JP6441534B2 - 発光酵素タンパク質 - Google Patents
発光酵素タンパク質 Download PDFInfo
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- JP6441534B2 JP6441534B2 JP2018504587A JP2018504587A JP6441534B2 JP 6441534 B2 JP6441534 B2 JP 6441534B2 JP 2018504587 A JP2018504587 A JP 2018504587A JP 2018504587 A JP2018504587 A JP 2018504587A JP 6441534 B2 JP6441534 B2 JP 6441534B2
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Description
(i)配列番号2のアミノ酸配列を含む発光酵素タンパク質、
(ii)配列番号2のアミノ酸配列において1又は複数のアミノ酸残基が置換、付加又は欠失したアミノ酸配列を含み、かつルシフェラーゼ活性を有する発光酵素タンパク質、
(iii)配列番号2のアミノ酸配列と70%以上の同一性を有するアミノ酸を含む発光酵素タンパク質、
(iv)配列番号10の塩基配列によりコードされるアミノ酸配列を含む発光酵素タンパク質、
(v)配列番号10の塩基配列において1又は複数の塩基が置換、付加又は欠失した塩基配列によりコードされるアミノ酸配列を含み、かつルシフェラーゼ活性を有する発光酵素タンパク質、
(vi)配列番号10の塩基配列と70%以上の同一性を有する塩基配列によりコードされるアミノ酸配列を含む発光酵素タンパク質、及び
(vii)配列番号10の塩基配列と相補的な塩基配列からなる核酸とストリンジェントな条件下でハイブリダイズする塩基配列によりコードされるアミノ酸配列を含み、かつルシフェラーゼ活性を有する発光酵素タンパク質。
(ii)配列番号2のアミノ酸配列において1又は複数のアミノ酸残基が置換、付加又は欠失したアミノ酸配列を含み、かつルシフェラーゼ活性を有する発光酵素タンパク質、
(iii)配列番号2のアミノ酸配列と70%以上かつ100%未満の同一性を有するアミノ酸を含む発光酵素タンパク質、
(v)配列番号10の塩基配列において1又は複数の塩基が置換、付加又は欠失した塩基配列によりコードされるアミノ酸配列を含み、かつルシフェラーゼ活性を有する発光酵素タンパク質、
(vi)配列番号10の塩基配列と70%以上かつ100%未満の同一性を有する塩基配列によりコードされるアミノ酸配列を含む発光酵素タンパク質、及び
(vii)配列番号10の塩基配列と相補的な塩基配列からなる核酸とストリンジェントな条件下でハイブリダイズする塩基配列によりコードされるアミノ酸配列を含み、かつルシフェラーゼ活性を有する発光酵素タンパク質。
(i)配列番号2のアミノ酸配列を含む発光酵素タンパク質、
(ii)配列番号2のアミノ酸配列において1又は複数のアミノ酸残基が置換、付加又は欠失したアミノ酸配列を含み、かつ発光酵素活性を有する発光酵素タンパク質、
(iii)配列番号2のアミノ酸配列と70%以上の相同性若しくは同一性を有するアミノ酸を含む発光酵素タンパク質、
(iv)配列番号10の塩基配列によりコードされるアミノ酸配列を含む発光酵素タンパク質、
(v)配列番号10の塩基配列において1又は複数の塩基が置換、付加又は欠失した塩基配列によりコードされるアミノ酸配列を含み、かつ発光酵素活性を有する発光酵素タンパク質、
(vi)配列番号10の塩基配列と70%以上の相同性若しくは同一性を有する塩基配列によりコードされるアミノ酸配列を含む発光酵素タンパク質、及び
(vii)配列番号10の塩基配列と相補的な塩基配列からなる核酸とストリンジェントな条件下でハイブリダイズする塩基配列によりコードされるアミノ酸配列を含み、かつ発光酵素活性を有する発光酵素タンパク質。
発光ゴカイ、オドントシリス・ウンデシムドンタ(Odontosyllis undecimdonta)は富山湾で採取し、ドライアイスにて凍結したのち、超低温フリーザにて保存したものを使用した。
従来行われてきたカラム等による精製を経て順次高純度の発光酵素を得る手法を適用するためには初発の試料を大量に確保する必要があり、今日的には現実的ではない。そこで、本発明者らは、鋭意検討を重ね、発光ゴカイの分泌する発光液中のタンパク質成分としては、発光酵素が極めて純度高く、かつ、多量に含まれており、精製の過程を経ずとも量及び質ともに十分な発光酵素の取得が可能であることを見出し、以下のとおり、発光液そのものから直接発光酵素を同定した。
発光ゴカイ、オドントシリス・ウンデシムドンタの凍結試料からTrizol試薬(サーモフィッシャー・サイエンティフィック社製)を用いて、製品プロトコルに従って、トータルRNAを抽出し、MicroPoly(A) Purist Kit(サーモフィッシャー・サイエンティフィック社製)を用いて、製品プロトコルに従って、mRNAを回収した。さらに、NEB社製NEBNext mRNA Library Prep Master Mix Set for Illuminaを用いて、製品プロトコルに従って、RNA-seq解析に供する試料ライブラリを作製した。試料ライブラリはイルミナ社製MiSeqにMiSeq Reagent Kit v3 (600-cycles)を装備してシーケンス解析に供した。得られた配列は国立遺伝学研究所の提供するNGS解析プラットフォームによって解析を行い、実施例2で得られたペプチド断片配列及びその類縁配列を含む単一のタンパク質をコードする可能性のある配列番号1に示す核酸配列を見出した。この配列は、1252塩基からなり、配列番号2に示す329残基からなるポリペプチドをコードするORF(Open Reading Frame)を持ち、そのほか5'UTRと予想される57塩基及び3'UTRと予想される205塩基を有していた。
