ID   MSRAB_STRP6             Reviewed;         309 AA.
AC   Q5XAX5;
DT   30-AUG-2005, integrated into UniProtKB/Swiss-Prot.
DT   30-AUG-2005, sequence version 2.
DT   03-AUG-2022, entry version 97.
DE   RecName: Full=Peptide methionine sulfoxide reductase MsrA/MsrB;
DE   Includes:
DE     RecName: Full=Peptide methionine sulfoxide reductase MsrA;
DE              Short=Protein-methionine-S-oxide reductase;
DE              EC=1.8.4.11;
DE     AltName: Full=Peptide-methionine (S)-S-oxide reductase;
DE              Short=Peptide Met(O) reductase;
DE   Includes:
DE     RecName: Full=Peptide methionine sulfoxide reductase MsrB;
DE              EC=1.8.4.12;
DE     AltName: Full=Peptide-methionine (R)-S-oxide reductase;
GN   Name=msrAB; OrderedLocusNames=M6_Spy1303;
OS   Streptococcus pyogenes serotype M6 (strain ATCC BAA-946 / MGAS10394).
OC   Bacteria; Firmicutes; Bacilli; Lactobacillales; Streptococcaceae;
OC   Streptococcus.
OX   NCBI_TaxID=286636;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-946 / MGAS10394;
RX   PubMed=15272401; DOI=10.1086/422697;
RA   Banks D.J., Porcella S.F., Barbian K.D., Beres S.B., Philips L.E.,
RA   Voyich J.M., DeLeo F.R., Martin J.M., Somerville G.A., Musser J.M.;
RT   "Progress toward characterization of the group A Streptococcus metagenome:
RT   complete genome sequence of a macrolide-resistant serotype M6 strain.";
RL   J. Infect. Dis. 190:727-738(2004).
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       (By similarity). {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=[thioredoxin]-disulfide + H2O + L-methionyl-[protein] =
CC         [thioredoxin]-dithiol + L-methionyl-(S)-S-oxide-[protein];
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   -!- CATALYTIC ACTIVITY:
CC       Reaction=[thioredoxin]-disulfide + H2O + L-methionine = [thioredoxin]-
CC         dithiol + L-methionine (S)-S-oxide; 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   -!- CATALYTIC ACTIVITY:
CC       Reaction=[thioredoxin]-disulfide + H2O + L-methionyl-[protein] =
CC         [thioredoxin]-dithiol + L-methionyl-(R)-S-oxide-[protein];
CC         Xref=Rhea:RHEA:24164, Rhea:RHEA-COMP:10698, Rhea:RHEA-COMP:10700,
CC         Rhea:RHEA-COMP:12313, Rhea:RHEA-COMP:12314, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:16044, ChEBI:CHEBI:29950, ChEBI:CHEBI:45764,
CC         ChEBI:CHEBI:50058; EC=1.8.4.12;
CC   -!- SIMILARITY: In the N-terminal section; belongs to the MsrA Met
CC       sulfoxide reductase family. {ECO:0000305}.
CC   -!- SIMILARITY: In the C-terminal section; belongs to the MsrB Met
CC       sulfoxide reductase family. {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAT87438.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; CP000003; AAT87438.1; ALT_INIT; Genomic_DNA.
DR   AlphaFoldDB; Q5XAX5; -.
DR   SMR; Q5XAX5; -.
DR   EnsemblBacteria; AAT87438; AAT87438; M6_Spy1303.
DR   KEGG; spa:M6_Spy1303; -.
DR   HOGENOM; CLU_031040_1_1_9; -.
DR   Proteomes; UP000001167; Chromosome.
DR   GO; GO:0033744; F:L-methionine:thioredoxin-disulfide S-oxidoreductase activity; IEA:RHEA.
DR   GO; GO:0033743; F:peptide-methionine (R)-S-oxide reductase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0008113; F:peptide-methionine (S)-S-oxide reductase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0030091; P:protein repair; IEA:InterPro.
DR   GO; GO:0006979; P:response to oxidative stress; IEA:InterPro.
DR   Gene3D; 3.30.1060.10; -; 1.
DR   HAMAP; MF_01401; MsrA; 1.
DR   HAMAP; MF_01400; MsrB; 1.
DR   InterPro; IPR002569; Met_Sox_Rdtase_MsrA_dom.
DR   InterPro; IPR036509; Met_Sox_Rdtase_MsrA_sf.
DR   InterPro; IPR028427; Met_Sox_Rdtase_MsrB.
DR   InterPro; IPR002579; Met_Sox_Rdtase_MsrB_dom.
DR   InterPro; IPR011057; Mss4-like_sf.
DR   PANTHER; PTHR10173; PTHR10173; 1.
DR   Pfam; PF01625; PMSR; 1.
DR   Pfam; PF01641; SelR; 1.
DR   SUPFAM; SSF51316; SSF51316; 1.
DR   SUPFAM; SSF55068; SSF55068; 1.
DR   TIGRFAMs; TIGR00401; msrA; 1.
DR   TIGRFAMs; TIGR00357; TIGR00357; 1.
DR   PROSITE; PS51790; MSRB; 1.
PE   3: Inferred from homology;
KW   Multifunctional enzyme; Oxidoreductase.
FT   CHAIN           1..309
FT                   /note="Peptide methionine sulfoxide reductase MsrA/MsrB"
FT                   /id="PRO_0000138523"
FT   DOMAIN          170..293
FT                   /note="MsrB"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01126"
FT   REGION          1..153
FT                   /note="Peptide methionine sulfoxide reductase A"
FT   ACT_SITE        8
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        282
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01126"
SQ   SEQUENCE   309 AA;  35103 MW;  226E1374F1038ADF CRC64;
     MIYLAGGCFW GVEEYFSQVD GVLDAVSGYA NGRGDTTNYQ LIHQTGHAET VEVAYDANRI
     SLKELLLHFF RIIDPTSLNK QGNDRGSQYR TGIYYTDKAD LAIIDEVFKE KAKDYKKKIV
     VEKAPLKHFI KAEDYHQDYL KKNPNGYCHI DINQATYPVI DESKYPKPSA TEIKEKLSAD
     EYRVTQKNET EKAFSNRYWD SFDAGIYVDV VTGEPLFSSK DKFESGCGWP SFSRPISPDV
     VRYKEDKSFN MTRTEVRSRS GNSHLGHVFT DGPKDQGGLR YCINSLSITF IPKADMEAKG
     YGYLLSSVE