the most likely effective candidates.
  • Programs suitable for searching three-dimensional databases include MACCS-3D and ISIS/3D (Molecular Design Ltd, San Leandro, CA) , ChemDBS-3D (Chemical Design Ltd., Oxford, UK), and Sybyl/3 DB Unity (Tripos Associates, St Louis, MO) .
  • Programs suitable for compound selection and design include, e.g., DISCO (Abbott Laboratories, Abbott Park, IL) , Catalyst ⁇ Bio-CAD Corp., Mountain View, CA) , and ChemDBS-3D (Chemical Design Ltd., Oxford, UK) .
  • Analogs and derivatives of the compounds of the present invention can bind to all or a portion of the DNA binding domain of EBNAl and may be more potent, more specific, less toxic and more effective than the instant compounds.
  • the designed compounds can also be less potent but have a longer half- life in vivo and/or in vitro and therefore be more effective at modulating EBNAl activity in vivo and/or in vitro for prolonged periods of time.
  • Such designed modulators are useful to activate EBNAl or inhibit EBNAl activity to, e . g. , prevent tumor formation.
  • the present invention also provides the use of molecular design techniques to computationally screen small molecule databases for chemical entities or compounds that can bind to EBNAl in a manner analogous to its natural substrates and/or compounds disclosed herein.
  • Such computational screening can identify various groups which interact with one or more amino acid residues of the DNA binding domain and can be employed to synthesize modulators of the present invention.
  • in vitro screening assays are also embraced by the present invention.
  • such assays include combining EBNAl or the EBNAl DNA binding domain (e.g., as disclosed herein), with or without substrates (e.g., a DNA probe) in solution and determining whether an analog or derivative can block or enhance EBNAl DNA binding activity.
  • in vitro screening assays can be carried out to monitor DNA binding in the presence or absence of an analog or derivative.
  • the present invention embraces the use of a FP-based assay and/or E SA to demonstrate binding of an analog or derivative to the DNA binding domain of EBNAl .
  • Such assays are routinely practiced in the art and disclosed in more detail herein.
  • the analog or derivative is subsequently tested for its ability to modulate the activity of EBNA1 in vivo. This can be carried out using conventional assays such as the cell-based reporter assay disclosed herein or by determining EBV genome copy number maintenance.
  • a model system of any particular disease or disorder involving latent EBV infection can be utilized to evaluate the adsorption, distribution, metabolism and excretion of a compound as well as its potential toxicity in acute, sub-chronic and chronic studies.
  • the effector or modulatory compound can be tested in the model disclosed in Example 2, the EBV model using beige/nude/xid mice carrying human lymphoid xenografts (Dosch, et al .
  • EBNA1 protein is expressed in all EBV-associated tumors, where it is indispensable for viral replication, genome maintenance and viral gene expression.
  • EBNA1 ' transcription factor- like functions also extend to influencing the expression of cellular genes involved in pathways commonly dysregulated during oncogenesis. Therefore, in one embodiment inhibitors of EBNA1 DNA binding activity inhibit viral replication by disruption of EBNA1 DNA binding. In many cases, inhibition of viral replication equates with inhibition of tumor formation. Therefore, inhibitors of EBNA1 DNA binding activity will be effective therapeutic agents for treatment of human diseases or conditions caused by EBV latent infection, in particular EBV-associated tumors.
  • EBNAl has been shown to regulate host cell gene expression.
  • EBNAl has been shown to induce the expression of CD25, RAG1, RAG2 and CCL20 in B-cells (Baumforth, et al . (2008) Am. J. Pathol. 173:195-204; Kube, et al . (1999) J. Virol. 73:1630-1636; Srinivas & Sixbey (1995) J. Virol. 69:8155-8158), and the differential regulation of cellular genes involved in translation, transcription and cell signaling in epithelial cells (O'Neil, et al . (2008) J. Gen. Virol. 89:2833-2842; Wood, et al. (2007) Oncogene 26:4135-4147).
  • EBNAl enhances STAT1 expression which sensitizes cells to interferon-induced STAT1 activation, modulates signaling in the GF i pathway, and increases AP-1 activity resulting in the enhancement of host cell mechanisms involved in angiogenesis and metastasis (O'Neil, et al . (2008) supra; Wood, et al . (2007) supra).
  • compounds that activate EBNAl are of use in inducing the lytic cycle of EBV to study pathogenesis and analyze the effect of EBNAl on host cell gene expression.
  • the molecules of the invention can be used whenever it is desired to increase or decrease EBNAl activity in a cell or organism,
  • the compounds, analogs and derivatives of the present invention find application in a method for modulating (i.e., blocking or inhibiting, or enhancing or activating) EBNAl.
  • a method for modulating i.e., blocking or inhibiting, or enhancing or activating
  • Such a method involves contacting EBNAl either in vitro or in vivo with an effective amount of a compound, analog or derivative of the invention so that the activity of EBNAl is modulated.
  • An effective amount of an effector or modulatory compound is an amount which reduces or increases the activity of the EBNAl by at least 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% when compared to EBNAl not contacted with the compound.
  • Such activity can be raonitored by reporter-based assays for detecting activity of the EBNA1 or in competitive binding assays with a DNA substrate.
  • Compounds particularly embraced by the invention are provided herein in the Examples.
  • modulating the activity of EBNA1 can be useful in selectively analyzing EBNA1 signaling events in model systems as well as in preventing or treating diseases, conditions, and disorders involving EBNA1 latent infection.
  • the selection of the compound for use in preventing or treating a particular disease or disorder will be dependent upon the particular disease or disorder.
  • EBNA1 is involved in cancer and therefore a compound which inhibits EBNA1 will be useful in the prevention or treatment of cancer including, but not limited to Burkitt's lymphoma, nasopharyngeal carcinoma, Hodgkin ' s lymphoma, post- transplant lymphoproliferative disease, some forms of gastric carcinoma, thyroid tumors, NK/T cell lymphoma, and immunosuppression-associated non-Hodgkin' s lymphomas.
  • EBV has been suspected to have a role in the pathogenesis of chronic fatigue syndrome (Lerner, et al . (2004) In Vivo 18:101-6), such that inhibition of EBNA1 may be of use in treating this condition as well .
  • the present invention also provides a method for preventing or treating a latent Epstein-Barr virus infection.
  • Such treatment involves administering to a subject in need of treatment a pharmaceutical composition containing an effective amount of an EBNA1 inhibitory compound disclosed herein (see, e.g., Table 2) .
  • an EBNA1 inhibitory compound disclosed herein see, e.g., Table 2 .
  • this will be a human being, but treatment of agricultural animals, e.g. , livestock and poultry, and companion animals, e.g., dogs, cats and horses, is expressly covered herein.
  • treating and “treatment” refer to any and all uses which remedy a condition or symptoms, prevent the establishment of a condition or disease, or otherwise prevent, hinder, retard, or reverse the progression of a condition or disease or other undesirable symptoms .
