JP5841136B2 - 増大した3’末端ミスマッチ識別能を有するdnaポリメラーゼ - Google Patents
増大した3’末端ミスマッチ識別能を有するdnaポリメラーゼ Download PDFInfo
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- JP5841136B2 JP5841136B2 JP2013514597A JP2013514597A JP5841136B2 JP 5841136 B2 JP5841136 B2 JP 5841136B2 JP 2013514597 A JP2013514597 A JP 2013514597A JP 2013514597 A JP2013514597 A JP 2013514597A JP 5841136 B2 JP5841136 B2 JP 5841136B2
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- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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- 238000012417 linear regression Methods 0.000 description 1
- 239000002502 liposome Substances 0.000 description 1
- 238000000504 luminescence detection Methods 0.000 description 1
- 239000012139 lysis buffer Substances 0.000 description 1
- 229960000274 lysozyme Drugs 0.000 description 1
- 239000004325 lysozyme Substances 0.000 description 1
- 235000010335 lysozyme Nutrition 0.000 description 1
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- 229910052748 manganese Inorganic materials 0.000 description 1
- 229940071125 manganese acetate Drugs 0.000 description 1
- UOGMEBQRZBEZQT-UHFFFAOYSA-L manganese(2+);diacetate Chemical compound [Mn+2].CC([O-])=O.CC([O-])=O UOGMEBQRZBEZQT-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 229930182817 methionine Natural products 0.000 description 1
- 230000011987 methylation Effects 0.000 description 1
- 238000007069 methylation reaction Methods 0.000 description 1
- YACKEPLHDIMKIO-UHFFFAOYSA-N methylphosphonic acid Chemical class CP(O)(O)=O YACKEPLHDIMKIO-UHFFFAOYSA-N 0.000 description 1
- 230000003278 mimic effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000010369 molecular cloning Methods 0.000 description 1
- 210000004897 n-terminal region Anatomy 0.000 description 1
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- JJVOROULKOMTKG-UHFFFAOYSA-N oxidized Photinus luciferin Chemical compound S1C2=CC(O)=CC=C2N=C1C1=NC(=O)CS1 JJVOROULKOMTKG-UHFFFAOYSA-N 0.000 description 1
- PSWJVKKJYCAPTI-UHFFFAOYSA-N oxido-oxo-phosphonophosphanylphosphanium Chemical compound OP(O)(=O)PP(=O)=O PSWJVKKJYCAPTI-UHFFFAOYSA-N 0.000 description 1
- LDCYZAJDBXYCGN-UHFFFAOYSA-N oxitriptan Natural products C1=C(O)C=C2C(CC(N)C(O)=O)=CNC2=C1 LDCYZAJDBXYCGN-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
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- COLNVLDHVKWLRT-UHFFFAOYSA-N phenylalanine Natural products OC(=O)C(N)CC1=CC=CC=C1 COLNVLDHVKWLRT-UHFFFAOYSA-N 0.000 description 1
- 239000013600 plasmid vector Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
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- 229920001223 polyethylene glycol Polymers 0.000 description 1
