JP7157164B2 - アルファ溶血素バリアントおよびその使用 - Google Patents
アルファ溶血素バリアントおよびその使用 Download PDFInfo
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- JP7157164B2 JP7157164B2 JP2020544811A JP2020544811A JP7157164B2 JP 7157164 B2 JP7157164 B2 JP 7157164B2 JP 2020544811 A JP2020544811 A JP 2020544811A JP 2020544811 A JP2020544811 A JP 2020544811A JP 7157164 B2 JP7157164 B2 JP 7157164B2
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- hemolysin
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- C07K14/31—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Micrococcaceae (F) from Staphylococcus (G)
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Description
[0023]本明細書において示している見出しは、本発明の様々な態様または実施形態を限定するものではなく、本発明は、明細書を全体として参照によって理解され得る。したがって、直下で定義する用語は、明細書を全体として参照によってより充分に定義される。
[0024]アルファ溶血素:本明細書において使用する場合、「アルファ溶血素」、「α-溶血素」、「a-HL」および「α-HL」は、互換的に使用され、モノマー、モノマーのコンカテマーまたはモノマーおよびモノマーのコンカテマーの組合せから、七量体の水が満たされた膜貫通チャネルに自己構築する単量体タンパク質を指す(すなわち、ナノポア)。文脈に応じて、この用語はまた、7つの単量体タンパク質によって形成された膜貫通チャネルを指す場合もある。
[0049]本明細書および特許請求の範囲において、アミノ酸残基の従来の1文字表記および3文字表記を使用する。
Val149LysまたはV149K
複数の変異は、+記号によって分けられる、例えば、それぞれ、リジンをアラニンと、リジンをアスパラギンと、およびアルギニンをグルタミン酸と置換する位置1、47および287における変異を表す:
Ala1Lys+Asn47Lys+Glu287ArgまたはA1K+N47K+E287R
アミノ酸置換のスパンは、ダッシュによって表される、例えば、残基127~131のグリシン残基のスパンである:127-131Glyまたは127-133G。
[0051]黄色ブドウ球菌(Staphylococcus aureus)アルファ溶血素野生型配列は、本明細書において示しており(配列番号1、核酸コード配列;配列番号14、最初のメチオニンを含まないタンパク質配列)、他の場所で入手可能である(National Center for BioinformaticsまたはGenBank受入番号M90536およびAAA26598)。
[0054]本明細書において提供されるアルファ溶血素バリアントは、ナノポアベースのシーケンシング反応において通り抜ける時間を改善する特定の置換または1つもしくは複数の置換の組合せを含む。通り抜ける時間を改善することによって、決定された配列に、より少ない欠失しか伴わない、高精度DNAシーケンシングを達成できる。
A1K+N47K+E287R、
A1K+N47K、
D4K+N47K+E287R、
V149K+N47K+E11N+K147N+127-131G、
V149K+N47K、
V149K+D4K+N47K、
A1R、
D4N+A1K、
D128K+A1K、
K8R+V149K、
0K+V149K、
0K+A1K、
S3K+S106K。
このような組合せはまた、例えば、配列番号14のH144Aでの置換および/または配列番号14のアミノ酸127~131での一連のグリシン残基を含み得る。特定の例示的実施形態では、α-溶血素バリアントは、配列番号4、配列番号5、配列番号6、配列番号7、配列番号8、配列番号9、配列番号10、配列番号11、配列番号12、配列番号13、配列番号17、配列番号18または配列番号19として示されるアミノ酸配列に対して少なくとも80%、90%、95%、98%、99%またはそれ以上の配列同一性を有するアミノ酸配列を含み、各配列において同定される、例えば、バリアントにおいて保存されている置換を有する。
[0061]本明細書において記載する方法は、ポリメラーゼがナノポアに付いたナノポアを使用することができる。特定の例示的な実施形態においては、(例えば、各ナノポアで1つのみの核酸分子がシーケンシングされるように)ナノポア1つ当たりただ1つのポリメラーゼを有することが望ましい。しかしながら、アルファ溶血素(a-HL)を含めた多くのナノポアは、複数のサブユニット(例えば、a-HLでは7サブユニット)を有する多量体タンパク質であり得る。サブユニットは、同じポリペプチドの同一複製物であり得る。本明細書においては、無改変サブユニット(例えば、a-HL)に対する改変サブユニット(例えば、a-HLバリアント)の規定された比を有する多量体タンパク質(例えば、ナノポア)を提供する。
100Pm=100[n!/m!(n-m)!]・fmut m・fwt n~m、式中
Pm=m個の変異体サブユニットを有する細孔の確率
n=サブユニットの総数(例えば、aHLでは7個)