  • the term "effective amount” includes within its meaning a non- toxic but sufficient amount of an agent or compound to provide the desired effect. The exact amount required will vary from subject to subject depending on factors such as the species being treated, the age and general condition of the subject, the severity of the condition being treated, the particular agent being administered and the mode of administration and so forth. In this respect, for any given case, an appropriate "effective amount” may be determined by one of ordinary skill in the art using only routine experimentation.
  • compositions containing a compound of the invention can be in the form of pharmaceutically acceptable salts and complexes and can be provided in a pharmaceutically acceptable carrier and at an appropriate dose.
  • Such pharmaceutical compositions can be prepared by methods and contain carriers which are well-known in the art. A generally recognized compendium of such methods and ingredients is Remington: The Science and Practice of Pharmacy, Alfonso R. Gennaro, editor, 20th ed . Lippincott Williams & ilkins : Philadelphia, PA, 2000.
  • a pharmaceutically-acceptable carrier, composition or vehicle such as a liquid or solid filler, diluent, excipient, or solvent encapsulating material, is involved in carrying or transporting the subject compound from one organ, or portion of the body, to another organ, or portion of the body.
  • a pharmaceutically-acceptable carrier, composition or vehicle such as a liquid or solid filler, diluent, excipient, or solvent encapsulating material, is involved in carrying or transporting the subject compound from one organ, or portion of the body, to another organ, or portion of the body.
  • Each carrier must be acceptable in the sense of being compatible with the other ingredients of the formulation and not injurious to the subject being treated.
  • Examples of materials which can serve as pharmaceutically acceptable carriers include sugars, such as lactose, glucose and sucrose; starches, such as corn starch and potato starch; cellulose, and its derivatives, such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; powdered tragacanth; malt; gelatin; talc; excipients, such as cocoa butter and suppository waxes; oils, such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil,- corn oil and soybean oil; glycols, such as propylene glycol; polyols, such as glycerin, sorbitol, mannitol and polyethylene glycol; esters, such as ethyl oleate and ethyl laurate; agar; buffering agents, such as magnesium hydroxide and aluminum hydroxide; alginic acid; pyrogen-free water; isotonic saline;
  • wetting agents such as sodium lauryl sulfate and magnesium stearate, as well as coloring agents, release agents, coating agents, sweetening, flavoring and perfuming agents, preservatives and antioxidants can also be present in the compositions .
  • compositions of the present invention can be administered parenterally (for example, by intravenous, intraperitoneal, subcutaneous or intramuscular injection), topically (including buccal and sublingual) , orally, intranasally, intravaginall , or rectally according to standard medical practices .
  • the selected dosage level will depend upon a variety of factors including the activity of the particular compound of the present invention employed, the route of administration, the time of administration, the rate of excretion or metabolism of the particular compound being employed, the duration of the treatment, other drugs, compounds and/or materials used in combination with the particular compound employed, the age, sex, weight, condition, general health and prior medical history of the patient being treated, and like factors well known in the medical arts .
  • a physician or veterinarian having ordinary skill in the art can readily determine and prescribe the effective amount of the pharmaceutical composition required.
  • the physician or veterinarian could start doses of a compound at levels lower than that required in order to achieve the desired therapeutic effect and gradually increase the dosage until the desired effect is achieved. This is considered to be within the skill of the artisan and one can review the existing literature on a specific compound or similar compounds to determine optimal dosing.
  • EBNAl resembles the overall structure of human papillomavirus (HPV) E2 protein, which has an analogous function to EBNAl at the HPV origin of DNA replication (Bochkarev, et al . (1995) supra).
  • HPV human papillomavirus
  • Protein structure prediction programs indicate that EBNAl and E2 share structural folds similar to the Kaposi's Sarcoma Associated herpesvirus (KSHV) LANA protein, which shares many functional properties with EBNAl, including DNA binding and episome maintenance of KSHV oriP (Garber, et al . ⁇ 2002 ⁇ supra) . Therefore, effectors identified in accordance with the method disclosed herein may also be useful in modulating the activity of LANA and E2 proteins, as well as in the treatment of diseases associated with KSHV and HPV.
  • KSHV Kaposi's Sarcoma Associated herpesvirus
  • Bound protein was extensively washed with 20 mM HEPES, pH 7.9, 1 M NaCl, 5 mM 2 -mercaptoethanol , 40 mM imidazole and 10% glycerol to dissociate nonspecific DNA bound to EBNA1 prior to elution in buffer containing 250 mM imidazole. Peak fractions of the eluted proteins were pooled and dialyzed against 20 mM HEPES, pH 7.9, 500 mM NaCl, 5 mM 2- mercaptoethanol , 10% glycerol, and 0.2 mM PMSP.
  • FP Assay [00041] FP Assay.
  • the FP assay employed a probe with a non- palindromic site having two high-affinity half sites (5'- GGG TAG CAT ATG CTA TCT aga tag cat atg eta ccc-3'; SEQ ID NO: 2) .
  • This probe bound EBNA1 with similar efficiency in EMSA (electrophoretic mobility shift assay) , but performed significantly better in the FP (fluorescence polarization, ) assay.
  • a reaction mix was prepared containing 200 mM NaCl, 20 mM Tris-Cl pH 7,4, 1 mM DTT, 10 g/mL BSA, and 5 nM CY5 ⁇ labeled EBNA1 BS Hairpin (opl 3016 ⁇ or 5 nM FITC-labeled EBNA1 BS Hairpin (opl 4624 ⁇ , with or without 246 to 100 nM purified EBNA1 DNA Binding Domain. This solution was incubated for 30 minutes at room temperature to ensure binding. Thirty of this solution was dispensed to each well of the test plate with the compounds using a BIOTEK MICROFLO Select Dispenser. The plate was then centrifuged at 165 x g to ensure the solution settled in the wells and incubated for 30 minutes at 25°C. The plate was then analyzed using a PERKIN ELMER 2104 Multilabel Reader.
  • EMSA Assay An EMSA reaction buffer was prepared containing 20% glycerol, 200 mM NaCl, 20 mM Tris-Cl pH 7.4, 1 mM DTT, 10 ⁇ g/mL BSA, and 10 nM CY5-labeled EBNA1 BS Hairpin (opl 3016) , with or without 246 nM purified EBNA1 DNA Binding Domain. This solution was incubated for 20 minutes at room temperature to ensure binding. Thirty L of this solution was dispensed to EPPENDORF tubes containing 0.5 ⁇ L of a test compound in DMSO and subsequently mixed. Samples were then loaded onto a 6% polyacrylamide gel and electrophoresed for 90 minutes at 170V. The gel was then scanned for fluorescence using a General Electric TYPHOON Imager .
  • FP Screening For initial screening, 2 ⁇ of test compounds resuspended in DMSO were plated in triplicate wells in a black PERKIN ELMER OPTIPLATE at a concentration of 50 mM to achieve a final concentration of 3.33 mM when resuspended in 30 L of reaction solution. The plate was assayed using the FP assay described herein. Specifically, 30 ⁇ of a preformed EBNA1 : CY5- or FITC-DNA hairpin complex was dispensed to wells containing candidate compounds.
  • % inhibition (mP Max -mPcm P d) / (mPMax-mPmin) x 100) .
