2O8A

rat PP1cgamma complexed with mouse inhibitor-2

2O8A の概要

• エントリーDOI: 10.2210/pdb2o8a/pdb
• 関連するPDBエントリー: 2O8G
• 分子名称: Serine/threonine-protein phosphatase PP1-gamma catalytic subunit, Protein phosphatase inhibitor 2 (3 entities in total)
• 機能のキーワード: protein phosphatase, inhibitor-2, hydrolase-inhibitor complex, hydrolase/inhibitor
• 由来する生物種: Rattus norvegicus (Norway rat); 詳細
• 細胞内の位置: Cytoplasm : P63088
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 122023.87

構造登録者

Hurley, T.D. (登録日: 2006-12-12, 公開日: 2007-07-17, 最終更新日: 2024-04-03)

主引用文献

Hurley, T.D.,Yang, J.,Zhang, L.,Goodwin, K.D.,Zou, Q.,Cortese, M.,Dunker, A.K.,Depaoli-Roach, A.A.
Structural basis for regulation of protein phosphatase 1 by inhibitor-2.
J.Biol.Chem., 282:28874-28883, 2007

PubMed Abstract: The functional specificity of type 1 protein phosphatases (PP1) depends on the associated regulatory/targeting and inhibitory subunits. To gain insights into the mechanism of PP1 regulation by inhibitor-2, an ancient and intrinsically disordered regulator, we solved the crystal structure of the complex to 2.5A resolution. Our studies show that, when complexed with PP1c, I-2 acquires three regions of order: site 1, residues 12-17, binds adjacent to a region recognized by many PP1 regulators; site 2, amino acids 44-56, interacts along the RVXF binding groove through an unsuspected sequence, KSQKW; and site 3, residues 130-169, forms alpha-helical regions that lie across the substrate-binding cleft. Specifically, residues 148-151 interact at the catalytic center, displacing essential metal ions, accounting for both rapid inhibition and slower inactivation of PP1c. Thus, our structure provides novel insights into the mechanism of PP1 inhibition and subsequent reactivation, has broad implications for the physiological regulation of PP1, and highlights common inhibitory interactions among phosphoprotein phosphatase family members.

PubMed: 17636256
DOI: 10.1074/jbc.M703472200

実験手法

X-RAY DIFFRACTION (2.61 Å)