m=「変異体」サブユニットの数
fmut=一緒に混合した変異体サブユニットの割合または比
fwt=一緒に混合した野生型サブユニットの割合または比
[0073]特定の例示的な実施形態においては、ポリメラーゼ(例えば、DNAポリメラーゼ)は、ナノポアに付けられ、かつ/または、ナノポアの近傍に配置される。DNA合成反応の間にDNAを合成可能な任意のDNAポリメラーゼを、本明細書において記載される方法および組成物と一致して使用できる。例示的DNAポリメラーゼとして、それだけには限らないが、phi29(バチルスバクテリオファージφ29)、pol6(クロストリジウム(Clostridium)ファージphiCPV4;GenBank:AFH27113.1)またはpol7(アクチノマイセス(Actinomyces)ファージAv-1;GenBank:ABR67671.1)が挙げられる。特定の例示的実施形態では、リガーゼ、ヌクレアーゼ、ホスファターゼ、キナーゼ、トランスフェラーゼまたはトポイソメラーゼなどのDNA操作酵素または修飾酵素をナノポア構築体に付ける。
[0088]ナノポアは、集積回路などの検出回路の検出電極に隣接して配置された膜に形成するか、または他の方法で埋め込んでもよい。集積回路は、特定用途向け集積回路(ASIC)としてもよい。一部の例においては、集積回路は、電界効果トランジスターまたは相補型金属酸化膜半導体(CMOS)である。検出回路は、ナノポアを有するチップもしくは他のデバイスに位置するか、または、チップもしくはデバイスの外部に、例えばオフチップ配置などで位置することができる。半導体は任意の半導体とすることができ、IV族半導体(例えば、ケイ素)、およびIII-V族半導体(例えば、ヒ化ガリウム)が含まれるが、これらに限定されない。ヌクレオチドまたはタグを検出するための装置およびデバイスのセットアップについては、例えば、WO2013/123450を参照のこと。
発現および回収
[0093]この実施例は、細菌宿主細胞、例えば、大腸菌(E.coli)に由来するタンパク質の発現および回収を例示する。
アルファ溶血素バリアント
[0100]以下の実施例は、所望の残基での変異の導入を詳述する。
バリアントを含むナノポアの構築
[0103]この実施例は、6つのa-HLバリアントサブユニットおよび1つの野生型サブユニットを含むナノポアの構築を説明する。
ポリメラーゼの取付け
[0110]この実施例は、ナノポアへのポリメラーゼの取付けを提供する。
バリアントの活性
[0114]この実施例は、実施例4(ポリメラーゼが付けられたナノポア)によって提供されるようなナノポアの活性を示す。
配列番号1(WT aHL DNA)
ATGGCAGATC TCGATCCCGC GAAATTAATA CGACTCACTA TAGGGAGGCC 50
ACAACGGTTT CCCTCTAGAA ATAATTTTGT TTAACTTTAA GAAGGAGATA 100
TACAAATGGA TTCAGATATT AATATTAAAA CAGGTACAAC AGATATTGGT 150
TCAAATACAA CAGTAAAAAC TGGTGATTTA GTAACTTATG ATAAAGAAAA 200
TGGTATGCAT AAAAAAGTAT TTTATTCTTT TATTGATGAT AAAAATCATA 250
ATAAAAAATT GTTAGTTATT CGTACAAAAG GTACTATTGC AGGTCAATAT 300
AGAGTATATA GTGAAGAAGG TGCTAATAAA AGTGGTTTAG CATGGCCATC 350
TGCTTTTAAA GTTCAATTAC AATTACCTGA TAATGAAGTA GCACAAATTT 400
CAGATTATTA TCCACGTAAT AGTATTGATA CAAAAGAATA TATGTCAACA 450
TTAACTTATG GTTTTAATGG TAATGTAACA GGTGATGATA CTGGTAAAAT 500
TGGTGGTTTA ATTGGTGCTA ATGTTTCAAT TGGTCATACA TTAAAATATG 550
TACAACCAGA TTTTAAAACA ATTTTAGAAA GTCCTACTGA TAAAAAAGTT 600
GGTTGGAAAG TAATTTTTAA TAATATGGTT AATCAAAATT GGGGTCCTTA 650
TGATCGTGAT AGTTGGAATC CTGTATATGG TAATCAATTA TTTATGAAAA 700
CAAGAAATGG TTCTATGAAA GCAGCTGATA ATTTCTTAGA TCCAAATAAA 750
GCATCAAGTT TATTATCTTC AGGTTTTTCT CCTGATTTTG CAACAGTTAT 800
TACTATGGAT AGAAAAGCAT CAAAACAACA AACAAATATT GATGTTATTT 850
ATGAACGTGT AAGAGATGAT TATCAATTAC ATTGGACATC AACTAATTGG 900
AAAGGTACAA ATACTAAAGA TAAATGGACA GATAGAAGTT CAGAAAGATA 950
TAAAATTGAT TGGGAAAAAG AAGAAATGAC AAATGGTCTC AGCGCTTGGA 1000
GCCACCCGCA GTTCGAAAAA TAA 1023
MADSDINIKT GTTDIGSNTT VKTGDLVTYD KENGMHKKVF YSFIDDKNHN 50
KKLLVIRTKG TIAGQYRVYS EEGANKSGLA WPSAFKVQLQ LPDNEVAQIS 100
DYYPRNSIDT KEYMSTLTYG FNGNVTGDDT GKIGGLIGAN VSIGHTLKYV 150