  • results were stratified into four categories: actives (i.e., the bioactive compound displayed >15% inhibition of EBNAl DNA binding and cleanly mapped to a unique well in both the horizontal and vertical dimensions), ambiguous (i.e., the bioactive compound mapped to 2 or more wells in either dimension), orphan (i.e., an orthogonal match could not be identified in the second dimension) , and inactive ( ⁇ 15% inhibition of EBNAl DNA binding activity) .
  • actives i.e., the bioactive compound displayed >15% inhibition of EBNAl DNA binding and cleanly mapped to a unique well in both the horizontal and vertical dimensions
  • ambiguous i.e., the bioactive compound mapped to 2 or more wells in either dimension
  • orphan i.e., an orthogonal match could not be identified in the second dimension
  • inactive ⁇ 15% inhibition of EBNAl DNA binding activity
  • ICso Determination To determine IC 50 values, a 10- point 3-fold titration of each compound in 100% (v/v) DMSO was performed in duplicate starting at an initial concentration of 10 mM using a PER IN ELMER JANUS to create a master plate. From this master plate, 0.5 L was transferred to black PERKIN ELMER OPTIPLATE test plates with a PERKIN ELMER JANUS or to EPPENDORF tubes manually. The plate was assayed using the FP assay herein and the tubes assayed using the EMSA protocol described above.
  • Ug Qp-luciferase reporter plasmid (N1852) and 0.125 ⁇ g control plasmid (N799) (no EBNA) per plate. After 24 hours, the cells were harvested without trypsin, centrifuged 1200 RPM for 5 minutes and resuspended in DMEM media with 10% FBS at a concentration 100,000 cells per milliliter. Forty L of this solution (40,000 cells) was dispensed to each well of the white plate using a BIOTEK MICROFLO Select Dispenser. Test compounds were added to achieve a final concentration range of 125 ⁇ -2 nM, as described above. Cells were incubated at 37°C for 48 hours, harvested and analyzed for luciferase activity using the PROMEGA STEADY- GLO luciferase system and read using a PERKIN ELMER 2104 Multilabel Reader.
  • EBV-POBI tive Selective Killing Assay To determine if the compounds were selectively killing EBV-positive cells, the viability of EBV-positive cells (LCLs, Mutul, Raji) were compared with EBV-negative cells (DG75 or BCBL1) . Cells were resuspended at a concentration of 100,000 cells per milliliter and 40 ⁇ (40,000 cells) of the resuspension was dispensed to each well of a 384 -well clear plate. Test compounds (0.5 ⁇ ) were added to each well to achieve a final concentration range of 125 ⁇ 2 nM . After incubating the cells at 37°C for 72 hours with the compounds, the cells were analyzed using the PROMEGA MTS reagent and read using a PERKIN ELMER 2104 Multilabel Reader .
  • Xenograft Mouse Model Assay To test the efficacy of compounds in vivo, a xenograft mouse model was developed in an immunodeficient NOD SCID (NOD . CBl 7 -Prkdcscid/KicrCrl) mouse (The Jackson Laboratory) . Mutu LCL cells were transduced with a lentivirus (N1893) that constitutively expressed GFP and luciferase and sorted using a flow cytometer to isolate a population of cells that express GFP and luciferase.
  • NOD SCID NOD . CBl 7 -Prkdcscid/KicrCrl
  • Mutu LCL cells were transduced with a lentivirus (N1893) that constitutively expressed GFP and luciferase and sorted using a flow cytometer to isolate a population of cells that express GFP and luciferase.
  • Test compounds Five million transduced Mutu LCL GFP/luciferase-positive cells were suspended in 100 ⁇ sterile PBS and injected subcutaneously into the right flank of six week old female NOD SCID mice. Test compounds were formulated in vehicle (5% n-methylpyrollidone, 45% SOLUTOL HS 15, and 50% 1% LUTROL F 68 in water) and sterile filtered. Test compounds were dosed intraperitoneal once a day on days 7, 9, and 11.
  • tumor size was measured using the IVIS Imager.
  • each animal was anesthetized with isofluorane and injected intraperitoneal with 250 ⁇ of a 15 mg/ml stock of D-luciferin firefly, potassium salt (GOLD BIOTECHNOLOGY, #LUCK1G, dissolved in DPBS) per gram of body weight.
  • mice were placed in the XENOGEN IVIS imager (CALIPER LIFESCIENCES) and tumor size was read using total flux as the measurement value.

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Abstract

The present invention embraces compounds that modulate the activity of Epstein-Barr Nuclear Antigen 1 (BBNA1 ) protein and use thereof in methods for treating latent Epstein-Barr virus infection. R7 is a substituted or unsubstituted phenyl, pyridyl, or pyrimidinyl group. A pharmaceutical composition comprising a compound of the invention in admixture with a pharmaceutically acceptable carrier is also provide as are methods for modulating the activity of Epstein-Barr Nuclear Antigen 1 (EBNA1 ) protein and treating a latent EpsteinBarr virus infection with a composition of the present invention.

Description

COMPOSITIONS AND METHODS FOR MODULATING THE ACTIVITY OF EPSTEIN-BARR NUCLEAR ANTIGEN 1
Background of the Invention
[0001] This application claims the benefit of priority of U.S. Provisional Application No. 61/489,293 filed May 24, 2011, the content of which is incorporated herein by reference in its entirety.
[0002] Epstein-Barr virus (EBV) is a carcinogenic cofactor for several lymphoid and epithelial cell malignancies (Kieff (2007) Epstein-Barr Virus and its Replication, 5th ed. Wolters Kluwer Health/Lippincott Williams & Wilkins, Philadelphia; Rickinson & Kieff (2007) Epstein-Barr Virus, 5th ed. Wolters Kluwer Health/Lippincott Williams & Wilkins, Philadelphia; Young & Rickinson (2004) Nat. Rev. Cancer 4:757-68) . EBV is associated with the majority of endemic forms of Burkitt's lymphoma and nasopharyngeal carcinomas (NPC) . EBV is also found in -50% of all Hodgkin's disease tumor biopsies, some forms of gastric carcinoma, thyroid tumors, NK/T cell lymphoma, and the majority of immunosuppression-associated non-Hodgkin' s lymphomas and lymphoproliferative disease. Most EBV associated tumors harbor the latent viral genome as a multicopy episome in the nucleus of the transformed cells, During latent infection, EBV does not produce progeny virions, but does express a limited set of viral gene products that promote host -cell survival and proliferation. In proliferating cells, the maintenance of the latent viral genome depends on the functions of the Epstein-Barr Nuclear Antigen 1 (EBNA1) protein (height & Sugden (2000) Rev. Med. Virol. 10:83-100) . EBNA1 is expressed in all types of EBV latent infection found in proliferating cells and tumors. EBNA1 is essential for the immortalization of primary B lymphocytes by EBV infection (Humme, et al . (2003) Proc . Natl. Acad. Sci. USA 100:10989-94), and its inhibition by siRNA depletion or by ectopic expression of dominant negative mutants causes infected cells death (Kennedy, et al. (2003) Proc. Natl. Acad. Sci. USA 100:14269-14274; Yin & Flemington (2006) Virology 346 : 385-93) .
