1HXD image
Deposition Date 2001-01-12
Release Date 2001-05-30
Last Version Date 2023-08-09
Entry Detail
PDB ID:
1HXD
Keywords:
Title:
CRYSTAL STRUCTURE OF E. COLI BIOTIN REPRESSOR WITH BOUND BIOTIN
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Work:
0.18
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:BIRA BIFUNCTIONAL PROTEIN
Gene (Uniprot):birA
Chain IDs:A, B
Chain Length:321
Number of Molecules:2
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation
Corepressor-induced organization and assembly of the biotin repressor: a model for allosteric activation of a transcriptional regulator.
Proc.Natl.Acad.Sci.USA 98 6045 6050 (2001)
PMID: 11353844 DOI: 10.1073/pnas.111128198

Abstact

The Escherichia coli biotin repressor binds to the biotin operator to repress transcription of the biotin biosynthetic operon. In this work, a structure determined by x-ray crystallography of a complex of the repressor bound to biotin, which also functions as an activator of DNA binding by the biotin repressor (BirA), is described. In contrast to the monomeric aporepressor, the complex is dimeric with an interface composed in part of an extended beta-sheet. Model building, coupled with biochemical data, suggests that this is the dimeric form of BirA that binds DNA. Segments of three surface loops that are disordered in the aporepressor structure are located in the interface region of the dimer and exhibit greater order than was observed in the aporepressor structure. The results suggest that the corepressor of BirA causes a disorder-to-order transition that is a prerequisite to repressor dimerization and DNA binding.

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Primary Citation of related structures