QPDFKTILES PTDKKVGWKV IFNNMVNQNW GPYDRDSWNP VYGNQLFMKT 200
RNGSMKAADN FLDPNKASSL LSSGFSPDFA TVITMDRKAS KQQTNIDVIY 250
ERVRDDYQLH WTSTNWKGTN TKDKWTDRSS ERYKIDWEKE EMTN[GLSAWS 300
HPQFEK] 306
ADSDINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKNHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYVQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN[GLSAWSH 300
PQFEK] 305
KDSDINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKKHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYVQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWRKEE MTN 293
KDSDINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKKHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYVQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN 293
ADSKINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKKHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYVQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWRKEE MTN 293
ADSDINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKKHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK NYMSTLTYGF NGNVTGGGGGGIGGLIGANV SIGHTLNYKQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN 293
ADSDINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKKHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYKQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN 293
ADSKINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKKHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYKQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN 293
RDSDINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKNHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYVQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN 293
KDSNINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKNHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYVQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN 293
KDSDINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKNHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDKTG KIGGLIGANV SIGHTLKYVQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN 293
ADSDINIRTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKNHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYKQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN 293
ADSDINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKNHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNSIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYVQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN 293
MHHHHHHHHS GGSDKHTQYV KEHSFNYDEY KKANFDKIEC LIFDTESCTN 50