[ 0003 ] EBNAl is a candidate for targeting inhibition of EBV latent infection. EBNAl is consistently expressed in most, if not all, EBV-associated malignancies (Thorley-Lawson & Gross (2004) N. Engl. J. Med. 350:1328-37) . EBNAl is essential for viral genome maintenance and for infected- cell survival (Kennedy, et al . (2003) supra; Yin & Flemington (2006) supra) . Most importantly, EBNAl is a viral-encoded protein that has well-defined biochemical and structural properties. EBNAl is composed of two major functional domains, a carboxy-terminal DNA binding domain, and an amino-terminal chromosome tethering domain (Leight & Sugden (2000) supra; Wang, et al . (2006) Mol . Cell Biol. 26:1124-34) . The DNA binding domain is essential for interaction with the viral origin of plasmid replication (OriP) (Yates, et al . (1985) Nature 313 : 812-815) . OriP is composed of a series of 30 bp repeats to which EBNAl binds an 18 bp palindromic -sequence as a homodimer (Ambinder, et al. (1990) J. Virol. 64:2369-79 ; Rawlins, et al . (1985) Cell 42:859-68) . The DNA binding and dimerization interface have been solved by high resolution X-ray crystallography in the apo- and DNA-bound forms (Bochkarev, et al . (1996) Cell 84:791-800; Bochkarev, et al . (1995) Cell 83:39-46) . While there are no known cellular homologues of EBNAl, the three dimensional structure of EBNAl resembles the overall structure of human papillomavirus (HPV) E2 protein, which has an analogous function to EBNAl at the HPV origin of DNA replication (Bochkarev, et al . (1995) supra). Protein structure prediction programs suggest that EBNAl and E2 share structural folds similar to the Kaposi's Sarcoma Associated herpesvirus (KSHV) LANA protein, which shares many functional properties with EBNA1, including DNA binding and episome maintenance of KSHV oriP (Garber, et al . (2002) J". Biol, Chem. 277:27401-11) . These observations suggest that EBNA1 is a member of a family of viral origin binding proteins that have no apparent orthologue in the human genome, and therefore may represent attractive targets for inhibitors of viral latent replication and persistence .
[0004] Identification of small molecules that specifically inhibit protein-DNA binding activity has had some success
(Bowser, et al . (2007) Bioorg. Med. Chem. Lett. 17:5652-5;
Kiessling, et al . (2006) Chem. Biol. 13:745-51; Mao, et al .
(2008) J. Biol. Chem. 283:12819-30; Rishi, et al . (2005) Anal. Biochem. 340:259-71). Because of the cost-inefficient and time-consuming process of conventional drug discovery over the past decade, high throughput virtual screening
(HTVS) has emerged as an attractive and complementary approach to traditional HTS . HTVS typically depends on the availability of a high-resolution crystal structure of the protein target as a template for computational screening. Over the years, HTVS has been applied to the successful identifications of biologically active molecules against targets such as HIV-1 protease, thymidylate, influenza hemagglutinin, and parasitic proteases (Siddiquee, et al .
(2007) Proc. Natl. Acad. Sci . USA 104:7391-7396; Vangrevelinghe, et al . (2003) J. Med. Chem. 46:2656-2662) .
Summary of the Invention
[0005] The present invention features a compound of Formula I, II or III.
Figure imgf000005_0001
Formula I Formula II Formula III wherein
X is O or NH;
R1 is a substituted or unsubstituted phenyl, pyridyl or thiazole group.
R2 is =0 or 2H;
R3 is CR4, a substituted or unsubstituted pyridyl group, a pyrimidinyl group, a phenylmorpholine group; an
oxazole group, or
Figure imgf000005_0002
;
R4 is a substituted or unsubstituted phenyl group;
R5 and R6 are independently a halogen group, a substituted or unsubstituted lower alkyl group, or substituted or unsubstituted methoxy group, with the proviso that when R2 is =0 and Rs is H, R6 is not CI, C(CH3)3, or CF3; and
R7 is a substituted or unsubstituted phenyl, pyridyl, or pyrimidinyl group. A pharmaceutical composition comprising a compound of the invention in admixture with a pharmaceutically acceptable carrier is also provide as are methods for modulating the activity of Epstein-Barr Nuclear Antigen 1 (EBNA1) protein and treating a latent Epstein- Barr virus infection with a composition of the present invention. Detailed Description of the Invention
[0007] Flourescence polarization (FP) -based high throughput screening and electrophoresis mobility shift assays (EMSA) were conducted to identify small molecule inhibitors of Epstein-Barr Nuclear Antigen 1 (EBNAl) . Compounds identified in these assays were found to be highly selective inhibitors of EBNAl. These compounds, as well as analogs and derivatives thereof, serve as new EBNAl inhibitors for use as therapeutic agents against EBV. Accordingly, the present invention features the compounds identified herein and their use in treating a latent Epstein-Barr virus infection.
[0008] The compounds of the present invention were found to share a common benzofuran structure. More specifically, the compounds of the invention had the structures of Formula I, Formula II and Formula III.
Figure imgf000006_0001
Formula I Formula II Formula III wherein X is O or NH;
R1 is a substituted or unsubstituted phenyl, pyridyl or thiazole group.
R2 is =0 or 2H;
R3 is CR4, a substituted or unsubstituted pyridyl group, a pyrimidi a phenylmorpholine group; an
Figure imgf000006_0002
oxazole group, or
R4 is a substituted or unsubstituted phenyl group; R5 and R6 are independently a halogen group, a substituted or unsubstituted lower alkyl group, or substituted or unsubstituted methoxy group, with the proviso that when R2 is =0 and R5 is H, R6 is not Cl , C(CH3)3, or CF3; and
R7 is a substituted or unsubstituted phenyl, pyridyl, or pyriraidinyl group.
[0009] "Lower alkyl" is intended to mean a branched or unbranched saturated monovalent hydrocarbon radical containing 1 to 6 carbon atoms, such as methyl, ethyl, propyl, isopropyl, tert -butyl, butyl, n-hexyl and the like.
[00010] Exemplary substituent groups include, but are not limited to, halogen (i.e., fluorine, chlorine, bromine and iodine), lower alkyl, ethoxy, methoxy, hydroxyl, amine, amide, nitro, nitroso, aldehyde, carboxyl, sulhydryl, and carbonothioyl .
[00011] Exemplary compounds of Formula I, Formula II and Formula III are presented in Table 2. Such compounds can be prepared as pharmaceutical compositions, pharmaceutically acceptable derivatives, or pharmaceutically acceptable salts and be provided alone or in combination in the form of a kit with unit doses of the subject compounds. In such kits, in addition to the containers containing the unit doses will be an informational package insert describing the use and attendant benefits of using the compound (s).