catatgaagt tagcactgtt actcagc (配列番号3)
tctagactgt tgtaggttat acatctcagc (配列番号4)。
発光ゴカイ、オドントシリス・ウンデシムドンタ凍結試料から、キアゲン社製DNeasy Plant mini Kitを用いて、製品プロトコルに従って、ゲノムDNAの精製を行った。得られたゲノムDNAを鋳型として、配列番号3及び4のプライマ及びExTaq(タカラ社製)を用いて98℃にて10秒、55℃にて30秒、72℃にて6分のサイクルを30回繰り返して行うPCRにより該生物がゲノムDNAに有する実施例3のcDNAをコードする領域を増幅した。得られたDNA断片をpCR4.0-Topoベクター(サーモフィッシャーサイエンティフィック社製)に挿入し該ゲノム領域を有するプラスミドを取得した。該プラスミドの塩基配列解析を行い、全長領域を解析した結果、ゲノム上では該cDNAは配列番号5に示す4804塩基のゲノムDNAに8つのオペロンとしてコードされていることが明らかとなった。
実施例3で取得したプラスミドを鋳型として配列番号6及び7に示すプライマ及びKOD plus neo(東洋紡社製)を用いて94℃にて2分処理したのち、98℃にて10秒、68℃にて30秒、のサイクルを30回繰り返して行うPCRにより約1千塩基長の5'末端にHindIII、3'末端にSmaIの認識配列を付加したDNA断片を得た。この断片をHindIII及びSmaI(いずれもタカラ社製)にて処理し、アガロースゲル電気泳動により約1千塩基長のバンドをゲルから切り出し、精製した。一方で、哺乳類細胞発現用ベクターとして、pFLAG-CMV-2(シグマ・アルドリッチ社製)を用い、HindIII及びSmaI(いずれもタカラ社製)にて処理し、アガロースゲル電気泳動により4.7千塩基長のバンドを切り出し、精製した。得られたインサート断片及びベクター断片をタカラ社製DNA ligation kit<Mighty Mix>によりライゲーションを行うことで、発現用プラスミドpFLAG-GoLucを得た。さらに、このプラスミドからFLAG配列を除去したプラスミドを作製するために、配列番号8及び9に示すプライマ及びKOD plus neo(東洋紡社製)を用いて94℃にて2分処理したのち、98℃にて10秒、68℃にて3分、のサイクルを30回繰り返して行うインバースPCRにより約5.7千塩基長のDNA断片を得た。得られた断片はT4 Polynuceotide kinase(東洋紡社製)にて5'末端をリン酸化したのち、DNA ligation kit<Mighty Mix>によりライゲーションを行うことで、発現用プラスミドpΔFLAG-GoLucを得た。
acaagcttat gaagttagca ctgttactc (配列番号6)
aacccgggtt actgttgtag gttatacat (配列番号7)
atgaagttag cactgttact c (配列番号8)
ggtagatcaa ttctgacggt t (配列番号9)。
哺乳類細胞で生産した発光ゴカイ組換え発光酵素の発光活性を評価した。
30μLの10mM Trisバッファーに、発光酵素粗抽出液1μLとNaClおよびMgCl2をそれぞれ最終濃度230mM、15mMとなるように加えた混合液に発光基質粗抽出液1μLを添加した
Claims (5)
- 下記いずれかの発光酵素タンパク質:
(i)配列番号2のアミノ酸配列を含む発光酵素タンパク質、
(ii)配列番号2のアミノ酸配列において1又は複数のアミノ酸残基が置換、付加又は欠失したアミノ酸配列を含み、かつルシフェラーゼ活性を有する発光酵素タンパク質、
(iii)配列番号2のアミノ酸配列と90%以上の同一性を有するアミノ酸を含む発光酵素タンパク質、
(iv)配列番号10の塩基配列によりコードされるアミノ酸配列を含む発光酵素タンパク質、
(v)配列番号10の塩基配列において1又は複数の塩基が置換、付加又は欠失した塩基配列によりコードされるアミノ酸配列を含み、かつルシフェラーゼ活性を有する発光酵素タンパク質、及び
(vi)配列番号10の塩基配列と90%以上の同一性を有する塩基配列によりコードされるアミノ酸配列を含む発光酵素タンパク質。 - ピーク強度の発光波長が、490〜530nmである、請求項1に記載の発光酵素タン
パク質。 - 請求項1又は2に記載の発光酵素タンパク質をコードする核酸。
- 請求項1又は2に記載の発光酵素タンパク質をコードする核酸を含む、遺伝子構築体。
- 請求項4に記載の遺伝子構築体が導入された細胞。
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JP4484429B2 (ja) | 2002-12-06 | 2010-06-16 | アトー株式会社 | 高分泌型ウミボタル類縁発光酵素のタンパク質 |
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