YENDNTGARV YGWGLGVTRN HNMIYGQNLN QFWEVCQNIF NDWYHDNKHT 100
IKITKTKKGF PKRKYIKFPI AVHNLGWDVE FLKYSLVENG FNYDKGLLKT 150
VFSKGAPYQT VTDVEEPKTF HIVQNNNIVY GCNVYMDKFF EVENKDGSTT 200
EIGLCLDFFD SYKIITCAES QFHNYVHDVD PMFYKMGEEY DYDTWRSPTH 250
KQTTLELRYQ YNDIYMLREV IEQFYIDGLC GGELPLTGMR TASSIAFNVL 300
KKMTFGEEKT EEGYINYFEL DKKTKFEFLR KRIEMESYTG GYTHANHKAV 350
GKTINKIGCS LDINSSYPSQ MAYKVFPYGK PVRKTWGRKP KTEKNEVYLI 400
EVGFDFVEPK HEEYALDIFK IGAVNSKALS PITGAVSGQE YFCTNIKDGK 450
AIPVYKELKD TKLTTNYNVV LTSVEYEFWI KHFNFGVFKK DEYDCFEVDN 500
LEFTGLKIGS ILYYKAEKGK FKPYVDHFTK MKVENKKLGN KPLTNQAKLI 550
LNGAYGKFGT KQNKEEKDLI MDKNGLLTFT GSVTEYEGKE FYRPYASFVT 600
AYGRLQLWNA IIYAVGVENF LYCDTDSIYC NREVNSLIED MNAIGETIDK 650
TILGKWDVEH VFDKFKVLGQ KKYMYHDCKE DKTDLKCCGL PSDARKIIIG 700
QGFDEFYLGK NVEGKKQRKK VIGGCLLLDT LFTIKKIMF* 739
GLSAENLYFQGHHHHHH
KADSDINIKT GTTDIGSNTT VKTGDLVTYD KENGMHKKVF YSFIDDKNHN 50
KKLLVIRTKG TIAGQYRVYS EEGANKSGLA WPSAFKVQLQ LPDNEVAQIS 100
DYYPRNSIDT KEYMSTLTYG FNGNVTGDDT GKIGGLIGAN VSIGHTLKYK 150
QPDFKTILES PTDKKVGWKV IFNNMVNQNW GPYDRDSWNP VYGNQLFMKT 200
RNGSMKAADN FLDPNKASSL LSSGFSPDFA TVITMDRKAS KQQTNIDVIY 250
ERVRDDYQLH WTSTNWKGTN TKDKWTDRSS ERYKIDWEKE EMTN 294
KADSDINIKT GTTDIGSNTT VKTGDLVTYD KENGMHKKVF YSFIDDKNHN 50
KKLLVIRTKG TIAGQYRVYS EEGANKSGLA WPSAFKVQLQ LPDNEVAQIS 100
DYYPRNSIDT KEYMSTLTYG FNGNVTGDDT GKIGGLIGAN VSIGHTLKYV 150
QPDFKTILES PTDKKVGWKV IFNNMVNQNW GPYDRDSWNP VYGNQLFMKT 200
RNGSMKAADN FLDPNKASSL LSSGFSPDFA TVITMDRKAS KQQTNIDVIY 250
ERVRDDYQLH WTSTNWKGTN TKDKWTDRSS ERYKIDWEKE EMTN 294
ADKDINIKTG TTDIGSNTTV KTGDLVTYDK ENGMHKKVFY SFIDDKNHNK 50
KLLVIRTKGT IAGQYRVYSE EGANKSGLAW PSAFKVQLQL PDNEVAQISD 100
YYPRNKIDTK EYMSTLTYGF NGNVTGDDTG KIGGLIGANV SIGHTLKYVQ 150
PDFKTILESP TDKKVGWKVI FNNMVNQNWG PYDRDSWNPV YGNQLFMKTR 200
NGSMKAADNF LDPNKASSLL SSGFSPDFAT VITMDRKASK QQTNIDVIYE 250
RVRDDYQLHW TSTNWKGTNT KDKWTDRSSE RYKIDWEKEE MTN 293
特許文献
[1] PCT/US2013/026514 (published as WO2013/123450) entitled “Methods for Creating Bilayers for Use with Nanopore Sensors”
[2] PCT/US2013/068967 (published as WO 2014/074727) entitled “Nucleic Acid Sequencing Using Tags”
[3] PCT/US14/61853 filed 23 October 2014 entitled “Methods for Forming Lipid Bilayers on Biochips”
[4] Aksimentiev and Schulten, Imaging a-Hemolysin with Molecular Dynamics: Ionic Conductance, Osmotic Permeability, and the Electrostatic Potential Map, Biophysical Journal (2005) 88: 3745-3761.
[5] Butler et al., Single-molecule DNA detection with an engineered MspA protein nanopore , PNAS (2008) 105(52): 20647-20652.