[00012] A "pharmaceutically acceptable derivative" of a compound of the invention include salts, esters, enol ethers, enol esters, acetals, ketals, orthoesters, hemiacetals, hemiketals, acids, bases, solvates, hydrates or prodrugs thereof. Such derivatives may be readily prepared by those of skill in this art using known methods for such derivatization. The compounds produced may be administered to animals or humans without substantial toxic effects and either are pharmaceutically active or are prodrugs .
[00013] A "pharmaceutically acceptable salt" of a compound means a salt that is pharmaceutically acceptable and that possesses the desired pharmacological activity of the parent compound. Such salts include: (1) acid addition salts, formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like; or formed with organic acids such as acetic acid, propionic acid, hexanoic acid, cyclopentanepropionic acid, glycolic acid, pyruvic acid, lactic acid, malonic acid, succinic acid, malic acid, maleic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, 3- {4 -hydroxybenzoyl ) benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, 1,2-ethanedisulfonic acid, 2 -hydroxyethanesulfonic acid, benzenesulfonic acid, 4 -chlorobenzenesulfonic acid, 2-naphthalenesulfonic acid, 4-toluenesulfonic acid, camphorsulfonic acid, glucoheptonic acid, 4,4'- methylenebis- (3 -hydroxy-2 ~ene~l~carboxylic acid), 3- phenylpropionic acid, trimethylacetic acid, tertiary butylacetic acid, lauryl sulfuric acid, gluconic acid, glutamic acid, hydroxynaphthoic acid, salicylic acid, stearic acid, muconic acid, and the like; or (2) salts formed when an acidic proton present in the parent compound either is replaced by a metal ion, e.g., an alkali metal ion, an alkaline earth ion, or an aluminum ion; or coordinates with an organic base such as ethanolamine , diethanolamine , triethanolamine , tromethamine , N- methylglucamine , and the like.
[00014] In addition to the compounds specifically disclosed herein, the present invention also pertains to analogs and derivatives of said compounds that modulate EBNAl activity. Broadly, the EBNAl three-dimensional crystal structure in combination with the structure of the instant compounds can be used to design or screen for a test compound with EBNAl inhibitory activity; and the compound designed or screened for can be tested for its ability to modulate the activity of EBNAl. In certain embodiments, the screening is carried out using various in silico, in vitro and/or in vivo assays based on detecting interactions between the DNA binding domain or residues of the DNA binding domain of EBNAl and a test compound.
[00015] In the context of the present invention, EBNAl refers to the Epstein-Barr Nuclear Antigen 1 protein. EBNAl is described, e.gr., in GENBAN Accession No. YP_401677, and set forth herein in SEQ ID NO : 1. Full-length EBNAl protein can be used in accordance with this invention or alternatively, the DNA binding domain of EBNAl can be used (i.e., amino acid residues 454 to 607) . For the purposes of the present invention, reference to EBNAl also includes synthetic variants of EBNAl, as well as fragments of EBNAl, Synthetic variants include those which have at least 80%, preferably at least 90%, homology to EBNAl disclosed herein and possess the ability to bind DNA. More preferably, such variants correspond to the sequence of EBNAl provided herein, but have one or more, e.g., from 1 to 10, or from 1 to 5 substitutions, deletions or insertions of amino acids. Fragments of EBNAl and variants thereof are preferably between 100 and 500 amino acid residues in length or between 150 and 300 amino acids in length. An exemplary fragment includes the approximately 150 amino acid residues encompassing the DNA binding domain of EBNAl.
[00016] In accordance with the present invention, molecular design techniques can be employed to design, identify and synthesize analogs and derivatives, including inhibitory and stimulatory compounds, capable of binding to one or more amino acids of the DNA binding pocket of EBNAl . The structure of the DNA binding pocket of EBNAl can be used in conjunction with computer modeling using a docking program such as GRAM, DOCK, HOOK or AUTODOCK (Dunbrack, et al . (1997) FoldingSc Design 2:27-42) to identify potential modulators of EBNAl protein. This procedure can include computer fitting of compounds to the DNA binding pocket of EBNAl to, e.g., ascertain how well the shape and the chemical structure of the compound will complement the DNA binding domain; or to compare the compound with the binding of an inhibitor disclosed herein. Computer programs can also be employed to estimate the attraction, repulsion and stearic hindrance of the EBNAl protein and effector compound. Generally, the tighter the fit, the lower the stearic hindrances, the greater the attractive forces, and the greater the specificity, which are important features for a specific effector compound which is more likely to interact with the EBNAl protein rather than other classes of proteins .
[00017] A chemical-probe approach can be alternatively or additionally be employed in the design of EBNAl modulators or effectors. For example, Goodford ((1985) J". Med. Chem. 28:849) describes several commercial software packages, such as GRID (Molecular Discovery Ltd., Oxford, UK), which can be used to probe the EBNAl DNA binding domain with different chemical probes, e.g. , water, a methyl group, an amine nitrogen, a carboxyl oxygen, and a hydroxyl . Favored sites for interaction between the EBNAl DNA binding domain and each probe are thus determined, and from the resulting three-dimensional pattern a putative complementary molecule can be generated. [ 00018 ] Analogs and derivatives of the compounds of the present invention can also be designed by visually inspecting the three-dimensional structure of the EBNA1 DNA binding domain to determine more effective inhibitors or activators. This type of modeling is generally referred to as "manual" drug design. Manual drug design can employ visual inspection and analysis using a graphics visualization program such as "0" (Jones, et al . (1991) Acta Crystallographica Section A A47 : 110-119) . Initially effector compounds are selected by manual drug design. The structural analog thus designed can then be modified by computer modeling programs to better define the most likely effective candidates. Reduction of the number of potential candidates is useful as it may not be possible to synthesize and screen a countless number of compound variations that may have some similarity to known inhibitory molecules. Such analysis has been shown effective in the development of HIV protease inhibitors (Lam, et al . (1994) Science 263:380-384; Wlodawer, et al . (1993) Ann. Rev. Biochem. 62:543-585; Appelt (1993) Perspectives in Drug Discovery and Design 1:23-48; Erickson (1993) Perspectives in Drug Discovery and Design 1:109- 128) .
[ 00019 ] Programs suitable for searching three-dimensional databases include MACCS-3D and ISIS/3D (Molecular Design Ltd, San Leandro, CA) , ChemDBS-3D (Chemical Design Ltd., Oxford, UK), and Sybyl/3 DB Unity (Tripos Associates, St Louis, MO) . Programs suitable for compound selection and design include, e.g., DISCO (Abbott Laboratories, Abbott Park, IL) , Catalyst {Bio-CAD Corp., Mountain View, CA) , and ChemDBS-3D (Chemical Design Ltd., Oxford, UK) .
[ 00020 ] Analogs and derivatives of the compounds of the present invention can bind to all or a portion of the DNA binding domain of EBNAl and may be more potent, more specific, less toxic and more effective than the instant compounds. The designed compounds can also be less potent but have a longer half- life in vivo and/or in vitro and therefore be more effective at modulating EBNAl activity in vivo and/or in vitro for prolonged periods of time. Such designed modulators are useful to activate EBNAl or inhibit EBNAl activity to, e . g. , prevent tumor formation.
