ID   ATP6_SYNP6              Reviewed;         249 AA.
AC   P08444;
DT   01-AUG-1988, integrated into UniProtKB/Swiss-Prot.
DT   20-JAN-2009, sequence version 2.
DT   25-MAY-2022, entry version 142.
DE   RecName: Full=ATP synthase subunit a {ECO:0000255|HAMAP-Rule:MF_01393};
DE   AltName: Full=ATP synthase F0 sector subunit a {ECO:0000255|HAMAP-Rule:MF_01393};
DE   AltName: Full=F-ATPase subunit 6 {ECO:0000255|HAMAP-Rule:MF_01393};
GN   Name=atpB {ECO:0000255|HAMAP-Rule:MF_01393};
GN   Synonyms=atpI {ECO:0000255|HAMAP-Rule:MF_01393};
GN   OrderedLocusNames=syc1182_c;
OS   Synechococcus sp. (strain ATCC 27144 / PCC 6301 / SAUG 1402/1) (Anacystis
OS   nidulans).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus.
OX   NCBI_TaxID=269084;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=3041005; DOI=10.1016/0022-2836(87)90667-x;
RA   Cozens A.L., Walker J.E.;
RT   "The organization and sequence of the genes for ATP synthase subunits in
RT   the cyanobacterium Synechococcus 6301. Support for an endosymbiotic origin
RT   of chloroplasts.";
RL   J. Mol. Biol. 194:359-383(1987).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 27144 / PCC 6301 / SAUG 1402/1;
RX   PubMed=17211581; DOI=10.1007/s11120-006-9122-4;
RA   Sugita C., Ogata K., Shikata M., Jikuya H., Takano J., Furumichi M.,
RA   Kanehisa M., Omata T., Sugiura M., Sugita M.;
RT   "Complete nucleotide sequence of the freshwater unicellular cyanobacterium
RT   Synechococcus elongatus PCC 6301 chromosome: gene content and
RT   organization.";
RL   Photosyn. Res. 93:55-67(2007).
CC   -!- FUNCTION: Key component of the proton channel; it plays a direct role
CC       in the translocation of protons across the membrane.
CC       {ECO:0000255|HAMAP-Rule:MF_01393}.
CC   -!- SUBUNIT: F-type ATPases have 2 components, CF(1) - the catalytic core
CC       - and CF(0) - the membrane proton channel. CF(1) has five subunits:
CC       alpha(3), beta(3), gamma(1), delta(1), epsilon(1). CF(0) has four main
CC       subunits: a, b, b' and c. {ECO:0000255|HAMAP-Rule:MF_01393}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_01393}; Multi-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01393}.
CC   -!- SIMILARITY: Belongs to the ATPase A chain family. {ECO:0000255|HAMAP-
CC       Rule:MF_01393}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=BAD79372.1; Type=Erroneous initiation; Evidence={ECO:0000305};
CC       Sequence=CAA28923.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; X05302; CAA28923.1; ALT_INIT; Genomic_DNA.
DR   EMBL; AP008231; BAD79372.1; ALT_INIT; Genomic_DNA.
DR   PIR; S10826; PWYCA6.
DR   AlphaFoldDB; P08444; -.
DR   SMR; P08444; -.
DR   STRING; 269084.syc1182_c; -.
DR   EnsemblBacteria; BAD79372; BAD79372; syc1182_c.
DR   KEGG; syc:syc1182_c; -.
DR   eggNOG; COG0356; Bacteria.
DR   Proteomes; UP000001175; Chromosome.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0045263; C:proton-transporting ATP synthase complex, coupling factor F(o); IEA:UniProtKB-KW.
DR   GO; GO:0046933; F:proton-transporting ATP synthase activity, rotational mechanism; IEA:UniProtKB-UniRule.
DR   Gene3D; 1.20.120.220; -; 1.
DR   HAMAP; MF_01393; ATP_synth_a_bact; 1.
DR   InterPro; IPR045082; ATP_syn_F0_a_bact/chloroplast.
DR   InterPro; IPR000568; ATP_synth_F0_asu.
DR   InterPro; IPR023011; ATP_synth_F0_asu_AS.
DR   InterPro; IPR035908; F0_ATP_A_sf.
DR   PANTHER; PTHR42823; PTHR42823; 1.
DR   Pfam; PF00119; ATP-synt_A; 1.
DR   PRINTS; PR00123; ATPASEA.
DR   SUPFAM; SSF81336; SSF81336; 1.
DR   TIGRFAMs; TIGR01131; ATP_synt_6_or_A; 1.
DR   PROSITE; PS00449; ATPASE_A; 1.
PE   3: Inferred from homology;
KW   ATP synthesis; CF(0); Hydrogen ion transport; Ion transport; Membrane;
KW   Thylakoid; Transmembrane; Transmembrane helix; Transport.
FT   CHAIN           1..249
FT                   /note="ATP synthase subunit a"
FT                   /id="PRO_0000082075"
FT   TRANSMEM        33..53
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01393"
FT   TRANSMEM        92..112
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01393"
FT   TRANSMEM        131..151
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01393"
FT   TRANSMEM        196..216
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01393"
FT   TRANSMEM        217..237
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01393"
SQ   SEQUENCE   249 AA;  27791 MW;  701E2C86A8EF0965 CRC64;
     MPTLLELSSV LPLAELEVGQ HFYWQIGNYR LHGQVFLTSW FVIAALVVLS LLANRNLQRI
     PSGLQNFMEY VLDFIRNLAR TQIGEKEYRP WVPFIGTLFL FIFLSNWSGA LIPWKLIKLP
     SGELAAPTSD INTTVALALL TSLAYFYAGF SRKGLGYFGN YVHPTPVMLP FKILEDFTKP
     LSLSFRLFGN ILADELVVAV LVLLVPLFVP LPAMILGLFT SAIQALIFAT LAASYIGEAV
     EEHGEEHAE