7E43 | pdb_00007e43

Structural insights into a bifunctional peptide methionine sulfoxide reductase MsrA/B fusion protein from Helicobacter pylori

External Resource: Annotation


Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
B [auth A]V-sete7e43A1 A: a/b three-layered sandwichesX: CNF1/YfiH-like putative cysteine hydrolasesH: BromodomainT: BromodomainF: V-setECOD (v294.1)
A [auth B]Pkinase, ABC1e7e43B1 A: a/b three-layered sandwichesX: CNF1/YfiH-like putative cysteine hydrolasesH: BromodomainT: BromodomainF: Pkinase, ABC1ECOD (v294.1)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A [auth B],
B [auth A]		PF01625Peptide methionine sulfoxide reductase (PMSR)Peptide methionine sulfoxide reductaseThis enzyme repairs damaged proteins. Methionine sulfoxide in proteins is reduced to methionine. Domain
A [auth B],
B [auth A]		PF01641SelR domain (SelR)SelR domainMethionine sulfoxide reduction is an important process, by which cells regulate biological processes and cope with oxidative stress. MsrA, a protein involved in the reduction of methionine sulfoxides in proteins, has been known for four decades and h ...Methionine sulfoxide reduction is an important process, by which cells regulate biological processes and cope with oxidative stress. MsrA, a protein involved in the reduction of methionine sulfoxides in proteins, has been known for four decades and has been extensively characterised with respect to structure and function. However, recent studies revealed that MsrA is only specific for methionine-S-sulfoxides. Because oxidised methionines occur in a mixture of R and S isomers in vivo, it was unclear how stereo-specific MsrA could be responsible for the reduction of all protein methionine sulfoxides. It appears that a second methionine sulfoxide reductase, SelR, evolved that is specific for methionine-R-sulfoxides, the activity that is different but complementary to that of MsrA. Thus, these proteins, working together, could reduce both stereoisomers of methionine sulfoxide. This domain is found both in SelR proteins and fused with the peptide methionine sulfoxide reductase enzymatic domain Pfam:PF01625. The domain has two conserved cysteines and histidines. The domain binds both selenium and zinc [2]. The final cysteine is found to be replaced by the rare amino acid selenocysteine in some members of the family [1]. This family has methionine-R-sulfoxide reductase activity [2].
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A [auth B],
B [auth A]		Peptide methionine sulfoxide reductase MsrA/MsrB

InterPro: Protein Family Classification InterPro Database Homepage

ChainsAccessionNameType
A [auth B],
B [auth A]		IPR028427Peptide methionine sulfoxide reductase MsrBFamily
A [auth B],
B [auth A]		IPR002569Peptide methionine sulphoxide reductase MsrA domainDomain
A [auth B],
B [auth A]		IPR036509Peptide methionine sulphoxide reductase MsrA superfamilyHomologous Superfamily
A [auth B],
B [auth A]		IPR011057Mss4-like superfamilyHomologous Superfamily
A [auth B],
B [auth A]		IPR002579Peptide methionine sulphoxide reductase MrsB domainDomain