ID   LHA4_RHOAC              Reviewed;          53 AA.
AC   P26789;
DT   01-AUG-1992, integrated into UniProtKB/Swiss-Prot.
DT   01-AUG-1992, sequence version 1.
DT   03-AUG-2022, entry version 106.
DE   RecName: Full=Light-harvesting protein B-800/850 alpha chain;
DE   AltName: Full=Antenna pigment protein alpha chain;
OS   Rhodoblastus acidophilus (Rhodopseudomonas acidophila).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Hyphomicrobiales;
OC   Beijerinckiaceae; Rhodoblastus.
OX   NCBI_TaxID=1074;
RN   [1]
RP   PROTEIN SEQUENCE.
RC   STRAIN=DSM 141 / 7750 / LMG 4302;
RX   PubMed=3376519; DOI=10.1515/znc-1988-1-216;
RA   Bissig I., Brunisholz R.A., Suter F., Cogdell R.J., Zuber H.;
RT   "The complete amino acid sequences of the B800-850 antenna polypeptides
RT   from Rhodopseudomonas acidophila strain 7750.";
RL   Z. Naturforsch. C 43:77-83(1988).
RN   [2]
RP   PROTEIN SEQUENCE.
RC   STRAIN=DSM 141 / 7750 / LMG 4302;
RA   Brunisholz R.A., Bissig I., Niederer E., Suter F., Zuber H.;
RL   (In) Biggins J. (eds.);
RL   Progress in photosynthesis research, pp.II.1:13-16, Martinus Nijhoff, The
RL   Hague (1987).
RN   [3]
RP   X-RAY CRYSTALLOGRAPHY (2.5 ANGSTROMS) IN COMPLEX WITH BACTERIOCHLOROPHYLL
RP   AND CAROTENOID, AND SUBUNIT.
RX   PubMed=8740367; DOI=10.1016/s0969-2126(96)00050-0;
RA   Freer A., Prince S., Sauer K., Papiz M., Hawthornthwaite-Lawless A.,
RA   McDermott G., Cogdell R., Isaacs N.W.;
RT   "Pigment-pigment interactions and energy transfer in the antenna complex of
RT   the photosynthetic bacterium Rhodopseudomonas acidophila.";
RL   Structure 4:449-462(1996).
RN   [4]
RP   X-RAY CRYSTALLOGRAPHY (2.5 ANGSTROMS) IN COMPLEX WITH BACTERIOCHLOROPHYLL
RP   AND CAROTENOID, AND SUBUNIT.
RC   STRAIN=10050;
RX   PubMed=9159480; DOI=10.1006/jmbi.1997.0966;
RA   Prince S.M., Papiz M.Z., Freer A.A., McDermott G.,
RA   Hawthornthwaite-Lawless A.M., Cogdell R.J., Isaacs N.W.;
RT   "Apoprotein structure in the LH2 complex from Rhodopseudomonas acidophila
RT   strain 10050: modular assembly and protein pigment interactions.";
RL   J. Mol. Biol. 268:412-423(1997).
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 9 alpha and 9 beta chains that
CC       bind bacteriochlorophyll and carotenoid molecules, and is disposed
CC       around the reaction center. The non-pigmented gamma chains may
CC       constitute additional components (By similarity). {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cell inner membrane; Single-pass type II membrane
CC       protein.
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DR   PIR; S06365; S06365.
DR   PDB; 1KZU; X-ray; 2.50 A; A/D/G=1-53.
DR   PDB; 1NKZ; X-ray; 2.00 A; A/C/E=1-53.
DR   PDB; 2FKW; X-ray; 2.45 A; A/C/E/G/I/K/M/O/R=1-53.
DR   PDBsum; 1KZU; -.
DR   PDBsum; 1NKZ; -.
DR   PDBsum; 2FKW; -.
DR   AlphaFoldDB; P26789; -.
DR   SMR; P26789; -.
DR   DrugBank; DB04147; Dodecyldimethylamine N-oxide.
DR   DrugBank; DB02899; N-Carboxymethionine.
DR   DrugBank; DB04464; N-Formylmethionine.
DR   EvolutionaryTrace; P26789; -.
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   3D-structure; Antenna complex; Bacteriochlorophyll; Cell inner membrane;
KW   Cell membrane; Chlorophyll; Chromophore; Direct protein sequencing;
KW   Light-harvesting polypeptide; Magnesium; Membrane; Metal-binding;
KW   Transmembrane; Transmembrane helix.
FT   CHAIN           1..53
FT                   /note="Light-harvesting protein B-800/850 alpha chain"
FT                   /id="PRO_0000099787"
FT   TOPO_DOM        1..13
FT                   /note="Cytoplasmic"
FT   TRANSMEM        14..34
FT                   /note="Helical"
FT   TOPO_DOM        35..53
FT                   /note="Periplasmic"
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   HELIX           6..8
FT                   /evidence="ECO:0007829|PDB:1NKZ"
FT   HELIX           12..37
FT                   /evidence="ECO:0007829|PDB:1NKZ"
FT   HELIX           40..46
FT                   /evidence="ECO:0007829|PDB:1NKZ"
SQ   SEQUENCE   53 AA;  5654 MW;  210F7597804C2E7F CRC64;
     MNQGKIWTVV NPAIGIPALL GSVTVIAILV HLAILSHTTW FPAYWQGGVK KAA