JP5617075B2 - 酵素 - Google Patents
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- JP5617075B2 JP5617075B2 JP2010548164A JP2010548164A JP5617075B2 JP 5617075 B2 JP5617075 B2 JP 5617075B2 JP 2010548164 A JP2010548164 A JP 2010548164A JP 2010548164 A JP2010548164 A JP 2010548164A JP 5617075 B2 JP5617075 B2 JP 5617075B2
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/12—Transferases (2.) transferring phosphorus containing groups, e.g. kinases (2.7)
- C12N9/1241—Nucleotidyltransferases (2.7.7)
- C12N9/1252—DNA-directed DNA polymerase (2.7.7.7), i.e. DNA replicase
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Description
本明細書に記載される単離核酸を含んでなるベクターがさらに提供される。
本発明の核酸又はベクターで形質転換された宿主細胞が、さらに提供される。
宿主細胞由来の組換えポリペプチド発現も、本発明に包含される。
(1)前記標的核酸を、本明細書に記載の熱安定性DNAポリメラーゼ活性を有するポリペプチドと接触させるステップ:及び
(2)前記標的核酸を、当該標的核酸を増幅させる熱サイクル反応条件下、前記ポリペプチドと一緒にインキュベートするステップ、
を含んでなる方法を提供する。
(1)前記標的核酸を、本明細書に記載の熱安定性DNAポリメラーゼ活性を有するポリペプチドと接触させるステップ;及び
(2)前記標的核酸を、当該標的核酸を増幅させる熱サイクル反応条件下、前記ポリペプチドと一緒にインキュベートするステップ、
を含んでなる方法を包含する。
T.インディクス培養物からのゲノムDNA抽出のための方法は、Gotz等(2002,Int.J.Syst.Evol.Microbiol.52:1349−1359)に基づくが、これは、Ausubel等(1994;Gurrent Protocols in Molecular Biology,Wiley,New York)に記載される方法の修正法である。
スクリーニング方法は、Shandilya等(2004,Extremophiles 8:243−251)に基づいた。
5’−CATTTTTGCTGCCGATTAywsncarathga−3’(配列番号5);及び
PolATRプライマーは以下の配列を有する:
5’−AACCGCGAAGTTTTTATTyragyagyac−3’(配列番号6)。
実施例2で得られた増幅産物から、T.インディクスgDNAが「歩行し(walk along)」、DNA polA遺伝子の5'開始及び3'停止に到達するよう、プライマーを設計した。
第一ラウンドPCR反応ミックスは、以下の通りとした。
5’−AATCAAGGTTTCATCTCCCG−3'(配列番号9);及び
プライマー3[15286_3_(pos.2453)]は、以下の配列を有する:
5’−TATTCAGGGGACAGCCGCTG−3’(配列番号10)。
第二ラウンドPCR反応ミックスは、以下の通りとした。
5’−TAATGGGCTAAAACTCGCAG−3’(配列番号11);及び
プライマー4[15286_4_(pos.2521)]は、以下の配列を有する:
5'−AAGGCTTTGGGACAAGGATG−3’(配列番号12)。
プライマー2及び3(上記の通り)を用いる第一ラウンドPCRの後、プライマー1及び4(上記の通り)を用いるネスト化PCRを行った。
プライマー6及び7(以下を参照されたい)を用いる第一ラウンドPCRの後、プライマー5及び8(以下を参照されたい)を用いるネスト化PCRを行った。
5’−TCT CGC TTT GTT TTA ACC C−3’(配列番号13);
プライマー6[15286_6_(pos.1013)]は、以下の配列を有する:
5’−CAT GCG TGG GAA AAT AGT A−3’(配列番号14);
