JP2011521898A - 組換え脱アミドグリアジン抗原 - Google Patents
組換え脱アミドグリアジン抗原 Download PDFInfo
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- JP2011521898A JP2011521898A JP2011505225A JP2011505225A JP2011521898A JP 2011521898 A JP2011521898 A JP 2011521898A JP 2011505225 A JP2011505225 A JP 2011505225A JP 2011505225 A JP2011505225 A JP 2011505225A JP 2011521898 A JP2011521898 A JP 2011521898A
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- antigen
- gliadin
- fusion protein
- tag
- ttg
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Abstract
Description
本願は2008年4月21日に出願された米国特許出願第61/046693号の優先権の利益を主張するものであり、その全部を本願明細書に引用したものとする。
本明細書で用いられる時、用語「接触させる」とは、反応できるように少なくとも2つの異なる種を接触させる過程をいう。結果として生じた反応生成物は、加えた試薬間の反応から直接に又は反応混合物中で生成できる1以上の加えた試薬の中間体から生成されたものである。
本発明はセリアック病を検出するための抗原及び方法を提供する。抗原には固相支持体物質上に固定されたグリアジン融合タンパク質が含まれる。グリアジン融合タンパク質には組換え脱アミドグリアジン及びタグの両方が含まれる。任意に抗原は組織トランスグルタミナーゼ(tTG)を含むことができる。存在する場合、tTG-グリアジン融合タンパク質複合体を形成するために、固相支持体に固定される前に、例えばアミノ基転移を通してグリアジン融合タンパク質とtTGとを共有結合することができる。固相支持体にtTG-グリアジン融合タンパク質を固定した後に、好適な架橋剤を用いてグリアジン融合タンパク質とtTGとを架橋することができる。
本発明において有用なグリアジン融合タンパク質は、組換え脱アミドグリアジンとタグを含む。多くの組換えグリアジンタンパク質が本発明の方法において有用であることが、当業者に認識される。いくつかの実施形態において、組換えグリアジンタンパク質はD2(Aleanzi他, Clin Chem 2001, 47 (11), 2023)、ペプチド配列:QPEQPQQSFPEQERPF(配列番号:1)を含むことができる。組換えグリアジンタンパク質は以下の式で表されるD2の変異体をも含むことができる:
X1PX2X3PX4X5SFPX6X7X8RPF
ここで、各Xはグルタミン(Q)又はグルタミン酸(E)のいずれかであって、少なくとも1つのXはグルタミンであり、少なくとも1つのXはグルタミン酸である(配列番号:6)。本発明の組換えグリアジンタンパク質は、GGGGS等のいかなる好適なスペーサーで分離されているD2又はその変異体の二量体又は三量体とすることもできる(配列番号:7)。本発明において他のスペーサーも有用であることが当業者に理解される。
本発明の使用のための固相支持体物質は、次の性質によって特徴づけられる:(1)スクリーニングに用いられる液層中での不溶性;(2)他の全ての支持体から独立した三次元の移動性;(3)グリアジン融合タンパク質又はtTG-グリアジン融合タンパク質複合体の多数のコピーを含むこと;(4)スクリーニング検定条件への適合;及び(5)検定条件への不活性。好ましい支持体は、限定されないが、ヒドロキシル、カルボキシル、アミノ、チオール、アルデヒド、ハロゲン、ニトロ、シアノ、アミド、尿素、炭酸塩、カルバミン酸塩、イソシアネート、スルホン、スルホン酸塩、スルホンアミド、スルホキシド等の反応性官能基をグリアジン融合タンパク質とtTGの結合のために有する。
いくつかの実施形態において、本発明は、固相支持体を、タグに共有結合された組換え脱アミドグリアジンを有するグリアジン融合タンパク質に接触させて、タグを介してグリアジン融合タンパク質が修飾固相支持体に固定された修飾固相支持体を形成することを含む方法により作製された、セリアック病を検出するための抗原を提供する。このため、セリアック病を検出するための抗原が作製される。
組換え脱アミドグリアジンポリペプチドを作製するために、本発明は組換え遺伝学の分野におけるルーチン技術を用いることができる。本発明の使用の一般的な方法を開示する基本的な教科書として、Sambrook & Russell, Molecular Cloning, A Laboratory Manual (第3版, 2001); Kriegler, Gene Transfer and Expression: A Laboratory Manual (1990);及びCurrent Protocols in Molecular Biology (Ausubel et al., eds., 1994-1999)が挙げられる。