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- XFKVYXCRNATCOO-UHFFFAOYSA-M rhodamine 6G Chemical compound [Cl-].C=12C=C(C)C(NCC)=CC2=[O+]C=2C=C(NCC)C(C)=CC=2C=1C1=CC=CC=C1C(=O)OCC XFKVYXCRNATCOO-UHFFFAOYSA-M 0.000 description 1
- 239000001022 rhodamine dye Substances 0.000 description 1
- 108010066533 ribonuclease S Proteins 0.000 description 1
- 239000002342 ribonucleoside Substances 0.000 description 1
- 125000000548 ribosyl group Chemical group C1([C@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 1
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- 238000005096 rolling process Methods 0.000 description 1
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- 238000010561 standard procedure Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 239000012536 storage buffer Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000008163 sugars Chemical class 0.000 description 1
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229960002180 tetracycline Drugs 0.000 description 1
- 229930101283 tetracycline Natural products 0.000 description 1
- 235000019364 tetracycline Nutrition 0.000 description 1
- 150000003522 tetracyclines Chemical class 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- RYYWUUFWQRZTIU-UHFFFAOYSA-K thiophosphate Chemical compound [O-]P([O-])([O-])=S RYYWUUFWQRZTIU-UHFFFAOYSA-K 0.000 description 1
- 230000005026 transcription initiation Effects 0.000 description 1
- 108091008023 transcriptional regulators Proteins 0.000 description 1
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- 150000005691 triesters Chemical class 0.000 description 1
- 125000002264 triphosphate group Chemical class [H]OP(=O)(O[H])OP(=O)(O[H])OP(=O)(O[H])O* 0.000 description 1
- UNXRWKVEANCORM-UHFFFAOYSA-N triphosphoric acid Chemical compound OP(O)(=O)OP(O)(=O)OP(O)(O)=O UNXRWKVEANCORM-UHFFFAOYSA-N 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
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- 239000002569 water oil cream Substances 0.000 description 1
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- C12N9/1241—Nucleotidyltransferases (2.7.7)
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Description
P−N−L−Q−N−X1−P−X2−X3−X4−X5−X6−G:
[ここで、
X1は、I又はLであり;
X2は、I、V又はTであり;
X3は、R又はK以外の任意のアミノ酸であり;
X4は、T、S又はLであり;
X5は、P又はEであり;
X6は、L又はEである]
をポリメラーゼドメイン中に含むモチーフを含んでなる(配列番号8)。
P−N−L−Q−N−X1−P−X2−X3−X4−X5−X6−G:
[ここで、
X1は、I又はLであり;
X2は、I、V又はTであり;
X3は、R又はK以外の任意のアミノ酸であり;
X4は、T又はSであり;
X5は、P又はEであり;
X6は、L又はEである]
をポリメラーゼドメイン中に含むモチーフを含んでなる(配列番号9)。
P−N−L−Q−N−I−P−X2−X3−T−P−L−G:
[ここで、
X2は、I又はVであり;そして
X3は、R以外の任意のアミノ酸である]
をポリメラーゼドメイン中に含むモチーフを含んでなる(配列番号10)。
(a)サーマス種Z05DNAポリメラーゼ(Z05)(配列番号1);
(b)サーマス・アクアティカスDNAポリメラーゼ(Taq)(配列番号2);
