Database accession: MF7000842
Name: Hydroperoxide resistance protein, OhrB (Bacillus subtilis)
PDB ID: 2bjo
Experimental method: X-ray (2.10 Å)
Assembly: Homodimer
Source organism: Bacillus subtilis
Primary publication of the structure:
Cooper DR, Surendranath Y, Devedjiev Y, Bielnicki J, Derewenda ZS
Structure of the Bacillus subtilis OhrB hydroperoxide-resistance protein in a fully oxidized state.
(2007) Acta Crystallogr. D Biol. Crystallogr. 63: 1269-73
PMID: 18084074
Abstract:
The crystal structure of the fully oxidized form of the Bacillus subtilis organic hydroperoxide-resistance (OhrB) protein is reported at 2.1 A resolution. The electron density reveals an intact catalytic disulfide bond (Cys55-Cys119) in each of the two molecules, which are intertwined into a canonical obligate dimer. However, the stereochemistry of the disulfides is unorthodox and strained, suggesting that they are sensitive to reducing agents. A deep solvent-accessible gorge reaching Cys55 may represent the access route for the reductant.
Annotations from the GeneOntology database. Only terms that fit at least two of the interacting proteins are shown.Molecular function: not assigned
Biological process:
response to oxidative stress response to oxidative stress
Cellular component: not assigned
Structural annotations of the participating protein chains.Entry contents: 2 distinct polypeptide molecules
Chains: A, B
Notes: All chains according to the most probable oligomerization state stored in PDBe were considered.
Number of unique protein segments: 1
Name: Organic hydroperoxide resistance protein OhrB
Source organism: Bacillus subtilis
Length: 136 residues
Sequence:Sequence according to the corresponding UniProt protein segmentMALFTAKVTARGGRAGHITSDDGVLDFDIVMPNAKKEGQTGTNPEQLFAAGYAACFGGALEHVAKEQNIEIDSEIEGQVSLMKDESDGGFKIGVTLVVNTKDLDREKAQELVNAAHEFCPYSKATRGNVDVKLELK
UniProtKB AC: P80242 (positions: 2-136)
Coverage: 99%
Name: Organic hydroperoxide resistance protein OhrB
Source organism: Bacillus subtilis
Length: 136 residues
Sequence:Sequence according to the corresponding UniProt protein segmentMALFTAKVTARGGRAGHITSDDGVLDFDIVMPNAKKEGQTGTNPEQLFAAGYAACFGGALEHVAKEQNIEIDSEIEGQVSLMKDESDGGFKIGVTLVVNTKDLDREKAQELVNAAHEFCPYSKATRGNVDVKLELK
UniProtKB AC: P80242 (positions: 2-136)
Coverage: 99%
Evidence demonstrating that the participating proteins are unstructured prior to the interaction and their folding is coupled to binding. Representative domain in related structures: OsmC-like protein
Evidence level: Direct evidence
Evidence coverage: The full structure participates in mutual synergistic folding.
Complex Evidence:
Ohr is a tightly folded homodimer with a large buried hydrophobic surface area. The two monomers are tightly wrapped around each other in a head-to-tail orientation. Dimerization is dominated by helix–helix packing interactions of two long helices at the center of the hydrophobic core of the dimeric enzyme. Also, each β-sheet is composed of six strands, three from one monomer and three from the other (beta sheet augmentation). The hydrophobic core, as well as the surrounding β-sheets, are generated by combining elements of both monomers, therefore, it is clear that the two polypeptide chains have to fold together to form active Ohr, and that each monomer would individually be unstable. The two active sites are also located at the dimer interface (PMID:12485986).
Chain A:
N/A
Chain B:
N/A
Surface and contacts features:
Structures from the PDB that contain the same number of proteins, and the proteins from the two structures show a sufficient degree of pairwise similarity, i.e. they belong to the same UniRef90 cluster (the full proteins exhibit at least 90% sequence identity) and convey roughly the same region to their respective interactions (the two regions from the two proteins share a minimum of 70% overlap). Download the CIF file (.cif)
Download this entry's XML file (.xml)
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