ID   A9WBS2_CHLAA            Unreviewed;       181 AA.
AC   A9WBS2;
DT   05-FEB-2008, integrated into UniProtKB/TrEMBL.
DT   05-FEB-2008, sequence version 1.
DT   10-JUN-2026, entry version 101.
DE   RecName: Full=Peptide methionine sulfoxide reductase MsrA {ECO:0000256|HAMAP-Rule:MF_01401};
DE            Short=Protein-methionine-S-oxide reductase {ECO:0000256|HAMAP-Rule:MF_01401};
DE            EC=1.8.4.11 {ECO:0000256|HAMAP-Rule:MF_01401};
DE   AltName: Full=Peptide-methionine (S)-S-oxide reductase {ECO:0000256|HAMAP-Rule:MF_01401};
DE            Short=Peptide Met(O) reductase {ECO:0000256|HAMAP-Rule:MF_01401};
GN   Name=msrA {ECO:0000256|HAMAP-Rule:MF_01401};
GN   OrderedLocusNames=Caur_1661 {ECO:0000313|EMBL:ABY34879.1};
OS   Chloroflexus aurantiacus (strain ATCC 29366 / DSM 635 / J-10-fl).
OC   Bacteria; Bacillati; Chloroflexota; Chloroflexia; Chloroflexales;
OC   Chloroflexineae; Chloroflexaceae; Chloroflexus.
OX   NCBI_TaxID=324602 {ECO:0000313|EMBL:ABY34879.1, ECO:0000313|Proteomes:UP000002008};
RN   [1] {ECO:0000313|Proteomes:UP000002008}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 29366 / DSM 635 / J-10-fl
RC   {ECO:0000313|Proteomes:UP000002008};
RX   PubMed=21714912; DOI=10.1186/1471-2164-12-334;
RA   Tang K.H., Barry K., Chertkov O., Dalin E., Han C.S., Hauser L.J.,
RA   Honchak B.M., Karbach L.E., Land M.L., Lapidus A., Larimer F.W.,
RA   Mikhailova N., Pitluck S., Pierson B.K., Blankenship R.E.;
RT   "Complete genome sequence of the filamentous anoxygenic phototrophic
RT   bacterium Chloroflexus aurantiacus.";
RL   BMC Genomics 12:334-334(2011).
CC   -!- FUNCTION: Has an important function as a repair enzyme for proteins
CC       that have been inactivated by oxidation. Catalyzes the reversible
CC       oxidation-reduction of methionine sulfoxide in proteins to methionine.
CC       {ECO:0000256|HAMAP-Rule:MF_01401}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=L-methionyl-[protein] + [thioredoxin]-disulfide + H2O = L-
CC         methionyl-(S)-S-oxide-[protein] + [thioredoxin]-dithiol;
CC         Xref=Rhea:RHEA:14217, Rhea:RHEA-COMP:10698, Rhea:RHEA-COMP:10700,
CC         Rhea:RHEA-COMP:12313, Rhea:RHEA-COMP:12315, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:16044, ChEBI:CHEBI:29950, ChEBI:CHEBI:44120,
CC         ChEBI:CHEBI:50058; EC=1.8.4.11;
CC         Evidence={ECO:0000256|ARBA:ARBA00047806, ECO:0000256|HAMAP-
CC         Rule:MF_01401};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=[thioredoxin]-disulfide + L-methionine + H2O = L-methionine
CC         (S)-S-oxide + [thioredoxin]-dithiol; Xref=Rhea:RHEA:19993, Rhea:RHEA-
CC         COMP:10698, Rhea:RHEA-COMP:10700, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:29950, ChEBI:CHEBI:50058, ChEBI:CHEBI:57844,
CC         ChEBI:CHEBI:58772; EC=1.8.4.11;
CC         Evidence={ECO:0000256|ARBA:ARBA00048782, ECO:0000256|HAMAP-
CC         Rule:MF_01401};
CC   -!- SIMILARITY: Belongs to the MsrA Met sulfoxide reductase family.
CC       {ECO:0000256|ARBA:ARBA00005591, ECO:0000256|HAMAP-Rule:MF_01401}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; CP000909; ABY34879.1; -; Genomic_DNA.
DR   RefSeq; WP_012257533.1; NC_010175.1.
DR   AlphaFoldDB; A9WBS2; -.
DR   FunCoup; A9WBS2; 376.
DR   STRING; 324602.Caur_1661; -.
DR   EnsemblBacteria; ABY34879; ABY34879; Caur_1661.
DR   KEGG; cau:Caur_1661; -.
DR   PATRIC; fig|324602.8.peg.1900; -.
DR   eggNOG; COG0225; Bacteria.
DR   HOGENOM; CLU_031040_10_0_0; -.
DR   InParanoid; A9WBS2; -.
DR   Proteomes; UP000002008; Chromosome.
DR   GO; GO:0033744; F:L-methionine (S)-S-oxide reductase activity; IEA:RHEA.
DR   GO; GO:0008113; F:peptide-methionine (S)-S-oxide reductase activity; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.30.1060.10; Peptide methionine sulphoxide reductase MsrA; 1.
DR   HAMAP; MF_01401; MsrA; 1.
DR   InterPro; IPR002569; Met_Sox_Rdtase_MsrA_dom.
DR   InterPro; IPR036509; Met_Sox_Rdtase_MsrA_sf.
DR   NCBIfam; TIGR00401; msrA; 1.
DR   PANTHER; PTHR43774; PEPTIDE METHIONINE SULFOXIDE REDUCTASE; 1.
DR   PANTHER; PTHR43774:SF1; PEPTIDE METHIONINE SULFOXIDE REDUCTASE MSRA 2; 1.
DR   Pfam; PF01625; PMSR; 1.
DR   SUPFAM; SSF55068; Peptide methionine sulfoxide reductase; 1.
PE   3: Inferred from homology;
KW   Oxidoreductase {ECO:0000256|ARBA:ARBA00023002, ECO:0000256|HAMAP-
KW   Rule:MF_01401}; Reference proteome {ECO:0000313|Proteomes:UP000002008}.
FT   DOMAIN          4..172
FT                   /note="Peptide methionine sulphoxide reductase MsrA"
FT                   /evidence="ECO:0000259|Pfam:PF01625"
FT   ACT_SITE        12
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01401"
SQ   SEQUENCE   181 AA;  20642 MW;  43FEAA780842F7DE CRC64;
     MPLETATLAG GCFWCLEAVY DQVSGVKDVV SGYTGGYVPN PTYRRVCDGN TGHAEAVQIQ
     FDPEQISYRE LLEIFFSIHD PTTLNRQGAD VGTQYRSAIF YHSEEQRQVA EQLVRELTEQ
     QVFRDPIVTQ IVPATTFYPA EEYHQEYFAR NPYQPYCQFV VAPKVAKFQK LFAHRVAGEK
     S
//