[00021] The present invention also provides the use of molecular design techniques to computationally screen small molecule databases for chemical entities or compounds that can bind to EBNAl in a manner analogous to its natural substrates and/or compounds disclosed herein. Such computational screening can identify various groups which interact with one or more amino acid residues of the DNA binding domain and can be employed to synthesize modulators of the present invention.
[00022] In vitro (i.e., in solution) screening assays are also embraced by the present invention. For example, such assays include combining EBNAl or the EBNAl DNA binding domain (e.g., as disclosed herein), with or without substrates (e.g., a DNA probe) in solution and determining whether an analog or derivative can block or enhance EBNAl DNA binding activity. In this respect, in vitro screening assays can be carried out to monitor DNA binding in the presence or absence of an analog or derivative. In accordance with this aspect of the invention, the present invention embraces the use of a FP-based assay and/or E SA to demonstrate binding of an analog or derivative to the DNA binding domain of EBNAl . Such assays are routinely practiced in the art and disclosed in more detail herein.
[00023] After designing or screening for an analog or derivative, the analog or derivative is subsequently tested for its ability to modulate the activity of EBNA1 in vivo. This can be carried out using conventional assays such as the cell-based reporter assay disclosed herein or by determining EBV genome copy number maintenance.
[ 00024 ] To further evaluate the efficacy of a compound, analog or derivative of the invention, one of skill will appreciate that a model system of any particular disease or disorder involving latent EBV infection can be utilized to evaluate the adsorption, distribution, metabolism and excretion of a compound as well as its potential toxicity in acute, sub-chronic and chronic studies. For example, the effector or modulatory compound can be tested in the model disclosed in Example 2, the EBV model using beige/nude/xid mice carrying human lymphoid xenografts (Dosch, et al .
(1991) Internation. Immunol. 3:731-35) or SCID mice engrafted with human lymphocytes (Rowe, et al . (1991) J". Exp. Med. 173:147-158) . Ultimately, the safety and efficacy of compounds of the invention are evaluated in human clinical trials.
[ 00025 ] Compounds of this invention have a variety of uses. EBNA1 protein is expressed in all EBV-associated tumors, where it is indispensable for viral replication, genome maintenance and viral gene expression. EBNA1 ' transcription factor- like functions also extend to influencing the expression of cellular genes involved in pathways commonly dysregulated during oncogenesis. Therefore, in one embodiment inhibitors of EBNA1 DNA binding activity inhibit viral replication by disruption of EBNA1 DNA binding. In many cases, inhibition of viral replication equates with inhibition of tumor formation. Therefore, inhibitors of EBNA1 DNA binding activity will be effective therapeutic agents for treatment of human diseases or conditions caused by EBV latent infection, in particular EBV-associated tumors. In addition to the regulation of viral genes, EBNAl has been shown to regulate host cell gene expression. For example, EBNAl has been shown to induce the expression of CD25, RAG1, RAG2 and CCL20 in B-cells (Baumforth, et al . (2008) Am. J. Pathol. 173:195-204; Kube, et al . (1999) J. Virol. 73:1630-1636; Srinivas & Sixbey (1995) J. Virol. 69:8155-8158), and the differential regulation of cellular genes involved in translation, transcription and cell signaling in epithelial cells (O'Neil, et al . (2008) J. Gen. Virol. 89:2833-2842; Wood, et al. (2007) Oncogene 26:4135-4147). Furthermore, EBNAl enhances STAT1 expression which sensitizes cells to interferon-induced STAT1 activation, modulates signaling in the GF i pathway, and increases AP-1 activity resulting in the enhancement of host cell mechanisms involved in angiogenesis and metastasis (O'Neil, et al . (2008) supra; Wood, et al . (2007) supra). Accordingly, compounds that activate EBNAl are of use in inducing the lytic cycle of EBV to study pathogenesis and analyze the effect of EBNAl on host cell gene expression. In general, the molecules of the invention can be used whenever it is desired to increase or decrease EBNAl activity in a cell or organism,
[ 00026 ] Therefore, the compounds, analogs and derivatives of the present invention find application in a method for modulating (i.e., blocking or inhibiting, or enhancing or activating) EBNAl. Such a method involves contacting EBNAl either in vitro or in vivo with an effective amount of a compound, analog or derivative of the invention so that the activity of EBNAl is modulated. An effective amount of an effector or modulatory compound is an amount which reduces or increases the activity of the EBNAl by at least 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% when compared to EBNAl not contacted with the compound. Such activity can be raonitored by reporter-based assays for detecting activity of the EBNA1 or in competitive binding assays with a DNA substrate. Compounds particularly embraced by the invention are provided herein in the Examples.
[00027] One of skill in the art can appreciate that modulating the activity of EBNA1 can be useful in selectively analyzing EBNA1 signaling events in model systems as well as in preventing or treating diseases, conditions, and disorders involving EBNA1 latent infection. The selection of the compound for use in preventing or treating a particular disease or disorder will be dependent upon the particular disease or disorder. For example, EBNA1 is involved in cancer and therefore a compound which inhibits EBNA1 will be useful in the prevention or treatment of cancer including, but not limited to Burkitt's lymphoma, nasopharyngeal carcinoma, Hodgkin ' s lymphoma, post- transplant lymphoproliferative disease, some forms of gastric carcinoma, thyroid tumors, NK/T cell lymphoma, and immunosuppression-associated non-Hodgkin' s lymphomas. Moreover, EBV has been suspected to have a role in the pathogenesis of chronic fatigue syndrome (Lerner, et al . (2004) In Vivo 18:101-6), such that inhibition of EBNA1 may be of use in treating this condition as well .
[00028] Accordingly, the present invention also provides a method for preventing or treating a latent Epstein-Barr virus infection. Such treatment involves administering to a subject in need of treatment a pharmaceutical composition containing an effective amount of an EBNA1 inhibitory compound disclosed herein (see, e.g., Table 2) . In most cases this will be a human being, but treatment of agricultural animals, e.g. , livestock and poultry, and companion animals, e.g., dogs, cats and horses, is expressly covered herein. [00029] As used herein the terms "treating" and "treatment" refer to any and all uses which remedy a condition or symptoms, prevent the establishment of a condition or disease, or otherwise prevent, hinder, retard, or reverse the progression of a condition or disease or other undesirable symptoms .
[00030] As used herein the term "effective amount" includes within its meaning a non- toxic but sufficient amount of an agent or compound to provide the desired effect. The exact amount required will vary from subject to subject depending on factors such as the species being treated, the age and general condition of the subject, the severity of the condition being treated, the particular agent being administered and the mode of administration and so forth. In this respect, for any given case, an appropriate "effective amount" may be determined by one of ordinary skill in the art using only routine experimentation.