(c)サーマス・フィリホルミスDNAポリメラーゼ(Tfi)(配列番号3);
(d)サーマス・フラバスDNAポリメラーゼ(Tfl)(配列番号4);
(e)サーマス種Sps17DNAポリメラーゼ(Sps17)(配列番号5);
(f)サーマス・サーモフィルスDNAポリメラーゼ(Tth)(配列番号6);及び
(g)サーマス・カルドフィラスDNAポリメラーゼ(Tca)(配列番号7)からなる群から選択されるポリメラーゼと、少なくとも80%、好ましくは少なくとも90%、より好ましくは少なくとも95%の配列同一性を有する。
(a)サーモトガ・マリティマDNAポリメラーゼ(Tma)(配列番号38);
(b)サーモトガ・ネアポリタナDNAポリメラーゼ(Tne)(配列番号39);からなる群から選択されるポリメラーゼと少なくとも80%、好ましくは少なくとも90%、より好ましくは少なくとも95%の配列同一性を有する。
他に断りがない限り、本明細書で用いる技術用語及び科学用語は全て、本発明が属する分野の当業者により一般的に理解されるものと同じ意味を有する。本質的に本明細書に記載のものと同様の任意の方法及び材料を本発明の実施又は試験に用いることができるが、例示的な方法と材料のみを記載する。本発明の目的上、以下の用語は下記のとおり定義される。
態様によっては、本発明のDNAポリメラーゼは、以下のモチーフを有することにより特徴づけることができる:
Pro−Asn−Leu−Gln−Asn−X1−Pro−X2−X3−X4−X5−X6−Gly(本明細書において、1文字コードで、P−N−L−Q−N−X1−P−X2−X3−X4−X5−X6−Gとも呼ぶ);
ここで、X1は、Ile(I)、又はLeu(L)であり;
X2は、Ile(I)、Val(V)、又はThr(T)であり;
X3は、Arg(R)又はLys(K)以外の任意のアミノ酸であり;
X4は、Thr(T)、Ser(S)又はLeu(L)であり;
X5は、Pro(P)又はGlu(E)であり;そして
X6は、Leu(L)又はGlu(E)である(配列番号8)。
Pro−Asn−Leu−Gln−Asn−X1−Pro−X2−X3−X4−X5−X6−Gly(本明細書において、1文字コードで、P−N−L−Q−N−X1−P−X2−X3−X4−X5−X6−Gとも呼ぶ);
ここで、X1は、Ile(I)、又はLeu(L)であり;
X2は、Ile(I)、Val(V)、又はThr(T)であり;
X3は、Arg(R)又はLys(K)以外の任意のアミノ酸であり;
X4は、Thr(T)又はSerであり;そして
X5は、Pro(P)又はGlu(E)であり;
X6は、Leu(L)又はGlu(E)である(配列番号9)。
Pro−Asn−Leu−Gln−Asn−Ile−Pro−X2−X3−Thr−Pro−Leu−Gly(本明細書において、1文字コードで、P−N−L−Q−N−I−P−X2−X3−T−P−L−Gとも呼ぶ);
ここで、X2は、Ile(I)又はVal(V)であり;
X3は、Arg(R)以外の任意のアミノ酸である(配列番号10)。
Pro−Asn−Leu−Gln−Asn−Ile−Xa3−Thr−Pro−Leu−Gly(本明細書において、1文字コードで、P−N−L−Q−N−I−P−I−X3−T−P−L−Gとも呼ぶ);
ここで、X3は、His(H)、Leu(L)、又はSer(S)である(配列番号11)。
T−G−R−L−S−S−X7−X8−P−N−L−Q−N;
ここで、X7は、Ser(S)又はThr(T)であり;
X8 は、D又はE以外の任意のアミノ酸である(配列番号27)。
本発明の改良DNAポリメラーゼは、この種の酵素活性が必要又は所望である任意の目的に使用してよい。改良DNAポリメラーゼは、本明細書に記載されるように熱活性又は熱安定性DNAポリメラーゼでありうる。したがって、本発明の一つの面においては、本発明のポリメラーゼを用いたPCRを含むポリヌクレオチド伸長方法が提供される。態様によっては、本発明は、鋳型核酸の増幅が不要な場合、例えば、標的核酸の存在を直ちに検出することが望まれる場合に、鋳型RNA又はDNAを伸長するのに有用な熱活性DNAポリメラーゼを提供する。態様によっては、本発明は、標的核酸を伸長及び/又は増幅するのが望まれる場合に有用な熱安定性DNAポリメラーゼを提供する。ポリヌクレオチド伸長に適切な条件は、当業界で公知である(例えば、上述のSambrook et al.参照。Ausubel et al., Short Protocols in Molecular Biology (4th ed.,John Wiley & Sons 1999)も参照)。一般に、プライマーを標的核酸にアニーリングし、すなわちハイブリダイズさせて、プライマー−鋳型複合体を形成させる。プライマー−鋳型複合体を適切な環境下で変異DNAポリメラーゼ及びヌクレオシド三リン酸と接触させ、プライマーの3’末端に1つ以上のヌクレオチドを付加し、それにより標的核酸に相補的な伸長プライマーを生成する。プライマーとしては、例えば、1つ以上のヌクレオチド類似体を挙げることができる。さらに、ヌクレオシド三リン酸は、従来のヌクレオチド、特殊なヌクレオチド(例えば、リボヌクレオチド又は標識されたヌクレオチド)又はその混合物でありうる。変形によっては、ポリヌクレオチド伸長反応は、標的核酸の増幅を含んでなる。DNAポリメラーゼ及びプライマー対を用いた核酸増幅に適切な条件もまた、当業界で公知である(例えば、PCR増幅法)。(例えば、上述のSambrook et al.,;上述のAusubel et al.,; PCR Applications: Protocols for Functional Genomics (Innis et al. eds., Academic Press 1999参照))。