プライマー7[15286_7_(pos.1008)]は、以下の配列を有する:
5’−ACT TTA TCC GGG TCA AGA AC−3’(配列番号15);及び
プライマー8[15286_8_(pos.941)]は、以下の配列を有する:
5’−TTT CGT ATC ACT TTC AAG GTC−3’(配列番号16)。
実施例3に記載の遺伝子ウォーキングプロトコールから得た配列データに基づき、ラージ(クレノウ)フラグメントについての開始及び停止が予測でき(既知のDNA polA配列を有するアラインメント、例えばTaq KlenTaqフラグメントに基づき)、全体のラージフラグメント遺伝子(〜1.7kb)を増幅する特異的プライマーの設計が可能となった。
15286_FL_上流(NdeI)
5’−GTC CAC CAT ATG GCG CAG AAA AGC TTG TTT CCT AAA AAA TTA CCA TTT AAA GAT GA−3’(配列番号17);
15286_LF_上流(NdeI)
5’−CTT GAA CAT ATG GGC CTC TTA AAA GAA CTT CCA GCT AC−3’(配列番号18);及び
15286_下流(SalI)
5’−AGC CCT GTC GAC GGA TCC GCC AGC TTA TGC CTT TGC CTC TGC−3’(配列番号19)である
pET24a(+)ベクター(Novagen)を改変し、NdeI部位の上流に6×HISタグを付加した(図2を参照されたい)。当該HISタグは、以下の通り、XbaIとBamHI部位との間に挿入された。
5’−TTC CCC TCT AGA AAT AAT TTT GTT TAA CTT TAA GAA GGA GAT ATA CTA TG CAC CA−3’(配列番号20)、及び
その下流プライマー(BamHI)が以下の配列を有する:
5’−GAA TTC GGA TCC GCT AGC CAT ATG GTG ATG GTG ATG GTG CAT AGT ATA TCT CCT T−3’(配列番号21)。
T7_プロモーター:5’−AAATTAATACGACTCACTATAGGG−3’(配列番号22)、
T7_ターミネーター:5’−GCTAGTTATTGCTCAGCGG−3’(配列番号23)。
実施例4からのPCR産物を、Promega Wizard 精製キットを用いて精製し、その後NdeI/SalIを用いてRE消化を行った。DNAを、フェノール/クロロホルム抽出し、エタノール沈殿し、そして水に再懸濁した。その後、全長(「FL」)及びラージフラグメント(「LF」)配列を、各々pET24a(+)及びpET24a(+)HISに、NdeIとSalIとの間にライゲーションし、KRX細胞(Promega)にエレクトロポレート処理した。ベクター特異的T7プライマーを用いて、コロニーをPCRによりスクリーニングした。
実施例6から得た組換えコロニーを、5mlのLuria Broth(カナマイシン/クロラムフェニコールを含有する)中で一晩増殖させた。50mlのTerrific Brothバッフル付振とうフラスコに、一晩培養物の1/100希釈物を接種した。培養物を、275rpm、37℃で、OD600〜1まで増殖させ、その後24℃まで低下させ、終濃度0.1%のL−ラムノース、及び終濃度10mMのIPTGで誘導した。培養物を275rpm、24℃でさらに18時間インキュベートした。その後、10mlの培養物を、5000×gで10分間遠心分離により回収し、そして細胞を1mlの溶解緩衝剤(50mM Tris−HCl,pH8.0,100mM NaCl,1mM EDTA)中に再懸濁し、氷上で30秒、2バーストで超音波粉砕した(40v)。サンプルを5000×gで5分間遠心分離し、70℃で20分間熱溶解させ、バックグラウンドE.coliタンパク質を変性させた。サンプルを遠心分離し、上清の一定量を8%SS−PAGEでサイズ分画した。
実施例7で得られたサンプルのPCR活性を、500bpのλDNA PCRアッセイで試験した。Taq DNAポリメラーゼ(1.25u)をポジティブコントロールとして使用した。
5’−GATGAGTTCGTGTCCGTACAACTGG−3’(配列番号24)、
一方、下流プライマーは以下の配列を有する:
5’−GGTTATCGAAATCAGCCACAGCGCC−3'(配列番号25)。
実施例7で得られたサンプルを、ループ媒介等温増幅(LAMP)活性についても試験した。
ラムダ−FIP−LAMP(「FIP」)
