ID   LHA2_RUBGE              Reviewed;          71 AA.
AC   P77799;
DT   16-AUG-2004, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1997, sequence version 1.
DT   03-AUG-2022, entry version 81.
DE   RecName: Full=Light-harvesting protein B-800/850 alpha chain;
DE   AltName: Full=Antenna pigment protein alpha chain;
DE   AltName: Full=LH2 alpha polypeptide;
GN   Name=pucA;
OS   Rubrivivax gelatinosus (Rhodocyclus gelatinosus) (Rhodopseudomonas
OS   gelatinosa).
OC   Bacteria; Proteobacteria; Betaproteobacteria; Burkholderiales; Rubrivivax.
OX   NCBI_TaxID=28068;
RN   [1]
RP   PROTEIN SEQUENCE, AND SUBUNIT STRUCTURE.
RC   STRAIN=DSM 149 / LMG 4308 / 2150, and DSM 151 / LMG 4306 / Dr 2;
RX   PubMed=8020505; DOI=10.1111/j.1432-1033.1994.tb18911.x;
RA   Brunisholz R.A., Suter F., Zuber H.;
RT   "Structural and spectral characterisation of the antenna complexes of
RT   Rhodocyclus gelatinosus. Indications of a hairpin-like-arranged antenna
RT   apoprotein with an unusually high alanine content.";
RL   Eur. J. Biochem. 222:667-675(1994).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=DSM 149 / LMG 4308 / 2150, and DSM 151 / LMG 4306 / Dr 2;
RA   Simmons A.E.;
RL   Submitted (AUG-1996) to the EMBL/GenBank/DDBJ databases.
RN   [3]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=DSM 151 / LMG 4306 / Dr 2;
RX   PubMed=16228472; DOI=10.1023/a:1006403901559;
RA   Simmons A.E., Barrett S.J., Hunter C.N., Cogdell R.J.;
RT   "Cloning, sequencing and analysis of the pucC gene from Rubrivivax
RT   gelatinosus strain 151 and Rhodopseudomonas acidophila strain 10050.";
RL   Photosyn. Res. 65:69-82(2000).
CC   -!- FUNCTION: Antenna complexes are light-harvesting systems, which
CC       transfer the excitation energy to the reaction centers.
CC   -!- SUBUNIT: An alpha/beta heterodimer conjugated to 3 bacteriochlorophyll
CC       molecules. The core complex is formed by different alpha and beta
CC       chains, binding bacteriochlorophyll molecules, and arranged most
CC       probably in tetrameric structures disposed around the reaction center.
CC       The non-pigmented gamma chains may constitute additional components (By
CC       similarity). {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cell membrane; Multi-pass membrane protein.
CC   -!- MISCELLANEOUS: An active antenna complex lacking the last 16 residues
CC       has also been isolated from DSM 149. {ECO:0000305|PubMed:8020505}.
CC   -!- SIMILARITY: Belongs to the antenna complex alpha subunit family.
CC       {ECO:0000305}.
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DR   EMBL; U67155; AAB49634.1; -; Genomic_DNA.
DR   EMBL; U67154; AAB49631.1; -; Genomic_DNA.
DR   EMBL; AJ245615; CAB52411.1; -; Genomic_DNA.
DR   PIR; S45608; S45608.
DR   AlphaFoldDB; P77799; -.
DR   SMR; P77799; -.
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: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; IPR035889; Light-harvesting_complex.
DR   Pfam; PF00556; LHC; 1.
DR   PRINTS; PR00673; LIGHTHARVSTA.
DR   SUPFAM; SSF56918; SSF56918; 1.
PE   1: Evidence at protein level;
KW   Antenna complex; Bacteriochlorophyll; Cell membrane; Chlorophyll;
KW   Chromophore; Direct protein sequencing; Light-harvesting polypeptide;
KW   Magnesium; Membrane; Metal-binding; Transmembrane; Transmembrane helix.
FT   CHAIN           1..71
FT                   /note="Light-harvesting protein B-800/850 alpha chain"
FT                   /id="PRO_0000099793"
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..50
FT                   /note="Periplasmic"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        51..71
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   BINDING         31
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   71 AA;  7135 MW;  9DAD3803E32C0FEF CRC64;
     MNQGKVWRVV KPTVGVPVYL GAVAVTALIL HGGLLAKTDW FGAYWNGGKK AAAAAAAVAP
     APVAAPQAPA Q