4LHX

Crystal structure of nucleotide-free Rab8:Rabin8

4LHX の概要

• エントリーDOI: 10.2210/pdb4lhx/pdb
• 関連するPDBエントリー: 4LHV 4LHW 4LHY 4LHZ 4LI0
• 分子名称: Ras-related protein Rab-8A, Rab-3A-interacting protein, SULFATE ION (3 entities in total)
• 機能のキーワード: small gtpase, guanine nucleotide exchange factor, protein transport
• 由来する生物種: Homo sapiens (human); 詳細
• 細胞内の位置: Cell membrane; Lipid-anchor; Cytoplasmic side (Potential): P61006; Cytoplasm: Q96QF0
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 78735.77

構造登録者

Guo, Z.,Hou, X.M.,Goody, R.S.,Itzen, A. (登録日: 2013-07-01, 公開日: 2013-10-09, 最終更新日: 2023-09-20)

主引用文献

Guo, Z.,Hou, X.,Goody, R.S.,Itzen, A.
Intermediates in the Guanine Nucleotide Exchange Reaction of Rab8 Protein Catalyzed by Guanine Nucleotide Exchange Factors Rabin8 and GRAB.
J.Biol.Chem., 288:32466-32474, 2013

PubMed Abstract: Small G-proteins of the Ras superfamily control the temporal and spatial coordination of intracellular signaling networks by acting as molecular on/off switches. Guanine nucleotide exchange factors (GEFs) regulate the activation of these G-proteins through catalytic replacement of GDP by GTP. During nucleotide exchange, three distinct substrate·enzyme complexes occur: a ternary complex with GDP at the start of the reaction (G-protein·GEF·GDP), an intermediary nucleotide-free binary complex (G-protein·GEF), and a ternary GTP complex after productive G-protein activation (G-protein·GEF·GTP). Here, we show structural snapshots of the full nucleotide exchange reaction sequence together with the G-protein substrates and products using Rabin8/GRAB (GEF) and Rab8 (G-protein) as a model system. Together with a thorough enzymatic characterization, our data provide a detailed view into the mechanism of Rabin8/GRAB-mediated nucleotide exchange.

PubMed: 24072714
DOI: 10.1074/jbc.M113.498329

実験手法

X-RAY DIFFRACTION (3.05 Å)