5’−CAGCCAGCCGCAGCACGTTCGCTCATAGGAGATATGGTAGAGCCGC−3’(配列番号26);
ラムダ−BIP−LAMP(「BIP」)
5’−GAGAGAATTTGTACCACCTCCCACCGGGCACATAGCAGTCCTAGGGACAGT−3'(配列番号27);
ラムダ−F3−LAMP(「F3」)
5’−GGCTTGGCTCTGCTAACACGTT−3'(配列番号28);
ラムダ−B3−LAMP(「B3」)
5’−GGACGTTTGTAATGTCCGCTCC−3'(配列番号29);
ラムダ−loopF−LAMP(「loopF」)
5’−CTGCATACGACGTGTCT−3’(配列番号30);及び
ラムダ−loopB−LAMP(「loopB」)
5’−ACCATCTATGACTGTACGCC−3’(配列番号31)。
T.インディクスラージフラグメントの熱安定性を、実施例7に記載の通り、500bp λDNA PCRアッセイを用いて試験した。誘導したラージフラグメントのサンプルを、95℃で、0、2、4、6、8、10、15又は20分インキュベートし、その後、500bp λDNA PCRアッセイで使用した。使用した条件下で、ラージフラグメントは、95℃で最大4分のインキュベーションまで無影響であることがわかり、6分のインキュベーション後、PCR活性の低減を示し、そして8分のインキュベーション後は、検出可能なPCR産物は作製されなかった(データは示さない)。
Claims (12)
- 熱安定性DNAポリメラーゼ活性を有し、且つ鎖置換活性を呈し、且つ配列番号1に示されるサーモデスルファテーター・インディクス(Thermodesulfatator indicus)DNAポリメラーゼIラージフラグメント(Large fragment)と、少なくとも90%同一であるアミノ酸配列を含んでなるか、又は当該アミノ酸配列からなる、ポリペプチド。
- ループ媒介等温増幅(loop−mediated isothermal amplification)(LAMP)等の、等温増幅反応の実施に適する、及び/又は、ポリメラーゼ連鎖反応(PCR)等の、熱サイクル増幅反応の実施に適する、請求項1に記載のポリペプチド。
- 前記アミノ酸配列が、配列番号32である、請求項1又は2に記載のポリペプチド。
- Cren7エンハンサードメインをさらに含んでなる、請求項1〜3のいずれか1項に記載のポリペプチド。
- 請求項1〜4のいずれか1項に記載のポリペプチドを含んでなる組成物。
- 請求項1又は2に記載のポリペプチドをコードする核酸。
- 配列番号3又は配列番号33のヌクレオチド配列を有する、請求項6に記載の核酸。
- 請求項7に記載の核酸を含んでなるベクター。
- 請求項6又は7に記載の核酸、又は請求項8に記載のベクターで形質転換された宿主細胞。
- 請求項1〜4のいずれか1項に記載のポリペプチド、及び/又は請求項5に記載の組成物、及び/又は請求項6又は7に記載の単離核酸、及び/又は請求項8に記載のベクター、及び/又は請求項9に記載の宿主細胞を、その包装材料と一緒に含んでなる、キット。
- 熱サイクル反応を用いる標的核酸の配列を増幅する方法であって、
(1)前記標的核酸を、請求項1〜4のいずれか1項に記載のポリペプチドと接触させるステップ:及び
(2)前記標的核酸を、当該標的核酸を増幅させる熱サイクル反応条件下、前記ポリペプチドと一緒にインキュベートするステップ、
を含んでなる、方法。 - 等温反応を用いる標的核酸の配列を増幅する方法であって、
(1)前記標的核酸を、請求項1〜4のいずれか1項に記載のポリペプチドと接触させるステップ;及び
(2)前記標的核酸を、当該標的核酸を増幅させる等温反応条件下、前記ポリペプチドと一緒にインキュベートするステップ、
を含んでなる、方法。
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US20110020877A1 (en) * | 2008-01-11 | 2011-01-27 | Genesys Limited | Cren7 chimeric protein |
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CN113637085B (zh) * | 2020-05-11 | 2024-01-30 | 苏州先达基因科技有限公司 | 融合dna聚合酶突变体及其在等温扩增中的应用 |
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