2PUA

CRYSTAL STRUCTURE OF THE LACI FAMILY MEMBER, PURR, BOUND TO DNA: MINOR GROOVE BINDING BY ALPHA HELICES

2PUA の概要

• エントリーDOI: 10.2210/pdb2pua/pdb
• 分子名称: DNA (5'-D(*TP*AP*CP*GP*CP*AP*AP*AP*CP*GP*TP*TP*TP*GP*CP*GP*T )-3'), PURINE REPRESSOR, 6-METHYLPURINE, ... (4 entities in total)
• 機能のキーワード: complex (dna-binding protein-dna), dna-binding regulatory protein, 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: 2
• 化学式量合計: 43342.00

構造登録者

Schumacher, R.G.,Choi, K.Y.,Zalkin, H.,Brennan, M.A. (登録日: 1997-10-04, 公開日: 1998-05-06, 最終更新日: 2024-02-21)

主引用文献

Schumacher, M.A.,Choi, K.Y.,Zalkin, H.,Brennan, R.G.
Crystal structure of LacI member, PurR, bound to DNA: minor groove binding by alpha helices.
Science, 266:763-770, 1994

PubMed Abstract: The three-dimensional structure of a ternary complex of the purine repressor, PurR, bound to both its corepressor, hypoxanthine, and the 16-base pair purF operator site has been solved at 2.7 A resolution by x-ray crystallography. The bipartite structure of PurR consists of an amino-terminal DNA-binding domain and a larger carboxyl-terminal corepressor binding and dimerization domain that is similar to that of the bacterial periplasmic binding proteins. The DNA-binding domain contains a helix-turn-helix motif that makes base-specific contacts in the major groove of the DNA. Base contacts are also made by residues of symmetry-related alpha helices, the "hinge" helices, which bind deeply in the minor groove. Critical to hinge helix-minor groove binding is the intercalation of the side chains of Leu54 and its symmetry-related mate, Leu54', into the central CpG-base pair step. These residues thereby act as "leucine levers" to pry open the minor groove and kink the purF operator by 45 degrees.

PubMed: 7973627

実験手法

X-RAY DIFFRACTION (2.9 Å)