6Q9V | pdb_00006q9v

MSRB3

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Protein Modification Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d6q9va1	All beta proteins	Mss4-like	Mss4-like	automated matches	automated matches	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d6q9va2	Artifacts	Tags	Tags	Tags	N-terminal Tags	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d6q9vb1	All beta proteins	Mss4-like	Mss4-like	automated matches	automated matches	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Mss4-like	8100164	3001994	SCOP2B (2022-06-29)
B	SCOP2 Family	SelR domain	8100163	4002166	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	Mss4-like	8100164	3001994	SCOP2 (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	e6q9vA1	A: beta complex topology	X: ETN0001 domain-like (From Homology)	H: ETN0001 domain-like	T: Mss4-like	F: SelR	ECOD (1.6)
B	SelR	e6q9vB1	A: beta complex topology	X: ETN0001 domain-like (From Homology)	H: ETN0001 domain-like	T: Mss4-like	F: SelR	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	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
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	Methionine-R-sulfoxide reductase B3	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 L-methionine (R)-S-oxide reductase activity catalytic activity, acting on a protein 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 cytosol membrane-bounded organelle intracellular organelle mitochondrion organelle intracellular membrane-bounded organelle endoplasmic reticulum endomembrane system
B	Methionine-R-sulfoxide reductase B3	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 L-methionine (R)-S-oxide reductase activity catalytic activity, acting on a protein 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 cytosol membrane-bounded organelle intracellular organelle mitochondrion organelle intracellular membrane-bounded organelle endoplasmic reticulum endomembrane system

InterPro: Protein Family Classification InterPro Database Homepage

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

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: Q8IXL7	autosomal recessive nonsyndromic deafness 74 nonsyndromic genetic deafness hearing loss disorder osteosarcoma pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma spina bifida acute myeloid leukemia atypical teratoid rhabdoid tumor breast carcinoma exocrine pancreatic carcinoma large cell medulloblastoma malignant ependymoma non-small cell lung carcinoma ovarian cancer autosomal recessive nonsyndromic deafness 74 nonsyndromic genetic deafness hearing loss disorder osteosarcoma pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma spina bifida acute myeloid leukemia atypical teratoid rhabdoid tumor breast carcinoma exocrine pancreatic carcinoma large cell medulloblastoma malignant ependymoma non-small cell lung carcinoma ovarian cancer pancreatic intraductal papillary-mucinous neoplasm polycystic ovary syndrome tuberculosis adrenal cortex carcinoma cystic fibrosis lung adenocarcinoma malignant pancreatic neoplasm pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia psoriasis vascular disease atopic eczema breast cancer ductal breast carcinoma in situ invasive ductal breast carcinoma lung carcinoma medulloblastoma
B	Pharos: Q8IXL7	autosomal recessive nonsyndromic deafness 74 nonsyndromic genetic deafness hearing loss disorder osteosarcoma pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma spina bifida acute myeloid leukemia atypical teratoid rhabdoid tumor breast carcinoma exocrine pancreatic carcinoma large cell medulloblastoma malignant ependymoma non-small cell lung carcinoma ovarian cancer autosomal recessive nonsyndromic deafness 74 nonsyndromic genetic deafness hearing loss disorder osteosarcoma pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma spina bifida acute myeloid leukemia atypical teratoid rhabdoid tumor breast carcinoma exocrine pancreatic carcinoma large cell medulloblastoma malignant ependymoma non-small cell lung carcinoma ovarian cancer pancreatic intraductal papillary-mucinous neoplasm polycystic ovary syndrome tuberculosis adrenal cortex carcinoma cystic fibrosis lung adenocarcinoma malignant pancreatic neoplasm pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia psoriasis vascular disease atopic eczema breast cancer ductal breast carcinoma in situ invasive ductal breast carcinoma lung carcinoma medulloblastoma

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A	CSO	Parent Component: CYS RESID: AA0205 PSI-MOD : L-cysteine sulfenic acid MOD:00210
A	MLY	Parent Component: LYS RESID: AA0205 , AA0075 PSI-MOD : L-cysteine sulfenic acid MOD:00210 , N6,N6-dimethyl-L-lysine MOD:00084
B	CSO	Parent Component: CYS RESID: AA0205 , AA0075 , AA0205 PSI-MOD : L-cysteine sulfenic acid MOD:00210 , N6,N6-dimethyl-L-lysine MOD:00084 , L-cysteine sulfenic acid MOD:00210
B	MLY	Parent Component: LYS RESID: AA0205 , AA0075 , AA0205 , AA0075 PSI-MOD : L-cysteine sulfenic acid MOD:00210 , N6,N6-dimethyl-L-lysine MOD:00084 , L-cysteine sulfenic acid MOD:00210 , N6,N6-dimethyl-L-lysine MOD:00084

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.