JPWO2006109485A1 - 質量分析法 - Google Patents
質量分析法 Download PDFInfo
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- JPWO2006109485A1 JPWO2006109485A1 JP2007512470A JP2007512470A JPWO2006109485A1 JP WO2006109485 A1 JPWO2006109485 A1 JP WO2006109485A1 JP 2007512470 A JP2007512470 A JP 2007512470A JP 2007512470 A JP2007512470 A JP 2007512470A JP WO2006109485 A1 JPWO2006109485 A1 JP WO2006109485A1
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Images
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- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
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Abstract
Description
1. 縮合多環炭化水素を有する標識化合物を分子と結合させて標識された分子を形成する工程と、該標識された分子のMSn(n>1)解析を行う工程とを備えたことを特徴とする分子の質量分析法;
2. 標識化合物がピレン誘導体化合物であることを特徴とする1.に記載の質量分析法;
3. 糖鎖である分子の質量分析法であって、(1)該分子の還元末端をヒドラジド基またはアミノ基を有するピレン誘導体化合物で標識して、標識化中間体を得る工程と、(2)標識化中間体を還元して、還元標識された分子を得る工程と、(3)該還元標識された分子のMSn(n>1)解析を行う工程とを備えたことを特徴とする分子の質量分析法;
4. 糖鎖または糖タンパク質である分子の質量分析法であって、(1)該分子中の糖鎖部分のみを酸化して、酸化生成物を得る工程と、(2)酸化生成物をヒドラジド基またはアミノ基を有するピレン誘導体化合物で標識して、標識化中間体を得る工程と、(3)標識化中間体を還元して、還元標識された分子を得る工程と、(4)該還元標識された分子のMSn(n>1)解析を行う工程とを備えたことを特徴とする分子の質量分析法;
5. タンパク質または糖タンパク質である分子の質量分析法であって、(1)該分子内のカルボキシ基またはアミノ基を利用して、該分子をピレン誘導体化合物で標識し、標識された分子を得る工程と、(2)該標識された分子のMSn(n>1)解析を行う工程とを備えたことを特徴とする分子の質量分析法
6. 1.から5.のいずれかに記載の質量分析法によって得られるスペクトル;
7. 6.に記載のスペクトルから得られる情報;および
8. 7.に記載の情報を集積したデータ集積体
である。
「分子」とは、糖、糖鎖、タンパク質、核酸、複合糖質(糖タンパク質、糖脂質など)などであって、天然から調製する他、化学的または酵素学的に調製するものを含む。なお、本発明における用語「タンパク質」はペプチドを含み、本発明における用語「糖タンパク質」は糖ペプチドを含む。また、生体に含まれる分子の部分構造を有するものや生体に含まれる分子を模倣して作製されたものを含む。
標識化合物は、縮合多環炭化水素誘導体である。「縮合多環炭化水素誘導体」とは、ナフタレン、アントラセン、ピレンなどの縮合多環炭化水素部分と、分析対象の分子と結合することが可能である反応性官能基と、必要に応じて該ピレン環と該反応性官能基とを連結するスぺーサー部分とを有する化合物をいう。
「質量分析法」とは、マトリクス支援レーザー脱離イオン化(MALDI)法、レーザー脱離(LD)法、高速電子衝撃(FAB)法、エレクトロスプレーイオン化(ESI)法、大気圧化学(APCI)法などのイオン化方法によって分子を含む試料をイオン化し、次いで、飛行時間法(タイムオブフライト法、TOF法)、二重収束法、四重極集束法などを用いて、イオン化した分子を質量/電荷比(m/z)に従って分離し検出する方法である。
それぞれ血液型抗原HまたはLeaを有し、互いに分子量および組成式が同一で構造異性体の関係にある糖鎖であるラクト−N−フコペンタオースI(lacto-N-fucopentaose I、LNF−I、式(1)の化合物)およびラクト−N−フコペンタオースII(lacto-N-fucopentaose II、LNF−II、式(2)の化合物)をピレン誘導体化合物(PBH)で標識し、次いで還元して還元標識糖を得た。
