1DSB image
Entry Detail
PDB ID:
1DSB
Title:
CRYSTAL STRUCTURE OF THE DSBA PROTEIN REQUIRED FOR DISULPHIDE BOND FORMATION IN VIVO
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
1993-05-24
Release Date:
1994-01-31
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:DSBA
Chain IDs:A, B
Chain Length:189
Number of Molecules:2
Biological Source:Escherichia coli
Primary Citation
Crystal structure of the DsbA protein required for disulphide bond formation in vivo.
Nature 365 464 468 (1993)
PMID: 8413591 DOI: 10.1038/365464a0

Abstact

Proteins that contain disulphide bonds are often slow to fold in vitro because the oxidation and correct pairing of the cysteine residues is rate limiting. The folding of such proteins is greatly accelerated in Escherichia coli by DsbA, but the mechanism of this rate enhancement is not well understood. Here we report the crystal structure of oxidized DsbA and show that it resembles closely the ubiquitous redox protein thioredoxin, despite very low sequence similarity. An important difference, however, is the presence of another domain which forms a cap over the thioredoxin-like active site of DsbA. The redox-active disulphide bond, which is responsible for the oxidation of substrates, is thus at a domain interface and is surrounded by grooves and exposed hydrophobic side chains. These features suggest that DsbA might act by binding to partially folded polypeptide chains before oxidation of cysteine residues.

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