本発明のグリアジン融合タンパク質は、当該技術分野において知られている任意の有用な固定方法で、任意の有用な固相支持材に固定することができる。固相支持体へのグリアジン融合タンパク質の固定は、共有又はイオン結合形成、水素結合、ファンデルワールス力、及び抗体−抗原相互作用を介することができる。本発明において他の固定方法が有用であることが、当業者に理解される。
本発明は、被験者がセリアック病に罹患しているか否かを決定する方法を提供する。方法には、上述したように、被験者からの体液のサンプルを、固相支持体に固定されたグリアジン融合タンパク質を有する抗原と接触させることを含む。該方法には、抗原に特異的に結合するようになったいかなる抗体を検出することをも含み、これにより被験者におけるセリアック病の存在が示される。
いくつかの実施形態において、本発明は、上述された抗原、検出試薬及びバッファー、塩、安定剤及び説明書のうち任意に少なくとも1つを含むキットを提供する。
実施例1:D2三量体を用いたグリアジン融合タンパク質の作製
この実施例は、D2三量体を用いて本発明のグリアジン融合タンパク質を作製する方法を提供する。
この実施例は、一般的に固相支持体にグリアジン融合タンパク質(GST-D2三量体)を固定することを含む、tTGの非存在下で本発明の抗原を調製する方法を提供する。
8mgのカルボキシル修飾電磁ビーズを超遠心チューブに入れる。70%EtOH(エタノール)中でpH6.1の50mM 2-(N-モルホリノ)エタンスルホン酸(MES)800μLをチューブに加える。撹拌し、磁力的に分離する。上清をピペットで取り、捨てる。もう1度繰り返す。
800μLのブロッキングバッファー(界面活性剤、保存料及びブロッカーを有する高タンパク質含有緩衝食塩水)をチューブに加える。2°〜8℃で60分間撹拌する。磁気的に分離する。上清をピペットで取り、捨てる。
この実施例は、アミノ基転移反応を通してtTGとグリアジン融合タンパク質が複合体となるように、グリアジン融合タンパク質(GST-D2三量体)及びtTGが固相支持体に固定されることを含む、tTGを用いた本発明の抗原を作製する方法を提供する。次いで、tTGとグリアジン融合タンパク質は架橋される。
8mgのカルボキシル修飾電磁ビーズを超遠心チューブに入れる。70%EtOH(エタノール)中でpH6.1の50mM 2-(N-モルホリノ)エタンスルホン酸(MES)800μLをチューブに加える。撹拌し、磁気的に分離する。上清をピペットで取り、捨てる。もう1度繰り返す。
800μLのブロッキングバッファー(界面活性剤、塩化カルシウム、保存料及びブロッカーを有する緩衝食塩水を含む高タンパク質)をチューブに加える。2°〜8℃で60分間撹拌する。磁気的に分離する。上清をピペットで取り、捨てる。
この実施例は、本発明の組換え脱アミドグリアジン抗原を用いたセリアック病を検出する方法を提供する。
・機器(Bio-Rad Laboratoriesが製造したBioPlex 2200(登録商標))がサンプルチューブから5μLのサンプルを吸引し、45μLの洗浄バッファー(界面活性剤と保存料を含むリン酸緩衝食塩水)に追跡される反応槽(RV)に供給する。
・100μLのサンプル希釈剤(界面活性剤、保存料及びブロッカーを含む緩衝食塩水)と150μLの洗浄バッファーをRVに加える。
・RVを37℃で130秒間(2.2分)インキュベートする。
・100μLの分子試薬(それぞれ実施例2及び3で作製された組換え脱アミドグアリジン抗原被膜ビーズ及びグリアジン融合タンパク質-tTG複合体抗原被膜ビーズの溶液、及び分子希釈剤)をRVに加える。最終サンプル希釈率は1/80である。
・時々撹拌しながら、混合物を37℃で1180秒間(19.7分)インキュベートする。
・ビーズを600、300、600μLの洗浄バッファーで3回洗浄する。
・50μLの結合試薬をRVに加える(結合希釈剤(界面活性剤、保存料及びブロッカーを含む緩衝食塩水)中の非ヒトIgA−フィコエリトリンの混合物)。
・時々撹拌しながら、混合物を37℃で600秒間(10分)インキュベートする。
・ビーズを600、300、600μLの洗浄バッファーで3回洗浄する。
・50μLの洗浄バッファーをRVに加える。
・ルミネックス検出器モジュール(LDM)にビーズ懸濁液を吸引し、各特定されたビーズ領域の粒子のメジアン蛍光を測定する。
実施例2の手順にしたがって、D2三量体を含む第1の抗原とD2ペプチドモノマーを含む第2の抗原が作製された。2つの抗原を試験したところ、D2三量体抗原はDEペプチドモノマーよりも高い最大シグナルを達成した。図1を参照。
Claims (23)
- セリアック病を検出するための抗原であって、タグに共有結合で結合されてグリアジン融合タンパク質を形成している組換え脱アミドグリアジンを含んでなり、前記タグが固相支持体に固定されている抗原。
- 前記タグがグルタチオンS−トランスフェラーゼ(GST)及びHis-タグからなる群から選ばれる請求項1記載の抗原。
- 前記タグがGSTである請求項2記載の抗原。
- 前記抗原が更に組織トランスグルタミナーゼ(tTG)を含んでなり、tTG-グリアジン融合タンパク質複合体を形成している請求項2記載の抗原。
