JP6692811B2 - 高速でラベル化されたn−グリカンに対する液体クロマトグラフィー較正方法 - Google Patents
高速でラベル化されたn−グリカンに対する液体クロマトグラフィー較正方法 Download PDFInfo
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- JP6692811B2 JP6692811B2 JP2017525943A JP2017525943A JP6692811B2 JP 6692811 B2 JP6692811 B2 JP 6692811B2 JP 2017525943 A JP2017525943 A JP 2017525943A JP 2017525943 A JP2017525943 A JP 2017525943A JP 6692811 B2 JP6692811 B2 JP 6692811B2
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Description
無し。
放出されたN−グリカンの、HILIC分析用、高速標識化試薬を用いた高速調製
本実施例では、どのようにして糖タンパク質から、30分間で、完全な脱グリコシル化を伴って、標識化(本明細書では「ラベル化」とも呼ぶ)N−グリカンを、分析の準備ができたサンプルに調製するかを説明する。発明者らのプロセスは、GLYCOWORKS(商標)RAPIFLOUR−MS(商標)N−グリカンキットとして知られているキットにより容易に実行可能になる、合理的なプロトコルである。ラベル化されたN−グリカンに対する感度は、これまでの蛍光及びMS検出よりも少なくとも2〜100倍に増加しており、テトラシアル酸化されたN−グリカンを中和するロバスト性のある固相抽出(「SPE」)に基づいた正確なプロファイリングを提供可能である。Lauber,Mら、Rapid Preparation of Released N−Glyans for HILIC Analysis Using a Labeling Reagent that Facilitates Sensitive Fluorescence and ESI−MS Detection,Anal.Chem.、2015年、第97巻、5401〜5409頁を参照。なお、同論文は参照により、本明細書に組み込まれる。
高速でラベル化されたデキストランラダーの調製
デキストランの還元型アミノ化、カップリング手順
100mgのデキストラン5000を正確に計量し、8mLのバイアル瓶に入れる。次に、2800μLのDMSOを、8mLのバイアル瓶にピペットで移し、デキストランが溶解するまで攪拌する。次に実際に重量を測定して記録する。
本手順は、高速標識化試薬がモル濃度で100〜200倍の過剰状態で、高速標識化反応を実行するために設計されている。4.0±0.3mgのエタノールアミノデキストランを、50mMのHEPES 500μLの、pH=7.9中に溶解させる(水酸化ナトリウムを用いて遊離酸から滴定される)。300μLの無水のDMFを添加する。このデキストラン溶液を用いて、100±0.5mgの高速標識化試薬を溶解させる。室温で10分間、反応を進行させておく。定期的に(20〜30秒ごとに)、反応混合物をかき混ぜ/攪拌する。室温でのインキュベーション完了後、反応混合物を7.6mLのACNで希釈する。SPEカートリッジに入れる直前に、反応混合物を希釈するのが最も好ましい。
6mLの水と6mLの85% ACNで洗浄する。ACNで希釈した反応混合物を、それぞれ4.5mL(およその体積)の量の2つの部分にわけて、カートリッジに入れる。ギ酸:水:ACNが1:9:90の混合液6mLで3回洗浄する。pH調製しない200mMの酢酸アンモニウムのそれぞれ4mLの量3つで、5%のACNを希釈する。600μLずつ分配し、遠心分離真空蒸発により乾燥させる。
高速でラベル化されたエタノールアミノデキストラン、高速でラベル化されたデキストランに対する実験条件と代表的なデータ。
高速でラベル化されたデキストランエタノールアミノのバッチ1〜3に対する実験条件、高速でラベル化されたデキストラン液体クロマトグラフィーが用いられて、実施例2で調製したようなラベル化されたデキストランラダーの蛍光及びMS特性を分析した。カラムは、体積比70%のHPLCグレードのアセトニトリル(ACN)/体積比30%のHPLCグレードの水で流した。カラムは、次に最初の注入を行う前に、移動相条件で均衡化させられる。直ぐ下に示す表2及び表3は、分析おいて用いられるHILICのUPLC/FLR/MS条件を提供する。
