JP4271687B2 - リン酸化タンパク質の質量分析及びリン酸化位置分析用標識物質 - Google Patents
リン酸化タンパク質の質量分析及びリン酸化位置分析用標識物質 Download PDFInfo
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- JP4271687B2 JP4271687B2 JP2005518451A JP2005518451A JP4271687B2 JP 4271687 B2 JP4271687 B2 JP 4271687B2 JP 2005518451 A JP2005518451 A JP 2005518451A JP 2005518451 A JP2005518451 A JP 2005518451A JP 4271687 B2 JP4271687 B2 JP 4271687B2
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Description
Oda,Y.ら、Nature Biotechnology、2001年、第19巻、379-382頁
1)リン酸化タンパク質またはリン酸化ペプチドの一つ以上のセリン残基及び/またはスレオニン残基を脱リン酸化(dephosphorylation)する工程;
2)前記工程1の脱リン酸化されたアミノ酸残基をR-L-Gの構造からなるペプチド反応性標識物質(tag)で標識する工程であって、Rは脱リン酸化されたアミノ酸部位と選択的に結合する親核性作用基、Gは陽イオン形成を誘発させる親陽性子性作用基、Lは前記親核性作用基と親陽性子性作用基とを連結させるリンカー(linker)である、工程;及び
3)工程2で標識されたタンパク質またはペプチド誘導体を陽イオン質量分析方法で検出する工程
を含むリン酸化タンパク質またはリン酸化ペプチドの質量分析方法またはリン酸化位置分析方法であって、
前記工程2の標識物質に、モノ-N-保護グアニジノ基、ジ-N-保護グアニジノ基、N'-保護グアニジノ基及びアミンが保護されていないグアニジノ基からなる群より選択される基を親陽性子性作用基(G)として使用する、リン酸化タンパク質またはリン酸化ペプチドの質量分析方法またはリン酸化位置分析方法を提供する。
1)リン酸化タンパク質またはリン酸化ペプチドの一つ以上のセリン残基及び/またはスレオニン残基を脱リン酸化(dephosphorylation)する工程;
2)前記工程1の脱リン酸化されたアミノ酸残基をR-L-Gの構造からなるペプチド反応性標識物質(tag)で標識する工程であって、Rは脱リン酸化されたアミノ酸部位と選択的に結合する親核性作用基、Gは陽イオン形成を誘発させる親陽性子性作用基、Lは前記親核性作用基と親陽性子性作用基とを連結させるリンカー(linker)である、工程;及び
3)工程2で標識されたタンパク質またはペプチド誘導体を陽イオン質量分析方法で検出する工程
を含むリン酸化タンパク質またはリン酸化ペプチドの質量分析方法またはリン酸化位置分析方法であって、
前記工程2の標識物質に、モノ-N-保護グアニジノ基、ジ-N-保護グアニジノ基、N'-保護グアニジノ基及びアミンが保護されていないグアニジノ基からなる群より選択される基を親陽性子性作用基(G)として使用することを特徴とするリン酸化タンパク質またはリン酸化ペプチドの質量分析方法またはリン酸化位置分析方法を提供する。
式中、XがHである場合はジヒドロアラニンであり、CH3である場合にはβ-メチルジヒドロアラニンであり、Tagは標識物質を示す。
分析しようとする標準タンパク質またはタンパク質抽出物は、精製の便宜のため公知の方法によって試料前処理過程を経た。詳細には、タンパク質試料は、6M塩酸グアニジン(guanidine hydrochloride)で変性(denaturation)させ、TCEP(tris(2-carboxyethyl)phosphine)・HClを加えて37℃で1時間反応させてシステイン(cysteine)位置の二硫化物結合(disulfide bonde)を還元させた。また、タンパク質に存在できるO-連結オリゴ糖(O-linked oligosaccharide)は、塩基性の標識反応条件でリン酸基のようにβ離脱化反応を起こすことができるため、O-グリカナーゼ(O-glycanase)等を使用して標識反応前に予め除去した。しかし、本発明で標準タンパク質として使用した配列番号:1に記載されるβ-カゼイン(β-casein)の場合、O-連結オリゴ糖が存在するにも関わらず、最適化された標識反応条件でO-連結オリゴ糖の離脱化副反応は観察されなかった。還元されたシステインの位置は、ヨードアセトアミド(iodoacetamide)等のアルキル化試薬を使用して保護(blocking)するかまたは過ギ酸(performic acid)を使用して酸化させた。使用した過剰量の試薬は、ゲル濾過(gel filtration)または透析(dialysis)等の方法で除去し、トリプシン(trypsin)等の加水分解酵素を使用してタンパク質を切断した(digestion)。バリウム(barium)陽イオンを触媒に使用してヒドロキシド(hydroxide)イオンを塩基として使用して標識反応を実施した。また、標識反応を実施する前に、固定化金属アフィニティークロマトグラフィー(immobilized metal affinity chromatography, IMAC)方法でリン酸化ペプチドだけを濃縮した後、標識反応を実施することもできる。
