JP5692738B2 - ウイルスの濃縮方法および磁性体組成物 - Google Patents
ウイルスの濃縮方法および磁性体組成物 Download PDFInfo
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- JP5692738B2 JP5692738B2 JP2010045753A JP2010045753A JP5692738B2 JP 5692738 B2 JP5692738 B2 JP 5692738B2 JP 2010045753 A JP2010045753 A JP 2010045753A JP 2010045753 A JP2010045753 A JP 2010045753A JP 5692738 B2 JP5692738 B2 JP 5692738B2
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- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
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- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
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- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
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Description
本発明にかかるウイルスの濃縮方法は、糖鎖固定化金属ナノ粒子が第一の磁性体に結合した構造を有する糖鎖固定化磁性金属ナノ粒子と、上記糖鎖固定化磁性金属ナノ粒子よりも平均粒子径が大きい第二の磁性体と、検体とを含有する混和物に磁力を加える工程を含み、上記糖鎖固定化金属ナノ粒子は、リガンド複合体が、硫黄原子によって金属ナノ粒子と結合した構造を有し、上記リガンド複合体は、リンカー化合物のアミノ基に、還元末端を有する糖鎖が結合した構造を有し、上記リンカー化合物は、分子内にアミノ基と、硫黄原子と、主鎖に炭素−窒素結合を有する炭化水素鎖とを備える化合物である。
で表される構造を有する化合物。
で表される構造を有する化合物。
で表される構造を有する化合物。
で表される構造を有する化合物。
で表される構造を有する化合物。
で表される構造を有し、Xが以下の一般式(7)で表される構造を有する化合物。
で表される構造を有する化合物。
本発明にかかる磁性体組成物は、糖鎖固定化金属ナノ粒子が第一の磁性体に結合した構造を有する糖鎖固定化磁性金属ナノ粒子と、上記糖鎖固定化磁性金属ナノ粒子よりも平均粒子径が大きい第二の磁性体と、を含有する磁性体組成物であって、上記糖鎖固定化金属ナノ粒子は、リガンド複合体が、硫黄原子によって金属ナノ粒子と結合した構造を有し、上記リガンド複合体は、リンカー化合物のアミノ基に、還元末端を有する糖鎖が結合した構造を有し、上記リンカー化合物は、分子内にアミノ基と、硫黄原子と、主鎖に炭素−窒素結合を有する炭化水素鎖とを備える化合物である。
糖鎖固定化金属ナノ粒子が第一の磁性体に結合した構造を有する糖鎖固定化磁性金属ナノ粒子を含む溶液と、上記糖鎖固定化磁性金属ナノ粒子の末端に位置する糖鎖を認識するタンパク質とを混和することによって、糖鎖とタンパク質とを相互作用させ、糖鎖−タンパク質相互作用体を生成させることにより、糖鎖−タンパク質相互作用を測定することができる。以下、糖鎖−タンパク質相互作用を測定する方法を「糖鎖‐タンパク質相互作用の測定方法」という。
一実施形態において、上記糖鎖−タンパク質相互作用体からタンパク質を回収する方法は、糖鎖固定化磁性金属ナノ粒子を含む溶液と、上記糖鎖固定化磁性金属ナノ粒子の末端に位置する糖鎖を認識するタンパク質とを混和して糖鎖とタンパク質とを相互作用させ、糖鎖−タンパク質相互作用体を生成させる工程と、当該糖鎖−タンパク質相互作用体と水とを混和した混和液のpHを5以下とする工程と、を含んでいる。
50mMの塩化鉄(II)水溶液50μlと50mMの塩化鉄(III)水溶液25μlとを混合し、撹拌下、1Mのアンモニア水250μlを添加して、第一の磁性体である酸化鉄磁性ナノ粒子を含有する溶液を調製した。
次に、第二の磁性体として使用可能な磁性体の探索を行った。供試した磁性体を表3に示す。
