5M04

Structure of ObgE from Escherichia coli

5M04 の概要

• エントリーDOI: 10.2210/pdb5m04/pdb
• 分子名称: GTPase ObgE/CgtA, GUANOSINE-5'-DIPHOSPHATE, MAGNESIUM ION, ... (4 entities in total)
• 機能のキーワード: gtpase, obge, cgta, hydrolase
• 由来する生物種: Escherichia coli DH5[alpha]
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 39666.18

構造登録者

Gkekas, S.,Singh, R.K.,Versees, W. (登録日: 2016-10-03, 公開日: 2017-03-01, 最終更新日: 2024-01-17)

主引用文献

Gkekas, S.,Singh, R.K.,Shkumatov, A.V.,Messens, J.,Fauvart, M.,Verstraeten, N.,Michiels, J.,Versees, W.
Structural and biochemical analysis of Escherichia coli ObgE, a central regulator of bacterial persistence.
J. Biol. Chem., 292:5871-5883, 2017

PubMed Abstract: The Obg protein family belongs to the TRAFAC (translation factor) class of P-loop GTPases and is conserved from bacteria to eukaryotes. Essential roles in many different cellular processes have been suggested for the Obg protein from (ObgE), and we recently showed that it is a central regulator of bacterial persistence. Here, we report the first crystal structure of ObgE at 1.85-Å resolution in the GDP-bound state, showing the characteristic N-terminal domain and a central G domain that are common to all Obg proteins. ObgE also contains an intrinsically disordered C-terminal domain, and we show here that this domain specifically contributed to GTP binding, whereas it did not influence GDP binding or GTP hydrolysis. Biophysical analysis, using small angle X-ray scattering and multi-angle light scattering experiments, revealed that ObgE is a monomer in solution, regardless of the bound nucleotide. In contrast to recent suggestions, our biochemical analyses further indicate that ObgE is neither activated by K ions nor by homodimerization. However, the ObgE GTPase activity was stimulated upon binding to the ribosome, confirming the ribosome-dependent GTPase activity of the Obg family. Combined, our data represent an important step toward further unraveling the detailed molecular mechanism of ObgE, which might pave the way to further studies into how this GTPase regulates bacterial physiology, including persistence.

PubMed: 28223358
DOI: 10.1074/jbc.M116.761809

実験手法

X-RAY DIFFRACTION (1.85 Å)