3Q4Z

Structure of unphosphorylated PAK1 kinase domain

3Q4Z の概要

• エントリーDOI: 10.2210/pdb3q4z/pdb
• 関連するPDBエントリー: 3Q52 3Q53
• 分子名称: Serine/threonine-protein kinase PAK 1, MAGNESIUM ION, PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER, ... (4 entities in total)
• 機能のキーワード: kinase domain, signalling pathway, transferase
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cytoplasm: Q13153
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 69559.88

構造登録者

Wang, J.,Wu, J.-W.,Wang, Z.-X. (登録日: 2010-12-26, 公開日: 2011-12-21, 最終更新日: 2023-11-01)

主引用文献

Wang, J.,Wu, J.-W.,Wang, Z.-X.
Structural insights into the autoactivation mechanism of p21-activated protein kinase
Structure, 19:1752-1761, 2011

PubMed Abstract: p21-activated kinases (PAKs) play an important role in diverse cellular processes. Full activation of PAKs requires autophosphorylation of a critical threonine/serine located in the activation loop of the kinase domain. Here we report crystal structures of the phosphorylated and unphosphorylated PAK1 kinase domain. The phosphorylated PAK1 kinase domain has a conformation typical of all active protein kinases. Interestingly, the structure of the unphosphorylated PAK1 kinase domain reveals an unusual dimeric arrangement expected in an authentic enzyme-substrate complex, in which the activation loop of the putative "substrate" is projected into the active site of the "enzyme." The enzyme is bound to AMP-PNP and has an active conformation, whereas the substrate is empty and adopts an inactive conformation. Thus, the structure of the asymmetric homodimer mimics a trans-autophosphorylation complex, and suggests that unphosphorylated PAK1 could dynamically adopt both the active and inactive conformations in solution.

PubMed: 22153498
DOI: 10.1016/j.str.2011.10.013

実験手法

X-RAY DIFFRACTION (1.887 Å)