ID   LHA_CHLAA               Reviewed;          57 AA.
AC   P07503; A9WEY7;
DT   01-APR-1988, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1994, sequence version 2.
DT   03-AUG-2022, entry version 120.
DE   RecName: Full=Light-harvesting protein B-808/866 alpha chain;
DE   AltName: Full=Antenna pigment protein alpha chain;
DE   AltName: Full=Bacteriochlorophyll a-binding protein;
GN   Name=puf2A; OrderedLocusNames=Caur_2090;
OS   Chloroflexus aurantiacus (strain ATCC 29366 / DSM 635 / J-10-fl).
OC   Bacteria; Chloroflexi; Chloroflexia; Chloroflexales; Chloroflexineae;
OC   Chloroflexaceae; Chloroflexus.
OX   NCBI_TaxID=324602;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=7535995; DOI=10.1007/bf00381786;
RA   Watanabe Y., Feick R.G., Shiozawa J.A.;
RT   "Cloning and sequencing of the genes encoding the light-harvesting B806-866
RT   polypeptides and initial studies on the transcriptional organization of
RT   puf2B, puf2A and puf2C in Chloroflexus aurantiacus.";
RL   Arch. Microbiol. 163:124-130(1995).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 29366 / DSM 635 / J-10-fl;
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).
RN   [3]
RP   PROTEIN SEQUENCE OF 1-44, AND FORMYLATION AT MET-1.
RX   DOI=10.1016/0014-5793(85)80988-1;
RA   Wechsler T., Brunisholz R.A., Suter F., Fuller R.C., Zuber H.;
RT   "The complete amino acid sequence of a bacteriochlorophyll a binding
RT   polypeptide isolated from the cytoplasmic membrane of the green
RT   photosynthetic bacterium Chloroflexus aurantiacus.";
RL   FEBS Lett. 191:34-38(1985).
CC   -!- FUNCTION: Antenna complexes are light-harvesting systems, which
CC       transfer the excitation energy to the reaction centers.
CC   -!- SUBUNIT: The core complex is formed by different alpha and beta chains,
CC       binding bacteriochlorophyll molecules, and arranged most probably in
CC       tetrameric structures disposed around the reaction center. The non-
CC       pigmented gamma chains may constitute additional components.
CC   -!- SUBCELLULAR LOCATION: Cell membrane; Single-pass type II membrane
CC       protein.
CC   -!- SIMILARITY: Belongs to the antenna complex alpha subunit family.
CC       {ECO:0000305}.
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DR   EMBL; X73899; CAA52105.1; -; Genomic_DNA.
DR   EMBL; CP000909; ABY35302.1; -; Genomic_DNA.
DR   PIR; I40618; I40618.
DR   RefSeq; WP_012257956.1; NC_010175.1.
DR   RefSeq; YP_001635691.1; NC_010175.1.
DR   AlphaFoldDB; P07503; -.
DR   SMR; P07503; -.
DR   STRING; 324602.Caur_2090; -.
DR   PRIDE; P07503; -.
DR   EnsemblBacteria; ABY35302; ABY35302; Caur_2090.
DR   KEGG; cau:Caur_2090; -.
DR   PATRIC; fig|324602.8.peg.2370; -.
DR   HOGENOM; CLU_3005767_0_0_0; -.
DR   Proteomes; UP000002008; Chromosome.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0019866; C:organelle inner membrane; IEA:InterPro.
DR   GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0030077; C:plasma membrane light-harvesting complex; IEA:InterPro.
DR   GO; GO:0042314; F:bacteriochlorophyll binding; IEA:UniProtKB-KW.
DR   GO; GO:0045156; F:electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity; IEA:InterPro.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0019684; P:photosynthesis, light reaction; IEA:InterPro.
DR   Gene3D; 4.10.220.20; -; 1.
DR   InterPro; IPR000066; Antenna_a/b.
DR   InterPro; IPR002361; Antenna_alpha_CS.
DR   InterPro; IPR035889; Light-harvesting_complex.
DR   Pfam; PF00556; LHC; 1.
DR   SUPFAM; SSF56918; SSF56918; 1.
DR   PROSITE; PS00968; ANTENNA_COMP_ALPHA; 1.
PE   1: Evidence at protein level;
KW   Antenna complex; Bacteriochlorophyll; Cell membrane; Chlorophyll;
KW   Chromophore; Direct protein sequencing; Formylation;
KW   Light-harvesting polypeptide; Magnesium; Membrane; Metal-binding;
KW   Reference proteome; Transmembrane; Transmembrane helix.
FT   CHAIN           1..57
FT                   /note="Light-harvesting protein B-808/866 alpha chain"
FT                   /id="PRO_0000099777"
FT   TOPO_DOM        1..10
FT                   /note="Cytoplasmic"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        11..30
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        31..57
FT                   /note="Periplasmic"
FT                   /evidence="ECO:0000255"
FT   BINDING         26
FT                   /ligand="a bacteriochlorophyll"
FT                   /ligand_id="ChEBI:CHEBI:38201"
FT                   /ligand_part="Mg"
FT                   /ligand_part_id="ChEBI:CHEBI:25107"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255"
FT   MOD_RES         1
FT                   /note="N-formylmethionine"
FT                   /evidence="ECO:0000269|Ref.3"
SQ   SEQUENCE   57 AA;  6198 MW;  ACB159B2B2F9E854 CRC64;
     MQPRSPVRTN IVIFTILGFV VALLIHFIVL SSPEYNWLSN AEGGALLLSA ARALFGI