本発明の別の面では、本明細書に記載するプライマー伸長方法に用いられるキットが提供される。態様によっては、キットは、使用の簡易性のために区分され、本発明にしたがって増大した3’末端ミスマッチ識別能を有する本発明のDNAポリメラーゼを提供する少なくとも1つの容器を含む。追加の試薬を提供する1つ以上の追加の容器を含むこともできる。そのような追加の容器は上述の方法にしたがったプライマー伸長法で用いる、当業者に認識された任意の試薬又は他の要素を含むことができ、それには、例えば、核酸増幅法(例えば、PCR、RT−PCR)、DNAシークエンシング法又はDNAラベリング法で用いる試薬が含まれる。例えば、特定の態様においては、キットはさらに、プライマー伸長条件下で所定の鋳型ポリヌクレオチドにハイブリダイズ可能な5’センスプライマー、又は5’センスプライマーと対応する3’アンチセンスプライマーを含んでなるプライマー対を提供する容器を含む。態様によっては、キットは一塩基多型又は多塩基多型と完全に相補的な1つ以上のプライマーを含む1つ以上の容器を含み、ここでプライマーは、上述のように多重反応に有用である。他の相互排他的でない変形においては、キットはヌクレオシド三リン酸(従来の及び/又は特殊な)を提供する1つ以上の容器を含む。特定の態様では、キットはアルファ−ホスホロチオエートdNTP、dUTP、dITP及び/又は、例えばフルオレセイン又はシアニン色素ファミリーdNTPのような標識されたdNTPを含む。さらに他の相互排他的でない態様においては、キットは、プライマー伸長反応に適切な緩衝液を提供する1つ以上の容器を含む。態様によっては、キットは1つ以上の標識された、又は標識されていないプローブを含む。プローブの例としては、二重標識されたFRET(蛍光共鳴エネルギー転移)プローブ及び分子標識プローブが挙げられる。別の態様においては、キットは、例えば、ホットスタートPCR分析用のアプタマーを含む。
本発明の別の面においては、反応混合物は、本明細書に記載されるように、増大した3’末端ミスマッチ識別活性を有するポリメラーゼを含んで提供される。反応混合物は、例えば、核酸増幅法(例えば、PCR、RT−PCR)、DNAシークエンシング法又はDNAラベリング法で用いる試薬をさらに含むことができる。例えば、特定の態様においては、反応混合物はプライマー伸長反応に適切な緩衝液を含んでなる。反応混合物はまた、鋳型核酸(DNA及び/又はRNA)、1つ以上のプライマー又はプローブポリヌクレオチド、ヌクレオシド三リン酸(例えば、デオキシリボヌクレオチド、リボヌクレオチド、標識されたヌクレオチド、特殊なヌクレオチドを含む)、塩類(例えば、Mn2+、Mg2+)、及び標識(例えば、蛍光色素分子)を含むこともできる。態様によっては、反応混合物はさらに、SYBRgreenのような二本鎖DNA結合色素、又は臭化エチジウムのような二本鎖DNAインターカレーション色素を含んでなる。態様によっては、反応混合物はプライマー伸長条件下で所定の鋳型ポリヌクレオチドにハイブリダイズ可能な5’センスプライマー、又は5’センスプライマーと対応する3’アンチセンスプライマーを含んでなるプライマー対を含む。特定の態様においては、反応混合物はさらに、増幅した鋳型核酸の検出のための蛍光FRET加水分解プローブ、例えばTaqman(登録商標)プローブを含んでなる。態様によっては、反応混合物は、一塩基多型又は多塩基多型と完全に相補的な2つ以上のプライマーを含む。態様によっては、反応混合物は、アルファ−ホスホロチオエートdNTP、dUTP、dITP及び/又は、例えばフルオレセイン又はシアニン色素ファミリーdNTPのような標識されたdNTPを含む。
この実施例の対照DNAポリメラーゼは、580番目のアミノ酸がグリシンであることを除き、配列番号1のサーマス種Z05DNAポリメラーゼである(例えば、D580G置換)(以下Z05 D580Gポリメラーゼ)。
フォワードプライマー:5’−CTACCTCCTGGACCCCTCCAA−3’(配列番号31);及び
リバースプライマー:5’−ATAACCAACTGGTAGTGGCGTGTAA−3’(配列番号32)。
この実施例の対照DNAポリメラーゼは、580番目のアミノ酸がグリシンであることを除き(例えば、D580G置換)、配列番号1のサーマス種Z05DNAポリメラーゼである(以下Z05 D580Gポリメラーゼ)。
Claims (8)
- 配列番号1の配列と少なくとも90%の配列同一性を有し、かつ対照DNAポリメラーゼと比較して、増大した3’末端ミスマッチ識別活性を有するDNAポリメラーゼであって、該DNAポリメラーゼが、以下の:
P−N−L−Q−N−I−P−X 2 −X 3 −T−P−L−G
[ここで、
X 2 は、Iであり;
X 3 は、H、L又はSである(配列番号11)]
を含むポリメラーゼドメインにおけるモチーフを含み、ここで、配列番号1の580番目に対応するDNAポリメラーゼのアミノ酸がGであり、そして当該対照DNAポリメラーゼは、対照DNAポリメラーゼのアミノ酸がX 3 がRであることを除き、当該DNAポリメラーゼと同一のアミノ酸配列を有する、DNAポリメラーゼ。 - 前記ポリメラーゼが、配列番号1に対し少なくとも95%の配列同一性を有する、請求項1に記載のDNAポリメラーゼ。
- 前記DNAポリメラーゼがZ05DNAポリメラーゼである、請求項1又は2に記載のDNAポリメラーゼ。
- 請求項1〜3のいずれか1項に記載のDNAポリメラーゼをコードする組換え核酸。
- プライマー伸長を行うための方法であって:
請求項1〜3のいずれか1項に記載のDNAポリメラーゼとプライマー、鋳型ポリヌクレオチド及びヌクレオシド三リン酸とを、当該プライマーの伸長に適切な条件下で接触させ、伸長プライマーを生成することを含んでなる、方法。 - 伸長プライマーを生成するキットであって:
請求項1〜3のいずれか1項に記載のDNAポリメラーゼを提供する少なくとも1つの容器を含んでなる、キット。 - (a)プライマー伸長条件下で、所定の鋳型ポリヌクレオチドにハイブリダイズ可能なプライマーを提供する容器;
(b)ヌクレオシド三リン酸を提供する容器;
(c)プライマー伸長に適切な緩衝液を提供する容器
からなる群から選択される1つ以上の追加の容器をさらに含んでなる、請求項6に記載のキット。 - 請求項1〜3のいずれか1項に記載のDNAポリメラーゼ、少なくとも一つのプライマー、鋳型ポリヌクレオチド及びヌクレオシド三リン酸を含んでなる反応混合物。
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