ID   FIXS_RHIME              Reviewed;          55 AA.
AC   P18399;
DT   01-NOV-1990, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1990, sequence version 1.
DT   25-MAY-2022, entry version 101.
DE   RecName: Full=Nitrogen fixation protein FixS;
GN   Name=fixS; OrderedLocusNames=RA0658; ORFNames=SMa1208;
OS   Rhizobium meliloti (strain 1021) (Ensifer meliloti) (Sinorhizobium
OS   meliloti).
OG   Plasmid pSymA (megaplasmid 1).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Hyphomicrobiales;
OC   Rhizobiaceae; Sinorhizobium/Ensifer group; Sinorhizobium.
OX   NCBI_TaxID=266834;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=RCR2011 / SU47;
RX   PubMed=2536685; DOI=10.1128/jb.171.2.929-939.1989;
RA   Kahn D., David M., Domergue O., Daveran M.-L., Ghai J., Hirsch P.R.,
RA   Batut J.;
RT   "Rhizobium meliloti fixGHI sequence predicts involvement of a specific
RT   cation pump in symbiotic nitrogen fixation.";
RL   J. Bacteriol. 171:929-939(1989).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=1021;
RX   PubMed=11481432; DOI=10.1073/pnas.161294798;
RA   Barnett M.J., Fisher R.F., Jones T., Komp C., Abola A.P., Barloy-Hubler F.,
RA   Bowser L., Capela D., Galibert F., Gouzy J., Gurjal M., Hong A., Huizar L.,
RA   Hyman R.W., Kahn D., Kahn M.L., Kalman S., Keating D.H., Palm C.,
RA   Peck M.C., Surzycki R., Wells D.H., Yeh K.-C., Davis R.W., Federspiel N.A.,
RA   Long S.R.;
RT   "Nucleotide sequence and predicted functions of the entire Sinorhizobium
RT   meliloti pSymA megaplasmid.";
RL   Proc. Natl. Acad. Sci. U.S.A. 98:9883-9888(2001).
RN   [3]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=1021;
RX   PubMed=11474104; DOI=10.1126/science.1060966;
RA   Galibert F., Finan T.M., Long S.R., Puehler A., Abola P., Ampe F.,
RA   Barloy-Hubler F., Barnett M.J., Becker A., Boistard P., Bothe G.,
RA   Boutry M., Bowser L., Buhrmester J., Cadieu E., Capela D., Chain P.,
RA   Cowie A., Davis R.W., Dreano S., Federspiel N.A., Fisher R.F., Gloux S.,
RA   Godrie T., Goffeau A., Golding B., Gouzy J., Gurjal M., Hernandez-Lucas I.,
RA   Hong A., Huizar L., Hyman R.W., Jones T., Kahn D., Kahn M.L., Kalman S.,
RA   Keating D.H., Kiss E., Komp C., Lelaure V., Masuy D., Palm C., Peck M.C.,
RA   Pohl T.M., Portetelle D., Purnelle B., Ramsperger U., Surzycki R.,
RA   Thebault P., Vandenbol M., Vorhoelter F.J., Weidner S., Wells D.H.,
RA   Wong K., Yeh K.-C., Batut J.;
RT   "The composite genome of the legume symbiont Sinorhizobium meliloti.";
RL   Science 293:668-672(2001).
CC   -!- FUNCTION: The four proteins FixG, FixH, FixI, and FixS may participate
CC       in a membrane-bound complex coupling the FixI cation pump with a redox
CC       process catalyzed by FixG.
CC   -!- SUBCELLULAR LOCATION: Cell membrane.
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DR   EMBL; Z21854; CAA79908.1; -; Genomic_DNA.
DR   EMBL; AE006469; AAK65316.1; -; Genomic_DNA.
DR   PIR; B95344; B95344.
DR   PIR; D32052; D32052.
DR   RefSeq; NP_435904.1; NC_003037.1.
DR   RefSeq; WP_010967637.1; NC_003037.1.
DR   AlphaFoldDB; P18399; -.
DR   EnsemblBacteria; AAK65316; AAK65316; SMa1208.
DR   GeneID; 25012363; -.
DR   GeneID; 61599426; -.
DR   KEGG; sme:SMa1208; -.
DR   PATRIC; fig|266834.11.peg.678; -.
DR   HOGENOM; CLU_176840_4_1_5; -.
DR   OMA; MEVMVIL; -.
DR   PRO; PR:P18399; -.
DR   Proteomes; UP000001976; Plasmid pSymA.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0009399; P:nitrogen fixation; IEA:UniProtKB-KW.
DR   InterPro; IPR004714; Cyt_oxidase_maturation_cbb3.
DR   PANTHER; PTHR41532; PTHR41532; 1.
DR   Pfam; PF03597; FixS; 1.
DR   TIGRFAMs; TIGR00847; ccoS; 1.
PE   4: Predicted;
KW   Cell membrane; Membrane; Nitrogen fixation; Plasmid; Reference proteome;
KW   Transmembrane; Transmembrane helix.
FT   CHAIN           1..55
FT                   /note="Nitrogen fixation protein FixS"
FT                   /id="PRO_0000087261"
FT   TRANSMEM        4..24
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   55 AA;  5871 MW;  132350F4DD21D4C6 CRC64;
     MNTLIYLIPV ALSLGGLGLV AFLWALKSGQ YEDLDGASWR ILDDGDGEGE SSQTL