クロマトグラフ保持値を、還元型アミノ化を通じて、一級アミンを有する化合物で調節すること
第2の高速でラベル化されたデキストランが、実施例2において提案されるエタノールアミンをプロピルアミンに置き換えて調製された。結果として得られる、高速でラベル化されたプロピルアミノデキストランのクロマトグラフィー保持値を、上に言及した高速でラベル化されたエタノールアミノデキストランと、以下に概要を示す実験条件にしたがって比較した:
カラムは、体積比70%のHPLCグレードのアセトニトリル(ACN)/体積比30%のHPLCグレードの水で流した。カラムは、次に最初の注入を行う前に、移動相条件で均衡化させられる。表5は、分析において用いられたHILIC UPLC/FLR条件を示す。
還元糖類への、多官能性の組み込み
より広く言えば、本方法は、別々のラベル化部分(本明細書においては、「標識」または「ラベル」とも呼ぶ)を、1つは還元型アミノ化反応を介して、別の1つは高速標識化処理により組み込むことを通じて、還元グリカン及び糖類に、ある化学的性質を付与することが可能なものである。
Claims (4)
- 液体クロマトグラフィーにおいて有用な検量体を作製する方法であって、
アルデヒド基を有する還元グリカンを提供するステップと、
一級アミンを有する化合物と前記還元グリカンの前記アルデヒド基を反応させて、当該アルデヒド基が二級アミンに転換されている中間化合物を生成するステップと、
前記中間化合物を標識化試薬と混合し、前記中間化合物を前記標識化試薬でラベル化して、N−グリカンを前記標識化試薬で標識化することにより生成される、ラベル化されたN−グリカンと、実質的に同じ光学的特性を有するラベル化されたデキストランラダーを生成するステップと、を含む、方法。 - グリカンデータベースの調査において有用なグルコース単位を計算する方法であって、
生体サンプルから複数のN−グリカンを調製するステップと、
前記N−グリカンを、標識化試薬と反応させて、複数のラベル化されたN−グリカンを生成するステップと、
還元グリカンを提供するステップと、
一級アミンを有する化合物と前記還元グリカンを反応させて、二級アミンを有する中間化合物を生成するステップと、
前記中間化合物を前記標識化試薬と混合し、前記中間化合物を前記標識化試薬でラベル化して、前記ラベル化されたN−グリカンと、実質的に同じ光学的特性を有するラベル化されたデキストランラダーを生成するステップと、
前記ラベル化されたN−グリカンの親水性相互作用クロマトグラフィーによる分離を、前記ラベル化されたデキストランラダーで較正して、前記ラベル化されたN−グリカンに対するピーク保持時間を提供するステップと、
前記ピーク保持時間をグルコース単位に転換するステップと、を含む、方法。 - N−グリカンの構造を決定する方法であって、
生体サンプルから複数のN−グリカンを調製するステップと、
前記N−グリカンを標識化試薬と反応させて、複数のラベル化されたN−グリカンを生成するステップと、
前記複数のラベル化されたN−グリカンと実質的に同じ光学的特性を有するラベル化されたデキストランラダーを生成するステップであって、
還元グリカンを提供するステップと、
一級アミンを有する化合物と前記還元グリカンを反応させて、二級アミンを有する中間化合物を生成するステップと、
前記中間化合物を前記標識化試薬と混合し、前記中間化合物を前記標識化試薬でラベル化して、前記ラベル化されたデキストランラダーを生成するステップと、を含む、ステップと、
前記ラベル化されたN−グリカンの親水性相互作用クロマトグラフィーによる分離を、前記ラベル化されたデキストランラダーで較正して、前記ラベル化されたN−グリカンに対するピーク保持時間を提供するステップと、
前記ピーク保持時間を計算されたグルコース単位に転換するステップと、
計算された前記グルコース単位をグルコース単位データベースと比較して、前記複数のN−グリカンの構造を識別するステップと、を含む、方法。
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