実施例1で得られた還元標識LNF−Iおよび還元標識LNF−IIのそれぞれを純水に溶解し、それら還元標識糖1pmolをMALDIターゲットプレートに塗布した。2,5−ジヒドロキシ安息香酸(DHBA)を40%アセトニトリル−純水に溶解させたマトリクス溶液を、ターゲットプレート上の標識糖溶液と混合し、そして乾固した。MALDI−TOF MS装置(Axima−CFR plus(Shimadzu/Kratos))を用いてMS分析を行った。図1Aに還元標識LNF−Iから得られたスペクトルを示し、図1Bに還元標識LNF−IIから得られたスペクトルを示す。図1Aおよび図1Bから分かるように、いずれの還元標識糖からもm/z=1162.5である[M+Na]+が十分量検出された。
LCポンプに接続したESI−MS装置LCQ(Thermo Electron)を用いて、実施例1で得られた還元標識LNF−Iおよび還元標識LNF−IIのそれぞれのMS分析を行った。還元標識LNF−Iおよび還元標識LNF−IIのそれぞれは、50%アセトニトリル−純水に溶解させて1pmol/mLの溶液とし、該溶液の1mLをESI−MS装置に注入した。また、移動相として、0.1%TFAを含む純水/90%アセトニトリル−純水(50/50)を用い、移動相の流速は、3mL/minであった。
LNF−IおよびLNF−IIのそれぞれについて、還元剤NaBH4による還元を行わなかったことを除いて実施例1の手順を繰り返して、PBHで標識された標識LNF−Iおよび標識LNF−IIを得た。標識LNF−Iおよび標識LNF−IIのそれぞれを、実施例2に記載の手順に従ってMALDI−TOF MS分析を行った。しかしながら、標識LNF−Iおよび標識LNF−IIから得られた親イオンのイオン強度は、還元標識LNF−Iおよび還元標識LNF−IIに比較して1/10以下であったため、MSn(n>1)解析を実施することは困難であった。
以下に示す化合物(3)〜(5)を、実施例1の方法でピレン誘導体化合物(PBH)を用いた還元標識した後に、四重極型イオントラップ(QIT)を装備したMALDI−QIT−TOFMS(Axima−QIT(Shimadzu/Kratos))を用いてnegative-ion MALDI−TOF MS/MS測定を行った。ここで、2段階目のMS測定においては、各化合物の親イオンをプリカーサーイオンとして用いた。
以下に示す化合物(6)を、実施例1の方法でPBHを用いた還元標識した後に、MALDI−QIT−TOFMS(Axima−QIT(Shimadzu/Kratos))を用いてnegative-ion MALDI−TOF MS/MS測定を行った。
それぞれ血液型抗原HまたはLeaを有し、構造異性体の関係にあるLNF−I(化合物(1))およびLNF−II(化合物(2))を、還元末端のグルコースではなく、非還元末端のガラクトースにピレン誘導体化合物を導入して標識した。以下に、具体的方法を示す。最初に、還元末端のグルコースにピレン誘導体化合物の標識が導入されないようにするために、LNF−IおよびLNF−IIを、2時間にわたって濃度10mg/mlの水素化ホウ素ナトリウム溶液中に放置して還元した。次いで、ガラクトースオキシダーゼ(6単位)を加えて、37℃で一晩放置して、ガラクトースを酸化しアルデヒド基を生成させた。反応終了後、酵素をメタノールにより変性させた後、フィルターを用いて反応液を濾過して、酵素を除去した。そして、濾液を乾固させ、実施例1の方法により、PBHを用いて残留物を還元標識した。
Claims (8)
- 分子の質量分析法であって、縮合多環炭化水素を有する標識化合物を分子と結合させて標識された分子を形成する工程と、該標識された分子のMSn(n>1)解析を行う工程とを備えたことを特徴とする分子の質量分析法。
- 前記標識化合物がピレン誘導体化合物であることを特徴とする請求項1に記載の質量分析法。
- 分子の質量分析法であって、該分子は、糖鎖であり、および
(1)該分子の還元末端をヒドラジド基またはアミノ基を有するピレン誘導体化合物で標識して、標識化中間体を得る工程と、
(2)標識化中間体を還元して、還元標識された分子を得る工程と、
(3)該還元標識された分子のMSn(n>1)解析を行う工程と
を備えたことを特徴とする分子の質量分析法。 - 分子の質量分析法であって、該分子は、糖鎖および糖タンパク質から成る群から選択され、および
(1)該分子中の糖鎖部分のみを酸化して、酸化生成物を得る工程と、
(2)酸化生成物をヒドラジド基またはアミノ基を有するピレン誘導体化合物で標識して、標識化中間体を得る工程と、
(3)標識化中間体を還元して、還元標識された分子を得る工程と、
(4)該還元標識された分子のMSn(n>1)解析を行う工程と
を備えたことを特徴とする分子の質量分析法。 - 分子の質量分析法であって、該分子は、タンパク質および糖タンパク質から成る群から選択され、および
(1)該分子内のカルボキシ基、アミノ基またはSH基を利用して、該分子をピレン誘導体化合物で標識し、標識された分子を得る工程と、
(2)該標識された分子のMSn(n>1)解析を行う工程と
を備えたことを特徴とする分子の質量分析法。 - 請求項1から5のいずれかに記載の質量分析法によって得られるスペクトル。
- 請求項6に記載のスペクトルから得られる情報。
- 請求項7に記載の情報を集積したデータ集積体。
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