2PE5

Crystal Structure of the Lac Repressor bound to ONPG in repressed state

2PE5 の概要

• エントリーDOI: 10.2210/pdb2pe5/pdb
• 関連するPDBエントリー: 2P9H 2PAF
• 分子名称: DNA (5'-D(*DAP*DAP*DTP*DTP*DGP*DTP*DGP*DAP*DGP*DCP*DGP*DCP*DTP*DCP*DAP*DCP*DAP*DAP*DTP*DT)-3'), Lactose operon repressor, 2-nitrophenyl beta-D-galactopyranoside (3 entities in total)
• 機能のキーワード: lac repressor, allosteric effectors, gene regulation, dna-binding, transcription, transcription regulation, transcription-dna complex, transcription/dna
• 由来する生物種: Escherichia coli; 詳細
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 125534.03

構造登録者

Daber, R.,Stayrook, S.E.,Rosenberg, A.,Lewis, M. (登録日: 2007-04-02, 公開日: 2008-03-18, 最終更新日: 2023-08-30)

主引用文献

Daber, R.,Stayrook, S.,Rosenberg, A.,Lewis, M.
Structural analysis of lac repressor bound to allosteric effectors
J.Mol.Biol., 370:609-619, 2007

PubMed Abstract: The lac operon is a model system for understanding how effector molecules regulate transcription and are necessary for allosteric transitions. The crystal structures of the lac repressor bound to inducer and anti-inducer molecules provide a model for how these small molecules can modulate repressor function. The structures of the apo repressor and the repressor bound to effector molecules are compared in atomic detail. All effectors examined here bind to the repressor in the same location and are anchored to the repressor through hydrogen bonds to several hydroxyl groups of the sugar ring. Inducer molecules form a more extensive hydrogen-bonding network compared to anti-inducers and neutral effector molecules. The structures of these effector molecules suggest that the O6 hydroxyl on the galactoside is essential for establishing a water-mediated hydrogen bonding network that bridges the N-terminal and C-terminal sub-domains. The altered hydrogen bonding can account in part for the different structural conformations of the repressor, and is vital for the allosteric transition.

PubMed: 17543986
DOI: 10.1016/j.jmb.2007.04.028

実験手法

X-RAY DIFFRACTION (3.5 Å)