[00031] Pharmaceutical compositions containing a compound of the invention can be in the form of pharmaceutically acceptable salts and complexes and can be provided in a pharmaceutically acceptable carrier and at an appropriate dose. Such pharmaceutical compositions can be prepared by methods and contain carriers which are well-known in the art. A generally recognized compendium of such methods and ingredients is Remington: The Science and Practice of Pharmacy, Alfonso R. Gennaro, editor, 20th ed . Lippincott Williams & ilkins : Philadelphia, PA, 2000. A pharmaceutically-acceptable carrier, composition or vehicle, such as a liquid or solid filler, diluent, excipient, or solvent encapsulating material, is involved in carrying or transporting the subject compound from one organ, or portion of the body, to another organ, or portion of the body. Each carrier must be acceptable in the sense of being compatible with the other ingredients of the formulation and not injurious to the subject being treated.
[00032] Examples of materials which can serve as pharmaceutically acceptable carriers include sugars, such as lactose, glucose and sucrose; starches, such as corn starch and potato starch; cellulose, and its derivatives, such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; powdered tragacanth; malt; gelatin; talc; excipients, such as cocoa butter and suppository waxes; oils, such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil,- corn oil and soybean oil; glycols, such as propylene glycol; polyols, such as glycerin, sorbitol, mannitol and polyethylene glycol; esters, such as ethyl oleate and ethyl laurate; agar; buffering agents, such as magnesium hydroxide and aluminum hydroxide; alginic acid; pyrogen-free water; isotonic saline; Ringer's solution; ethyl alcohol; pH buffered solutions; polyesters, polycarbonates and/or polyanhydrides ; and other non-toxic compatible substances employed in pharmaceutical formulations. Wetting agents, emulsifiers and lubricants, such as sodium lauryl sulfate and magnesium stearate, as well as coloring agents, release agents, coating agents, sweetening, flavoring and perfuming agents, preservatives and antioxidants can also be present in the compositions .
[00033] The compositions of the present invention can be administered parenterally (for example, by intravenous, intraperitoneal, subcutaneous or intramuscular injection), topically (including buccal and sublingual) , orally, intranasally, intravaginall , or rectally according to standard medical practices .
[00034] The selected dosage level will depend upon a variety of factors including the activity of the particular compound of the present invention employed, the route of administration, the time of administration, the rate of excretion or metabolism of the particular compound being employed, the duration of the treatment, other drugs, compounds and/or materials used in combination with the particular compound employed, the age, sex, weight, condition, general health and prior medical history of the patient being treated, and like factors well known in the medical arts .
[00035] A physician or veterinarian having ordinary skill in the art can readily determine and prescribe the effective amount of the pharmaceutical composition required. For example, the physician or veterinarian could start doses of a compound at levels lower than that required in order to achieve the desired therapeutic effect and gradually increase the dosage until the desired effect is achieved. This is considered to be within the skill of the artisan and one can review the existing literature on a specific compound or similar compounds to determine optimal dosing.
[00036] In addition to the treatment of EBV latent infection, it is envisioned that the compounds disclosed herein will be equally suitable for inhibition of other viruses with similar DNA binding domains. For example, EBNAl resembles the overall structure of human papillomavirus (HPV) E2 protein, which has an analogous function to EBNAl at the HPV origin of DNA replication (Bochkarev, et al . (1995) supra). Protein structure prediction programs indicate that EBNAl and E2 share structural folds similar to the Kaposi's Sarcoma Associated herpesvirus (KSHV) LANA protein, which shares many functional properties with EBNAl, including DNA binding and episome maintenance of KSHV oriP (Garber, et al . {2002} supra) . Therefore, effectors identified in accordance with the method disclosed herein may also be useful in modulating the activity of LANA and E2 proteins, as well as in the treatment of diseases associated with KSHV and HPV.
[00037] The invention is described in greater detail by the following non-limiting examples.
Example It Parallel Synthesis of Compounds
Figure imgf000019_0001
SCHEME 1
Figure imgf000019_0002
Figure imgf000019_0003
Figure imgf000020_0001
SCHEME 4
Figure imgf000020_0002
SCHEME 5
Figure imgf000020_0003
SCHEME 6
Figure imgf000020_0004
SCHEME 7 [ 00038 ] Substituents of the compounds synthesized according
Schemes 1-7 are listed in Table
Figure imgf000021_0001
[ 00039 ] In addition to 3 -nitro-benzofurans , other core structures are also contemplated including, but not limited to, the following structures.
Figure imgf000021_0002
Figure imgf000022_0001
Example 2 : Materials and Methods
[00040] Expression and Purification of Recombinant EBNA1 DBD. Amino acids 454 to 607 of EBNA1 (GENBANK Accession No. YP_401677; SEQ ID NO:l) , encoding the DNA binding domain were expressed as a hexa-histidine fusion protein in Ε.· coli . Expression was induced in Rosetta2 cells with 0.3 mM IPTG for 3 hours at 25°C. Soluble protein was recovered and purified via Ni-NTA agarose according to standard methods (Frangioni & Neel (1993) Anal. Bioche , 210:179-87) . Bound protein was extensively washed with 20 mM HEPES, pH 7.9, 1 M NaCl, 5 mM 2 -mercaptoethanol , 40 mM imidazole and 10% glycerol to dissociate nonspecific DNA bound to EBNA1 prior to elution in buffer containing 250 mM imidazole. Peak fractions of the eluted proteins were pooled and dialyzed against 20 mM HEPES, pH 7.9, 500 mM NaCl, 5 mM 2- mercaptoethanol , 10% glycerol, and 0.2 mM PMSP.
[00041] FP Assay. The FP assay employed a probe with a non- palindromic site having two high-affinity half sites (5'- GGG TAG CAT ATG CTA TCT aga tag cat atg eta ccc-3'; SEQ ID NO: 2) . This probe bound EBNA1 with similar efficiency in EMSA (electrophoretic mobility shift assay) , but performed significantly better in the FP (fluorescence polarization,) assay. A reaction mix was prepared containing 200 mM NaCl, 20 mM Tris-Cl pH 7,4, 1 mM DTT, 10 g/mL BSA, and 5 nM CY5~ labeled EBNA1 BS Hairpin (opl 3016} or 5 nM FITC-labeled EBNA1 BS Hairpin (opl 4624} , with or without 246 to 100 nM purified EBNA1 DNA Binding Domain. This solution was incubated for 30 minutes at room temperature to ensure binding. Thirty of this solution was dispensed to each well of the test plate with the compounds using a BIOTEK MICROFLO Select Dispenser. The plate was then centrifuged at 165 x g to ensure the solution settled in the wells and incubated for 30 minutes at 25°C. The plate was then analyzed using a PERKIN ELMER 2104 Multilabel Reader.
[00042] EMSA Assay. An EMSA reaction buffer was prepared containing 20% glycerol, 200 mM NaCl, 20 mM Tris-Cl pH 7.4, 1 mM DTT, 10 μg/mL BSA, and 10 nM CY5-labeled EBNA1 BS Hairpin (opl 3016) , with or without 246 nM purified EBNA1 DNA Binding Domain. This solution was incubated for 20 minutes at room temperature to ensure binding. Thirty L of this solution was dispensed to EPPENDORF tubes containing 0.5 μL of a test compound in DMSO and subsequently mixed. Samples were then loaded onto a 6% polyacrylamide gel and electrophoresed for 90 minutes at 170V. The gel was then scanned for fluorescence using a General Electric TYPHOON Imager .
