1WRS

NMR STUDY OF HOLO TRP REPRESSOR

1WRS の概要

• エントリーDOI: 10.2210/pdb1wrs/pdb
• 分子名称: HOLO TRP REPRESSOR, TRYPTOPHAN (2 entities in total)
• 機能のキーワード: operon repressor, transcription regulation, dna-binding, complex (operon repressor-peptide) complex, complex (operon repressor/peptide)
• 由来する生物種: Escherichia coli
• 細胞内の位置: Cytoplasm: P0A881
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 24487.90

構造登録者

Zhao, D.,Zheng, Z. (登録日: 1995-05-12, 公開日: 1996-06-20, 最終更新日: 2024-05-22)

主引用文献

Zhao, D.,Arrowsmith, C.H.,Jia, X.,Jardetzky, O.
Refined solution structures of the Escherichia coli trp holo- and aporepressor.
J.Mol.Biol., 229:735-746, 1993

PubMed Abstract: The solution structures of the trp-repressor from Escherichia coli in both the liganded (holo-) and unliganded (apo-) form, have been refined by restrained molecular dynamics with simulated annealing using the program XPLOR and additional experimental constraints. The ensemble of refined holorepressor structures have a root-mean-square deviation (r.m.s.d.) of 0.8 A relative to the average structure for the backbone of the dimer core (helices A, B, C, A', B', C') and 2.5 A for the helix-turn-helix DNA-binding domain (helices D and E). The corresponding values for the aporepressor are 0.9 A for the backbone of the ABC-dimer core and 3.2 A for the DE helix-turn-helix. The r.m.s.d. of the average structures from the corresponding crystal structures are 2.3 A for the holorepressor ABC core and 4.2 A for its DE region; 2.3 A for the aporepressor core and 5.5 A for its DE region. The relative disorder of the DNA-binding domain is reflected in a number of experimental parameters including substantially more rapid backbone proton exchange rates, exchange-limited relaxation times and crystallographic B-factors. The stabilizing effect of the L-Trp ligand is evident in these measurements, as it is in the higher precision of the holorepressor structure.

PubMed: 8433368
DOI: 10.1006/jmbi.1993.1076

実験手法

SOLUTION NMR