7Q63

The tandem SH2 domains of SYK

これはPDB形式変換不可エントリーです。

7Q63 の概要

• エントリーDOI: 10.2210/pdb7q63/pdb
• 分子名称: Tyrosine-protein kinase SYK, DI(HYDROXYETHYL)ETHER, THIOCYANATE ION, ... (6 entities in total)
• 機能のキーワード: signalling, kinase, transferase
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 90447.29

構造登録者

Bradshaw, W.J.,Katis, V.L.,Chen, Z.,Bountra, C.,von Delft, F.,Gileadi, O.,Brennan, P.E. (登録日: 2021-11-05, 公開日: 2021-11-24, 最終更新日: 2025-01-29)

主引用文献

Bradshaw, W.J.,Harris, G.,Gileadi, O.,Katis, V.L.
The mechanism of allosteric activation of SYK kinase derived from multiple phospho-ITAM-bound structures.
Structure, 32:2337-2351.e4, 2024

PubMed Abstract: Spleen tyrosine kinase (SYK) is central to adaptive and innate immune signaling. It features a regulatory region containing tandem SH2 (tSH2) domains separated by a helical "hinge" segment keeping SYK inactive by associating with the kinase domain. SYK activation is triggered when the tSH2 domains bind to a phosphorylated immunoreceptor tyrosine-based activation motif (ITAM) found on receptor tails. Past mutational studies have indicated that ITAM binding disrupts the hinge-kinase interaction, leading to SYK phosphorylation and activation. However, the mechanism of this process is unclear, as the ITAM interaction occurs far from the hinge region. We have determined crystal structures of three phospho-ITAMs in complex with the tSH2 domains, revealing a highly conserved binding mechanism. These structures, together with mutational studies and biophysical analyses, reveal that phospho-ITAM binding restricts SH2 domain movement and causes allosteric changes in the hinge region. These changes are not compatible with the association of the kinase domain, leading to kinase activation.

PubMed: 39442513
DOI: 10.1016/j.str.2024.09.024

実験手法

X-RAY DIFFRACTION (1.9 Å)