3OHT

Crystal Structure of Salmo Salar p38alpha

3OHT の概要

• エントリーDOI: 10.2210/pdb3oht/pdb
• 分子名称: p38a, N-(2-CHLORO-6-METHYLPHENYL)-2-({6-[4-(2-HYDROXYETHYL)PIPERAZIN-1-YL]-2-METHYLPYRIMIDIN-4-YL}AMINO)-1,3-THIAZOLE-5-CARBOXAMIDE, SULFATE ION, ... (4 entities in total)
• 機能のキーワード: kinase serine/threonine-protein kinase transferase, transferase-transferase inhibitor complex, transferase/transferase inhibitor
• 由来する生物種: Salmo salar (Atlantic salmon)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 92060.12

構造登録者

Rothweiler, U.,Johnson, K.,Engh, R.A. (登録日: 2010-08-18, 公開日: 2011-06-29, 最終更新日: 2023-09-06)

主引用文献

Rothweiler, U.,Aberg, E.,Johnson, K.A.,Hansen, T.E.,Jorgensen, J.B.,Engh, R.A.
p38alpha MAP kinase dimers with swapped activation segments and a novel catalytic loop conformation
J.Mol.Biol., 411:474-485, 2011

PubMed Abstract: Many protein kinase functions, including autophosphorylation in trans, require dimerization, possibly by activation segment exchange. Such dimers have been reported for a few autophosphorylating protein kinases, but not for mitogen-activated protein kinases (MAPKs). Activation of MAPKs proceeds not only via the well-characterized action of dual T/Y specificity MAPK kinases, phosphorylating both residues of the MAPK TxY activation loop motif, but also via a noncanonical activation pathway triggered by phosphorylation at Tyr323 and homodimerization. Here, we report the 2. 7-Å-resolution structure of p38α MAPK from Salmo salar in a novel domain-swapped homodimeric form. The tyrosines of the conserved sequence YxAPE anchor the swapped activation segments in a configuration suitable for autophosphorylation in trans and provide a model for the noncanonical pathway. In the dimer, a structural unit containing Tyr323 is formed at a dimerization contact region that stabilizes the HRD catalytic loop in a unique inactive geometry. This feature is consistent with the requirement of Tyr323 phosphorylation for the initiation of the noncanonical pathway. Despite the interacting surface of more than 2600 Å(2), the dimer is not obligate, as gel filtration shows the dimerization to occur only at relatively high concentrations. The transition from monomer to dimer involves a relatively simple hinged displacement of helix EF and adjacent residues. Thus, dimer formation is likely to be transient, compatible with functional requirements for autophosphorylation, allowing further modulation, for example, by scaffolding mechanisms.

PubMed: 21699901
DOI: 10.1016/j.jmb.2011.06.013

実験手法

X-RAY DIFFRACTION (2.7 Å)