[6] Korchev et al., Low Conductance States of a Single Ion Channel are not 'Closed', J. Membrane Biol. (1995) 147:233-239.
[7] Krasilnikov and Sabirov, Ion Transport Through Channels Formed in Lipid Bilayers by Staphylococcus aureus Alpha-Toxin, Gen. Physiol. Biophys. (1989) 8:213-222.
[8] Nakane et al., A Nanosensor for Transmembrane Capture and Identification of Single Nucleic Acid Molecules, Biophys. J. (2004) 87:615-621.
[9] Rhee and Burns, Nanopore sequencing technology: nanopore preparations, TRENDS in Biotech. (2007) 25(4):174-181.
[10] Song et al., Structure of Staphylococcal α-Hemolysin, a Heptameric Transmembrane Pore, Science (1996) 274:1859-1866.
[11] Kasianowicz et al., Nanometer-scale pores: potential applications for analyte detection and DNA characterization, Proc. Natl. Acad. Sci. USA (1996) 93:13770-13773.
[12] Akeson et al., Microsecond timescale discrimination among polycytidylic acid, polyadenylic acid, and polyuridylic acid as homopolymers or as segments within single RNA molecules, Biophys. J. (1999) 77:3227-3233.
[13] Meller et al., Voltage-driven DNA translocations through a nanopore, Phys. Rev. Lett., 86 (2001), pp. 3435-3438.
[14] Howorka et al., Sequence-specific detection of individual DNA strands using engineered nanopores, Nat. Biotechnol., 19 (2001a), pp. 636-639.
[15] Howorka et al., Kinetics of duplex formation for individual DNA strands within a single protein nanopore, Proc. Natl. Acad. Sci. USA, 98 (2001b), pp. 12996-13001.
[16] Movileanu et al., Detecting protein analytes that modulate transmembrane movement of a polymer chain within a single protein pore, Nat. Biotechnol., 18 (2000), pp. 1091-1095.
Claims (9)
- 配列番号14にA1K、N47KおよびE287Rの置換を有するα-溶血素バリアント。
- DNAポリメラーゼに共有結合によって結合している、請求項1に記載のα-溶血素バリアントを含む組成物であって、好ましくは、前記バリアントが、DNAポリメラーゼにイソペプチド結合によって結合している、組成物。
- 請求項1に記載のα-溶血素バリアントを含む七量体ナノポア構築体であって、好ましくは、天然α-溶血素からなるポア複合体に対して、低減された通り抜ける時間(TTT)を有する、七量体ナノポア構築体。
- 共有結合によって結合しているDNAポリメラーゼをさらに含む、請求項3に記載の七量体ナノポア構築体。
- 請求項1に記載のα-溶血素バリアントをコードする核酸。
- 請求項5に記載のα-溶血素バリアントをコードする核酸を含むベクター。
- 請求項6に記載のベクターを用いて形質転換された宿主細胞。
- α-溶血素バリアントを作製する方法であって、
(a)請求項7に記載の宿主細胞を、α-溶血素バリアントを産生するのに好適な条件下、好適な培養培地中で培養するステップ、および
(b)前記産生されたα-溶血素バリアントを得るステップ、
を含む、前記方法。 - 標的分子を検出するための方法であって、
(a)検出電極に隣接して、またはその近傍に配置された膜中に、請求項3または4に記載の七量体ナノポア構築体を含むチップを設置するステップ、
(b)核酸分子を前記ナノポア中に通過させるステップであって、前記核酸分子が、リポーター分子と会合され、前記核酸分子が、アドレス領域およびプローブ領域を含み、前記リポーター分子が、前記プローブ領域で前記核酸分子と会合され、前記リポーター分子が、標的分子と連結される前記ステップ、
(c)前記核酸分子が前記ナノポア中を通過させられる間に前記アドレス領域をシーケンシングして、前記アドレス領域の核酸配列を調べるステップ、ならびに
(d)(c)において調べられた前記アドレス領域の核酸配列に基づいて、コンピュータプロセッサーを利用して前記標的分子を同定するステップ、
を含む、前記方法。
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