[00043] FP Screening. For initial screening, 2 μΐ of test compounds resuspended in DMSO were plated in triplicate wells in a black PERKIN ELMER OPTIPLATE at a concentration of 50 mM to achieve a final concentration of 3.33 mM when resuspended in 30 L of reaction solution. The plate was assayed using the FP assay described herein. Specifically, 30 μΐ of a preformed EBNA1 : CY5- or FITC-DNA hairpin complex was dispensed to wells containing candidate compounds. After a 1 hour incubation at room temperature, fluorescence polarization (EX: 620, EM: 680) was measured using an ENVISION XCITE Multilabel Reader (PERKIN ELMER) . Percent inhibition of EBNA1 DNA binding was calculated for each compound relative to assay plate control wells (i.e., % inhibition = (mPMax-mPcmPd) / (mPMax-mPmin) x 100) . Upon deconvulution, results were stratified into four categories: actives (i.e., the bioactive compound displayed >15% inhibition of EBNAl DNA binding and cleanly mapped to a unique well in both the horizontal and vertical dimensions), ambiguous (i.e., the bioactive compound mapped to 2 or more wells in either dimension), orphan (i.e., an orthogonal match could not be identified in the second dimension) , and inactive (<15% inhibition of EBNAl DNA binding activity) .
[ 00044 ] ICso Determination. To determine IC50 values, a 10- point 3-fold titration of each compound in 100% (v/v) DMSO was performed in duplicate starting at an initial concentration of 10 mM using a PER IN ELMER JANUS to create a master plate. From this master plate, 0.5 L was transferred to black PERKIN ELMER OPTIPLATE test plates with a PERKIN ELMER JANUS or to EPPENDORF tubes manually. The plate was assayed using the FP assay herein and the tubes assayed using the EMSA protocol described above.
[ 00045 ] EBNAl Transcription Derepression Assay. 293T cells were seeded in 10-cm plates in DMEM media with 10% FBS . Following a 18-hour incubation at 37°C to allow cells to adhere, cells at 50-70% confluence were transfected using 40 L LIPOFECTAMINE (INVITROGEN) per plate. The cells were transfected with a 4 μg Qp-luciferase reporter plasmid (N1852) and 0.125 EBNAl expression plasmid (N803) or 4
Ug Qp-luciferase reporter plasmid (N1852) and 0.125 μg control plasmid (N799) (no EBNA) per plate. After 24 hours, the cells were harvested without trypsin, centrifuged 1200 RPM for 5 minutes and resuspended in DMEM media with 10% FBS at a concentration 100,000 cells per milliliter. Forty L of this solution (40,000 cells) was dispensed to each well of the white plate using a BIOTEK MICROFLO Select Dispenser. Test compounds were added to achieve a final concentration range of 125 μΜ-2 nM, as described above. Cells were incubated at 37°C for 48 hours, harvested and analyzed for luciferase activity using the PROMEGA STEADY- GLO luciferase system and read using a PERKIN ELMER 2104 Multilabel Reader.
[00046] EBV-POBI tive Selective Killing Assay. To determine if the compounds were selectively killing EBV-positive cells, the viability of EBV-positive cells (LCLs, Mutul, Raji) were compared with EBV-negative cells (DG75 or BCBL1) . Cells were resuspended at a concentration of 100,000 cells per milliliter and 40 μΐ (40,000 cells) of the resuspension was dispensed to each well of a 384 -well clear plate. Test compounds (0.5 μΐ) were added to each well to achieve a final concentration range of 125 μΜ~2 nM . After incubating the cells at 37°C for 72 hours with the compounds, the cells were analyzed using the PROMEGA MTS reagent and read using a PERKIN ELMER 2104 Multilabel Reader .
[00047] Xenograft Mouse Model Assay. To test the efficacy of compounds in vivo, a xenograft mouse model was developed in an immunodeficient NOD SCID (NOD . CBl 7 -Prkdcscid/KicrCrl) mouse (The Jackson Laboratory) . Mutu LCL cells were transduced with a lentivirus (N1893) that constitutively expressed GFP and luciferase and sorted using a flow cytometer to isolate a population of cells that express GFP and luciferase. Five million transduced Mutu LCL GFP/luciferase-positive cells were suspended in 100 μΐ sterile PBS and injected subcutaneously into the right flank of six week old female NOD SCID mice. Test compounds were formulated in vehicle (5% n-methylpyrollidone, 45% SOLUTOL HS 15, and 50% 1% LUTROL F 68 in water) and sterile filtered. Test compounds were dosed intraperitoneal once a day on days 7, 9, and 11. On days 9, 14, 18, 21, 23, and 25, tumor size was measured using the IVIS Imager, For these measurements each animal was anesthetized with isofluorane and injected intraperitoneal with 250 μΐ of a 15 mg/ml stock of D-luciferin firefly, potassium salt (GOLD BIOTECHNOLOGY, #LUCK1G, dissolved in DPBS) per gram of body weight. After 20 minutes, mice were placed in the XENOGEN IVIS imager (CALIPER LIFESCIENCES) and tumor size was read using total flux as the measurement value.
Example 3: Activity of Compounds
[00048] Compounds were screened for activity in the cell- based assay disclosed herein. The ICS0 values of the compounds are listed in Table 2.
TABLE 2
Figure imgf000026_0001
Figure imgf000027_0001
-27-
Figure imgf000028_0001
Figure imgf000029_0001
Figure imgf000030_0001
Figure imgf000031_0001

Claims

What is claimed is:
1. A compound of Formula I
Figure imgf000032_0001
Formula I
wherein
X is O or NH; and
R1 is a substituted or unsubstituted phenyl, pyridyl or thiazole group.
2. A compound of Formula II
Figure imgf000032_0002
Formula II
wherein
R2 is =0 or 2H;
R3 is CR4, a substituted or unsubstituted pyridyl group, a pyrimidi a phenylmorphoiine group; an
Figure imgf000032_0003
oxazole group, or ;
R4 is a substituted or unsubstituted phenyl group; and
R5 and Rs are independently a halogen group, a substituted or unsubstituted lower alkyl group, or substituted or unsubstituted methoxy group, with the proviso that when R2 is =0 and R5 is H, R6 is not Cl, C(CH3)3, or CF3.
3. A compound of Formula III
Figure imgf000033_0001
Formula III
wherein R7 is a substituted or unsubstituted phenyl , pyridyl , or pyrimidinyl group.
4. A pharmaceutical composition comprising a compound of claim 1, 2 or 3 in admixture with a pharmaceutically acceptable carrier.
5. A method for modulating the activity of Epstein- Barr Nuclear Antigen 1 (EBNAl) protein comprising contacting an EBNAl protein with an effective amount of a compound of claim 1, 2 or 3 so that the activity of the EBNAl protein is modulated.
6. A method for treating a latent Epstein-Barr virus infection comprising administering to a subject in need of treatment a pharmaceutical composition of claim 4 so that the subject's latent Epstein-Barr virus infection is treated .
7. The method of claim 6, wherein the latent Epstein- Barr virus infection is associated with cancer.
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