ID   MSRQ_BRUA2              Reviewed;         220 AA.
AC   Q2YIK1;
DT   05-FEB-2008, integrated into UniProtKB/Swiss-Prot.
DT   07-FEB-2006, sequence version 1.
DT   25-MAY-2022, entry version 79.
DE   RecName: Full=Protein-methionine-sulfoxide reductase heme-binding subunit MsrQ {ECO:0000255|HAMAP-Rule:MF_01207};
DE   AltName: Full=Flavocytochrome MsrQ {ECO:0000255|HAMAP-Rule:MF_01207};
GN   Name=msrQ {ECO:0000255|HAMAP-Rule:MF_01207}; OrderedLocusNames=BAB2_0242;
OS   Brucella abortus (strain 2308).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Hyphomicrobiales;
OC   Brucellaceae; Brucella/Ochrobactrum group; Brucella.
OX   NCBI_TaxID=359391;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=2308;
RX   PubMed=16299333; DOI=10.1128/iai.73.12.8353-8361.2005;
RA   Chain P.S., Comerci D.J., Tolmasky M.E., Larimer F.W., Malfatti S.A.,
RA   Vergez L.M., Aguero F., Land M.L., Ugalde R.A., Garcia E.;
RT   "Whole-genome analyses of speciation events in pathogenic Brucellae.";
RL   Infect. Immun. 73:8353-8361(2005).
CC   -!- FUNCTION: Part of the MsrPQ system that repairs oxidized periplasmic
CC       proteins containing methionine sulfoxide residues (Met-O), using
CC       respiratory chain electrons. Thus protects these proteins from
CC       oxidative-stress damage caused by reactive species of oxygen and
CC       chlorine generated by the host defense mechanisms. MsrPQ is essential
CC       for the maintenance of envelope integrity under bleach stress, rescuing
CC       a wide series of structurally unrelated periplasmic proteins from
CC       methionine oxidation. MsrQ provides electrons for reduction to the
CC       reductase catalytic subunit MsrP, using the quinone pool of the
CC       respiratory chain. {ECO:0000255|HAMAP-Rule:MF_01207}.
CC   -!- COFACTOR:
CC       Name=FMN; Xref=ChEBI:CHEBI:58210;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01207};
CC       Note=Binds 1 FMN per subunit. {ECO:0000255|HAMAP-Rule:MF_01207};
CC   -!- COFACTOR:
CC       Name=heme b; Xref=ChEBI:CHEBI:60344;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01207};
CC       Note=Binds 1 heme b (iron(II)-protoporphyrin IX) group per subunit.
CC       {ECO:0000255|HAMAP-Rule:MF_01207};
CC   -!- SUBUNIT: Heterodimer of a catalytic subunit (MsrP) and a heme-binding
CC       subunit (MsrQ). {ECO:0000255|HAMAP-Rule:MF_01207}.
CC   -!- SUBCELLULAR LOCATION: Cell inner membrane {ECO:0000255|HAMAP-
CC       Rule:MF_01207}; Multi-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01207}.
CC   -!- SIMILARITY: Belongs to the MsrQ family. {ECO:0000255|HAMAP-
CC       Rule:MF_01207}.
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DR   EMBL; AM040265; CAJ12408.1; -; Genomic_DNA.
DR   RefSeq; WP_002965660.1; NZ_KN046823.1.
DR   AlphaFoldDB; Q2YIK1; -.
DR   STRING; 359391.BAB2_0242; -.
DR   EnsemblBacteria; CAJ12408; CAJ12408; BAB2_0242.
DR   GeneID; 45126294; -.
DR   GeneID; 55592616; -.
DR   KEGG; bmf:BAB2_0242; -.
DR   PATRIC; fig|359391.11.peg.2192; -.
DR   HOGENOM; CLU_080662_2_0_5; -.
DR   OMA; LHFFWMR; -.
DR   PhylomeDB; Q2YIK1; -.
DR   Proteomes; UP000002719; Chromosome II.
DR   GO; GO:0005887; C:integral component of plasma membrane; IEA:UniProtKB-UniRule.
DR   GO; GO:0009055; F:electron transfer activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0010181; F:FMN binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0020037; F:heme binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0030091; P:protein repair; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_01207; MsrQ; 1.
DR   InterPro; IPR013130; Fe3_Rdtase_TM_dom.
DR   InterPro; IPR022837; MsrQ-like.
DR   PANTHER; PTHR36964; PTHR36964; 1.
DR   Pfam; PF01794; Ferric_reduct; 1.
PE   3: Inferred from homology;
KW   Cell inner membrane; Cell membrane; Electron transport; Flavoprotein; FMN;
KW   Heme; Iron; Membrane; Metal-binding; Reference proteome; Transmembrane;
KW   Transmembrane helix; Transport.
FT   CHAIN           1..220
FT                   /note="Protein-methionine-sulfoxide reductase heme-binding
FT                   subunit MsrQ"
FT                   /id="PRO_1000066168"
FT   TRANSMEM        20..40
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01207"
FT   TRANSMEM        52..72
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01207"
FT   TRANSMEM        86..106
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01207"
FT   TRANSMEM        122..142
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01207"
FT   TRANSMEM        153..173
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01207"
FT   TRANSMEM        175..195
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01207"
SQ   SEQUENCE   220 AA;  24797 MW;  AC2C060433169497 CRC64;
     MAAATGTRKK KTPRPGQWKL WLLYTAGFVP AVWTFYLGAT GQLGADPVKT FEHLLGLWAL
     RFLILTLLVT PIRDLTGITL LRYRRALGLL AFYYALMHFT TYMVLDQGLN LSAIITDIVR
     RPFITIGMIS LALLVPLALT SNNWSIRKLG RRWSSLHKLV YIAIAGSAVH FLMSVKSWPA
     EPVIYAAIVA ALLLWRLARP YLRTRKPALR PRGEAIALRK