- 架橋剤によって、前記tTGと前記グリアジン融合タンパク質が共有結合されている請求項4記載の抗原。
- 前記架橋剤がヘテロ二官能性架橋剤及びホモ二官能性架橋剤よりなる群より選ばれるメンバーである請求項5記載の抗原。
- 前記架橋剤がホモ二官能性架橋剤である請求項6記載の抗原。
- 前記架橋剤がビス(スルホスクシンイミジル)スベレート(BS3)、エチレングリコールビス[スクシンイミジルスクシネート](EGS)、エチレングリコールビス[スルホスクシンイミジルスクシネート](スルホ−EGS)、ビス[2−(スクシンイミドオキシカルボニルオキシ)エチル]スルホン(BSOCOES)、ジチオビス(スクシンイミジル)プロピオネート (DSP)、3,3'-ジチオビス(スルホスクシンイミジルプロピオネート(DTSSP)、ジスクシンイミジルスベレート(DSS)、ジスクシンイミジルグルタレート(DSG)、メチルN-スクシンイミジルアジペート(MSA)、ジスクシンイミジルタータレート(DST)、1,5-ジフルオロ-2,4-ジニトロベンゼン (DFDNB)、1-エチル-3-[3-ジメチルアミノプロピル]カルボジイミド塩酸塩(EDC又はEDAC)、スルホスクシンイミジル-4-(N-マレイミドメチル)シクロヘキサン-1-カルボン酸(スルホ-SMCC)、N-ヒドロキシスルホスクシンイミド (スルホ-NHS)、ヒドロキシルアミン及びスルホ-LC-SPDP (N-スクシンイミジル 3-(2-ピリジルジチオ)-プロピオネート)及びスルホスクシンイミジル6-(3'-[2-ピリジルジチオ]-プロピオアミド)ヘキサン酸(スルホ-LC-SPDP)からなる群より選ばれるメンバーである請求項7記載の抗原。
- 前記架橋剤がビス(スルホスクシンイミジル)スベレート(BS3)である請求項8記載の抗原。
- 前記組換え脱アミドグリアジンが配列番号:2に対して95%同一性を有する請求項1記載の抗原。
- 前記組換え脱アミドグリアジンが配列番号2を有する請求項1記載の抗原。
- (a)固相支持体をグリアジン融合タンパク質に接触させるステップを含むプロセスから作製されるセリアック病を検出するための抗原であって、ここで前記グリアジン融合タンパク質は、前記グリアジン融合タンパク質がタグを介して固相支持体に固定されるように前記タグに共有結合で結合した組換え脱アミドグリアジンを含み、これによりセリアック病を検出するための前記抗原を作製することを特徴とする抗原。
- 前記タグがグルタチオンS−トランスフェラーゼ(GST)及びHis-タグからなる群から選ばれる請求項12記載の抗原。
- 前記プロセスが更に、接触ステップ(a)の前に、前記グリアジン融合タンパク質とtTGの間に少なくとも1つの共有結合を形成するために、前記グリアジン融合タンパク質を組織トランスグルタミナーゼ(tTG)と接触させることを含む請求項12記載の抗原。
- 前記プロセスが更に、(b)前記グリアジン融合タンパク質を前記tTGに架橋するために、前記抗原を架橋剤と接触させることを含む請求項14記載の抗原。
- 被験者がセリアック病に罹患しているか否かを決定する方法であって、(a)前記被験者からの体液のサンプルを請求項1記載の抗原と接触させ、及び(b)前記被験者のセリアック病の存在を示すものとして、前記抗原に特異的に結合するようになったいずれかの抗体をも検出することを含む方法。
- 前記サンプルが血液サンプルである請求項16記載の方法。
- 前記検出ステップが、ELISA、RIA及び免疫蛍光測定法からなる群より選ばれる測定法を用いて行われる請求項16記載の方法。
- 抗原に特異的な抗体がIgG及びIgAからなる群より選ばれる請求項16記載の方法。
- 請求項1記載の抗原、検出試薬及び随意にバッファー、塩、安定剤及び説明書からなる群より選ばれる少なくとも1つのメンバーを含むキット。
- 配列番号5を含む単離された核酸。
- 発現ベクター中の請求項21記載の単離された核酸。
- 前記発現ベクターが宿主細胞内にある請求項22記載の単離された核酸。
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EP2659901B1 (en) | 2015-01-21 |
US20090311727A1 (en) | 2009-12-17 |
JP6073940B2 (ja) | 2017-02-01 |
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AU2009239558A1 (en) | 2009-10-29 |
EP2659901A1 (en) | 2013-11-06 |
EP2276499A4 (en) | 2012-02-08 |
JP5694916B2 (ja) | 2015-04-01 |
WO2009131909A2 (en) | 2009-10-29 |
EP2276499A2 (en) | 2011-01-26 |
WO2009131909A3 (en) | 2010-01-07 |
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EP2276499B1 (en) | 2013-06-12 |
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