グアニジノエタンチオール(guanidinoethanethiol、以下「GET」と略称する)20μmolを蒸溜水30μlに溶解して標識試薬溶液を準備した。または、標識試薬としてGETの二硫(disulfide)前駆体を使用する場合には、GEDS・2HCl (guanidinoethanedisulfide 2hydrochloride)10μmolを蒸溜水10μlに溶解した後、TCNEP(tris(2-cyanoethyl)phosphine)(500mM)20μlを加え、45℃で約30分間放置して前駆体を活性化させた後、標識試薬溶液として使用した。前記実施例1で前処理したタンパク質試料を真空乾燥した試料ペプチド(約20μl)を蒸溜水13μlに溶解した後、これを前記で準備した標識試薬溶液43μlと混合した。前記混合した溶液に5.0N NaOH溶液6μl、1.0M BaCl2溶液2μlを続けて加え、45℃で約2〜3時間反応させた。前記反応溶液の温度を5℃以下に冷却し、1.0%酢酸水溶液を加えて中和させた。0.1%酢酸またはトリフルオロ酢酸(trifluoroacetic acid)水溶液で適切に希釈してペプチドの分析を進行した。
液体クロマトグラフィー/マトリックス補助レーザー脱着イオン化質量分析法(Liquid chromatography/The matrix-assisted laser desorption ionization mass spectrometry、以下「LC/MALDI MS」と略称する)及び液体クロマトグラフィー/電子噴霧イオン化質量分析法(Liquid chromatography/The electrospray ionization mass spectrometry,LC/ESI MS)等は、標識されたペプチドの分析に非常に有用である。標識反応に使用したすべての試料は、小さい分子量で極性が非常に大きい有機物質かまたは無機塩であるため、逆相クロマトグラフィー法を応用して標識ペプチド試料を精製することができる。続いて、ペプチド誘導体を濃度勾配溶出法(gradient elution)を利用して直ちにESI質量分析機に導入して質量分析を実施するか、またはMALDI試料プレートに連続的にローディング(loading)することによって質量分析(mass spectrometry, MS)及びMS/MS分析を実施できる。試料の精製及び分離のために、LCパッキング社のLCパッキングプロボト(Packings Probot)をLCパッキングウルチメートマイクロ-キャピラリー(Packing Ultimate micro-capillary)HPLCシステムに連結し、試料を連続的にMALDIプレートにローディングした。その後、AB 4700 プロテオミクス分析機(AB 4700 Proteomics Analyzer)(Applied Biosystems,Framingham,MA,米国)を使用してMALDI TOF/TOF(time-of-flight/time-of-flight)質量分析を実施した。
Claims (12)
2)工程1の脱リン酸化されたアミノ酸残基をR-L-Gの構造からなるペプチド反応性標識物質(tag)で標識する工程であって、Rは脱リン酸化されたアミノ酸部位と選択的に結合する親核性作用基、Gは陽イオン形成を誘発させる親陽性子性作用基、Lは前記親核性作用基と親陽性子性作用基とを連結させるリンカー(linker)である、工程;及び
3)工程2で標識されたタンパク質またはペプチド誘導体を質量分析方法で検出する工程を含む、リン酸化タンパク質またはリン酸化ペプチドの質量分析方法またはリン酸化位置分析方法であって、
工程2の標識物質に、モノ-N-保護グアニジノ基、ジ-N-保護グアニジノ基、N'-保護グアニジノ基及びアミンが保護されていないグアニジノ基からなる群より選択される基を親陽性子性作用基(G)として使用する、リン酸化タンパク質またはリン酸化ペプチドの質量分析方法またはリン酸化位置分析方法。
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