1M27

Crystal structure of SAP/FynSH3/SLAM ternary complex

1M27 の概要

• エントリーDOI: 10.2210/pdb1m27/pdb
• 関連するPDBエントリー: 1D4T
• 分子名称: SH2 domain protein 1A, Signaling lymphocytic activation molecule, Proto-oncogene tyrosine-protein kinase FYN, ... (5 entities in total)
• 機能のキーワード: sh2-sh3 interaction, signaling protein, transferase
• 由来する生物種: Homo sapiens (human); 詳細
• 細胞内の位置: Cytoplasm (Probable): O60880; Cell membrane: P06241; Cell membrane; Single-pass type I membrane protein: Q13291
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 20110.52

構造登録者

Chan, B.,Griesbach, J.,Song, H.K.,Poy, F.,Terhorst, C.,Eck, M.J. (登録日: 2002-06-21, 公開日: 2003-05-06, 最終更新日: 2024-02-14)

主引用文献

Chan, B.,Lanyi, A.,Song, H.K.,Griesbach, J.,Simarro-Grande, M.,Poy, F.,Howie, D.,Sumegi, J.,Terhorst, C.,Eck, M.J.
SAP couples Fyn to SLAM immune receptors.
NAT.CELL BIOL., 5:155-160, 2003

PubMed Abstract: SAP (SLAM-associated protein) is a small lymphocyte-specific signalling molecule that is defective or absent in patients with X-linked lymphoproliferative syndrome (XLP). Consistent with its single src homology 2 (SH2) domain architecture and unusually high affinity for SLAM (also called CD150), SAP has been suggested to function by blocking binding of SHP-2 or other SH2-containing signalling proteins to SLAM receptors. Additionally, SAP has recently been shown to be required for recruitment and activation of the Src-family kinase FynT after SLAM ligation. This signalling 'adaptor' function has been difficult to conceptualize, because unlike typical SH2-adaptor proteins, SAP contains only a single SH2 domain and lacks other recognized protein interaction domains or motifs. Here, we show that the SAP SH2 domain binds to the SH3 domain of FynT and directly couples FynT to SLAM. The crystal structure of a ternary SLAM-SAP-Fyn-SH3 complex reveals that SAP binds the FynT SH3 domain through a surface-surface interaction that does not involve canonical SH3 or SH2 binding interactions. The observed mode of binding to the Fyn-SH3 domain is expected to preclude the auto-inhibited conformation of Fyn, thereby promoting activation of the kinase after recruitment. These findings broaden our understanding of the functional repertoire of SH3 and SH2 domains.

PubMed: 12545174
DOI: 10.1038/ncb920

実験手法

X-RAY DIFFRACTION (2.5 Å)