50mMの塩化鉄(II)水溶液50μlに50mMの塩化鉄(III)水溶液25μlを加えて混合し、攪拌下、1Mのアンモニア水250μlを添加して、第一の磁性体である酸化鉄磁性ナノ粒子を含有する溶液を調製した。次に、50mMの塩化金酸(III)水溶液75μl、リガンド複合体の水溶液(濃度10mM)150μlおよび125mMの水素化ホウ素ナトリウム300μlを添加し、攪拌して、粗α−グルコース固定化磁性金ナノ粒子のコロイド溶液を調製した。なお、上記リガンド複合体は、マルトース20mgと、上記一般式(3)で示されるリンカー化合物(n1=0、q=0)19mgとを、水:N,N−ジメチルアセトアミド:酢酸(10:10:1)5.5mlに溶解した後、還元アミノ化を行うことによって調製した。
エッペンドルフチューブに、PBS−Tに対して1.24mg/mlとなるように溶解させたConAを100μl、PBS−Tに対して1.0mg/mlとなるように溶解させたBSAを100μl分注し、実施例3で調製したα−グルコース固定化磁性金ナノ粒子のコロイド溶液を100μl添加してボルテックスミキサーを用いて10秒以上攪拌した。なお、上記PBS−Tとは、リン酸緩衝液に0.05%のデタージェントであるTween20を加えた溶液である。約2時間放置した後、実施例3と同様のネオジウム磁石を用いた磁気分離にて糖鎖−タンパク質相互作用体を沈殿させ、上清を回収した後、当該糖鎖−タンパク質相互作用体をPBS−Tおよび水で数回洗浄した。当該洗浄後、4mg/mlのグルコース溶液を100μl添加し、約1時間放置した。結果は、当該糖鎖−タンパク質相互作用体から解離したConAを、SDS−PAGE分析によって評価した。
実施例1に示したように、第二の磁性体を使用せず、糖鎖固定化磁性金属ナノ粒子のみを使用した場合は、磁力のみを加えることによっては、遠心分離を用いた場合に匹敵する濃縮効率を得ることはできなかった。そこで、第二の磁性体を使用せず、上記糖鎖固定化磁性金属ナノ粒子の粒子径を大きくすることによりこの問題を解決できないか検討した。
Claims (7)
- 糖鎖固定化金属ナノ粒子が第一の磁性体に結合した構造を有する糖鎖固定化磁性金属ナノ粒子と、上記糖鎖固定化磁性金属ナノ粒子よりも平均粒子径が大きい第二の磁性体と、検体とを含有する混和物に磁力を加える工程を含み、
上記糖鎖固定化金属ナノ粒子は、リガンド複合体が、硫黄原子によって金属ナノ粒子と結合した構造を有し、上記リガンド複合体は、リンカー化合物のアミノ基に、還元末端を有する糖鎖が結合した構造を有し、上記リンカー化合物は、分子内にアミノ基と、硫黄原子と、主鎖に炭素−窒素結合を有する炭化水素鎖とを備える化合物であり、
上記還元末端を有する糖鎖は、濃縮対象のウイルスが認識する糖鎖であることを特徴とするウイルスの濃縮方法。 - 上記混和物は、上記糖鎖固定化磁性金属ナノ粒子の糖鎖に検体を接触させて得られた検体接触磁性金属ナノ粒子に上記第二の磁性体を混和することによって得られることを特徴とする請求項1に記載のウイルスの濃縮方法。
- 上記糖鎖固定化磁性金属ナノ粒子の平均粒子径が1nm以上100nm未満であり、上記第二の磁性体の平均粒子径が100nm以上100μm以下であることを特徴とする請求項1または2に記載のウイルスの濃縮方法。
- 上記糖鎖固定化磁性金属ナノ粒子と上記第二の磁性体との重量比は、1:1×103〜1:1×1011であることを特徴とする請求項1から3のいずれか1項に記載のウイルスの濃縮方法。
- 上記第一の磁性体および上記第二の磁性体は、それぞれ独立して、酸化鉄、マグネタイトまたはフェライトであることを特徴とする請求項1から4のいずれか1項に記載のウイルスの濃縮方法。
- 糖鎖固定化金属ナノ粒子が第一の磁性体に結合した構造を有する糖鎖固定化磁性金属ナノ粒子と、上記糖鎖固定化磁性金属ナノ粒子よりも平均粒子径が大きい第二の磁性体と、を含有する磁性体組成物であって、
上記糖鎖固定化金属ナノ粒子は、リガンド複合体が、硫黄原子によって金属ナノ粒子と結合した構造を有し、上記リガンド複合体は、リンカー化合物のアミノ基に、還元末端を有する糖鎖が結合した構造を有し、上記リンカー化合物は、分子内にアミノ基と、硫黄原子と、主鎖に炭素−窒素結合を有する炭化水素鎖とを備える化合物であり、
上記還元末端を有する糖鎖は、濃縮対象のウイルスが認識する糖鎖であることを特徴とする磁性体組成物。 - 少なくとも、請求項6に記載の磁性体組成物と、磁石とを備えることを特徴とする濃縮装置。
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