3CXK

1.7 A Crystal structure of methionine-R-sulfoxide reductase from Burkholderia pseudomallei: crystallization in a microfluidic crystal card.

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Mss4-like	8077641	3001994	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Mss4-like	8077641	3001994	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	SelR	e3cxkA1	A: beta complex topology	X: ETN0001 domain-like (From Homology)	H: ETN0001 domain-like	T: Mss4-like	F: SelR	ECOD (1.6)
B	SelR	e3cxkB1	A: beta complex topology	X: ETN0001 domain-like (From Homology)	H: ETN0001 domain-like	T: Mss4-like	F: SelR	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.170.150.20	Mainly Beta	Beta Complex	Metal Binding Protein, Guanine Nucleotide Exchange Factor	Chain A	CATH (4.3.0)
B	2.170.150.20	Mainly Beta	Beta Complex	Metal Binding Protein, Guanine Nucleotide Exchange Factor	Chain A	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01641	SelR domain (SelR)	SelR domain	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 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

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Methionine-R-sulfoxide reductase	oxidoreductase activity, acting on a sulfur group of donors oxidoreductase activity oxidoreductase activity, acting on a sulfur group of donors, disulfide as acceptor catalytic activity peptide-methionine (R)-S-oxide reductase activity cation binding transition metal ion binding zinc ion binding ion binding binding metal ion binding small molecule binding	response to oxidative stress response to stimulus response to stress protein repair metabolic process cellular process primary metabolic process protein metabolic process macromolecule metabolic process	cellular anatomical structure intracellular anatomical structure cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR028427	Peptide methionine sulfoxide reductase MsrB	Family
A, B	IPR011057	Mss4-like superfamily	Homologous Superfamily
A, B	IPR002579	Peptide methionine sulphoxide reductase MrsB domain	Domain

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.