ID   LHA1_RHOCA              Reviewed;          58 AA.
AC   P02948;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   21-JUL-1986, sequence version 1.
DT   03-AUG-2022, entry version 101.
DE   RecName: Full=Light-harvesting protein B-870 alpha chain;
DE   AltName: Full=Antenna pigment protein alpha chain;
DE   AltName: Full=LH-1;
GN   Name=pufA;
OS   Rhodobacter capsulatus (Rhodopseudomonas capsulata).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rhodobacterales;
OC   Rhodobacteraceae; Rhodobacter.
OX   NCBI_TaxID=1061;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=16593406; DOI=10.1073/pnas.81.1.189;
RA   Youvan D.C., Alberti M., Begusch H., Bylina E.J., Hearst J.E.;
RT   "Reaction center and light-harvesting I genes from Rhodopseudomonas
RT   capsulata.";
RL   Proc. Natl. Acad. Sci. U.S.A. 81:189-192(1984).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=6744416; DOI=10.1016/0092-8674(84)90429-x;
RA   Youvan D.C., Bylina E.J., Alberti M., Begusch H., Hearst J.E.;
RT   "Nucleotide and deduced polypeptide sequences of the photosynthetic
RT   reaction-center, B870 antenna, and flanking polypeptides from R.
RT   capsulata.";
RL   Cell 37:949-957(1984).
RN   [3]
RP   PROTEIN SEQUENCE.
RA   Tadros M.H., Frank G., Zuber H., Drews G.;
RT   "The complete amino acid sequence of the large bacteriochlorophyll-binding
RT   polypeptide B870-alpha from the light-harvesting complex B870 of
RT   Rhodopseudomonas capsulata.";
RL   FEBS Lett. 190:41-44(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 inner membrane; Single-pass type II membrane
CC       protein.
CC   -!- SIMILARITY: Belongs to the antenna complex alpha subunit family.
CC       {ECO:0000305}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; K01184; AAA26173.1; -; Genomic_DNA.
DR   EMBL; Z11165; CAA77553.1; -; Genomic_DNA.
DR   PIR; A03449; LBRFAC.
DR   RefSeq; WP_013066436.1; NZ_VIBE01000010.1.
DR   AlphaFoldDB; P02948; -.
DR   SMR; P02948; -.
DR   GeneID; 31489638; -.
DR   OMA; NWLEGPR; -.
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; IPR018332; Antenna_alpha.
DR   InterPro; IPR002361; Antenna_alpha_CS.
DR   InterPro; IPR035889; Light-harvesting_complex.
DR   Pfam; PF00556; LHC; 1.
DR   PRINTS; PR00673; LIGHTHARVSTA.
DR   SUPFAM; SSF56918; SSF56918; 1.
DR   PROSITE; PS00968; ANTENNA_COMP_ALPHA; 1.
PE   1: Evidence at protein level;
KW   Antenna complex; Bacteriochlorophyll; Cell inner membrane; Cell membrane;
KW   Chlorophyll; Chromophore; Direct protein sequencing;
KW   Light-harvesting polypeptide; Magnesium; Membrane; Metal-binding;
KW   Transmembrane; Transmembrane helix.
FT   CHAIN           1..58
FT                   /note="Light-harvesting protein B-870 alpha chain"
FT                   /id="PRO_0000099790"
FT   TOPO_DOM        1..15
FT                   /note="Cytoplasmic"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        16..36
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        37..58
FT                   /note="Periplasmic"
FT                   /evidence="ECO:0000255"
FT   BINDING         32
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"
SQ   SEQUENCE   58 AA;  6594 MW;  53178828AA93C93D CRC64;
     MSKFYKIWLV FDPRRVFVAQ GVFLFLLAVL IHLILLSTPA FNWLTVATAK HGYVAAAQ