+データを開く
-基本情報
登録情報 | データベース: SASBDB / ID: SASDAG7 |
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試料 | CD44 HABD scFv MEM-85 complex
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生物種 | Homo sapiens (ヒト) Mus musculus (ハツカネズミ) |
引用 | ジャーナル: J Struct Biol / 年: 2015 タイトル: Molecular mechanism for the action of the anti-CD44 monoclonal antibody MEM-85. 著者: Jana Škerlová / Vlastimil Král / Michael Kachala / Milan Fábry / Ladislav Bumba / Dmitri I Svergun / Zdeněk Tošner / Václav Veverka / Pavlína Řezáčová / 要旨: The hyaluronate receptor CD44 plays role in cell adhesion and migration and is involved in tumor metastasis. The extracellular domain of CD44 comprises the hyaluronate-binding domain (HABD) and the ...The hyaluronate receptor CD44 plays role in cell adhesion and migration and is involved in tumor metastasis. The extracellular domain of CD44 comprises the hyaluronate-binding domain (HABD) and the membrane-proximal stem region; the short intracellular portion interacts with adaptor proteins and triggers signaling pathways. Binding of hyaluronate to CD44 HABD induces an allosteric conformational change, which results in CD44 shedding. A poorly characterized epitope in human CD44 HABD is recognized by the murine monoclonal antibody MEM-85, which cross-blocks hyaluronate binding to CD44 and also induces CD44 shedding. MEM-85 is of therapeutic interest, as it inhibits growth of lung cancer cells in murine models. In this work, we employed a combination of biophysical methods to determine the MEM-85 binding epitope in CD44 HABD and to provide detailed insight into the mechanism of MEM-85 action. In particular, we constructed a single-chain variable fragment (scFv) of MEM-85 as a tool for detailed characterization of the CD44 HABD-antibody complex and identified residues within CD44 HABD involved in the interaction with scFv MEM-85 by NMR spectroscopy and mutational analysis. In addition, we built a rigid body model of the CD44 HABD-scFv MEM-85 complex using a low-resolution structure obtained by small-angle X-ray scattering. The MEM-85 epitope is situated in the C-terminal part of CD44 HABD, rather than the hyaluronate-binding groove, and the binding of MEM-85 induces a structural reorganization similar to that induced by hyaluronate. Therefore, the mechanism of MEM-85 cross-blocking of hyaluronate binding is likely of an allosteric, relay-like nature. |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-モデル
モデル #279 | タイプ: dummy / ソフトウェア: DAMMIN / ダミー原子の半径: 2.50 A / 対称性: P1 / カイ2乗値: 2.460 Omokage検索でこの集合体の類似形状データを探す (詳細) |
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モデル #280 | タイプ: atomic / ソフトウェア: SASREF / ダミー原子の半径: 1.90 A / カイ2乗値: 1.24 Omokage検索でこの集合体の類似形状データを探す (詳細) |
-試料
試料 | 名称: CD44 HABD scFv MEM-85 complex / 試料濃度: 1.30-5.00 / Entity id: 158 / 159 |
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バッファ | 名称: PBS / PK: 7 / pH: 7.4 |
要素 #158 | 名称: CD44 HABD / タイプ: protein / 記述: Hyaluronate binding domain of CD44 antigen / 分子量: 17.9 / 分子数: 1 / 由来: Homo sapiens 配列: SNAASQIDLN ITCRFAGVFH VEKNGRYSIS RTEAADLCKA FNSTLPTMAQ MEKALSIGFE TCRYGFIEGH VVIPRIHPNS ICAANNTGVY ILTSNTSQYD TYCFNASAPP EEDCTSVTDL PNAFDGPITI TIVNRDGTRY VQKGEYRTNP EDIYPSNPTD DDV |
要素 #159 | 名称: scFv MEM-85 / タイプ: protein / 記述: Single-chain Variable Fragment of Antibody MEM-85 / 分子量: 28.5 / 分子数: 1 / 由来: Mus musculus 配列: EVQLQESGPG LVAPSQSLSI TCTVSGFSLT NYGVHWVRQP PGKGLEWLGV IWAGGSTNYN SALMSRLSIS KDNSKSQVFL KMNSLQTDDT AMYYCARDGA RAMDYWGQGT TVTVSGGGGS GGGGSGGGGS GGGGSDIVMS QSPSSLAVSV GEKVTVSCKS SQSLLYSSNQ ...配列: EVQLQESGPG LVAPSQSLSI TCTVSGFSLT NYGVHWVRQP PGKGLEWLGV IWAGGSTNYN SALMSRLSIS KDNSKSQVFL KMNSLQTDDT AMYYCARDGA RAMDYWGQGT TVTVSGGGGS GGGGSGGGGS GGGGSDIVMS QSPSSLAVSV GEKVTVSCKS SQSLLYSSNQ KNYLAWYQQK PGQSPKLLIS WASTRESGVP DRFTGSGSGT DFTLTISSVK AEDLAVYYCQ QSYSYPWTFG GGTKLEIKRE QKLISEEDLN GTHHHHH |
-実験情報
ビーム | 設備名称: PETRA III P12 / 地域: Hamburg / 国: Germany / 線源: X-ray synchrotron / 波長: 0.12 Å / スペクトロメータ・検出器間距離: 3.1 mm | |||||||||||||||||||||||||||||||||
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検出器 | 名称: Pilatus 2M | |||||||||||||||||||||||||||||||||
スキャン | タイトル: CD44 HABD scFv MEM-85 complex / 測定日: 2013年10月31日 / 保管温度: 10 °C / セル温度: 10 °C / 照射時間: 0.05 sec. / フレーム数: 20 / 単位: 1/nm /
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距離分布関数 P(R) | ソフトウェア P(R): GNOM 4.5a / ポイント数: 352 /
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結果 | カーブのタイプ: extrapolated / Standard: BSA /
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