1SU9

Reduced structure of the soluble domain of ResA

Summary for 1SU9

• Entry DOI: 10.2210/pdb1su9/pdb
• Related: 1ST9
• Descriptor: Thiol-disulfide oxidoreductase resA (2 entities in total)
• Functional Keywords: thioredoxin-like domain, alpha-beta protein, soluble domain, membrane protein, oxidoreductase
• Biological source: Bacillus subtilis
• Cellular location: Cell membrane; Single-pass type II membrane protein: P35160
• Total number of polymer chains: 2
• Total formula weight: 31884.26

Authors

Crow, A.,Acheson, R.M.,Le Brun, N.E.,Oubrie, A. (deposition date: 2004-03-26, release date: 2004-05-11, Last modification date: 2023-08-23)

Primary citation

Crow, A.,Acheson, R.M.,Le Brun, N.E.,Oubrie, A.
Structural Basis of Redox-coupled Protein Substrate Selection by the Cytochrome c Biosynthesis Protein ResA.
J.Biol.Chem., 279:23654-23660, 2004

PubMed Abstract: Post-translational maturation of cytochromes c involves the covalent attachment of heme to the Cys-Xxx-Xxx-Cys-His motif of the apo-cytochrome. For this process, the two cysteines of the motif must be in the reduced state. In bacteria, this is achieved by dedicated, membrane-bound thiol-disulfide oxidoreductases with a high reducing power, which are essential components of cytochrome c maturation systems and are also linked to cellular disulfide-bond formation machineries. Here we report high-resolution structures of oxidized and reduced states of a soluble, functional domain of one such oxidoreductase, ResA, from Bacillus subtilis. The structures elucidate the structural basis of the protein's high reducing power and reveal the largest redox-coupled conformational changes observed to date in any thioredoxin-like protein. These redox-coupled changes alter the protein surface and illustrate how the redox state of ResA predetermines to which substrate it binds. Furthermore, a polar cavity, present only in the reduced state, may confer specificity to recognize apo-cytochrome c. The described features of ResA are likely to be general for bacterial cytochrome c maturation systems.

PubMed: 15047692
DOI: 10.1074/jbc.M402823200

Experimental method

X-RAY DIFFRACTION (1.95 Å)