ID   LHA_RHORU               Reviewed;          62 AA.
AC   P02947;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   01-AUG-1988, sequence version 1.
DT   03-AUG-2022, entry version 106.
DE   RecName: Full=Light-harvesting protein B-870 alpha chain;
DE   AltName: Full=Antenna pigment protein alpha chain;
DE   AltName: Full=LH-1;
DE   Flags: Precursor;
OS   Rhodospirillum rubrum.
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rhodospirillales;
OC   Rhodospirillaceae; Rhodospirillum.
OX   NCBI_TaxID=1085;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=3001063; DOI=10.1016/s0021-9258(17)42434-3;
RA   Berard J., Belanger G., Corriveau P., Gingras G.;
RT   "Molecular cloning and sequence of the B880 holochrome gene from
RT   Rhodospirillum rubrum.";
RL   J. Biol. Chem. 261:82-87(1986).
RN   [2]
RP   PROTEIN SEQUENCE OF 1-52, AND FORMYLATION AT MET-1.
RC   STRAIN=G-9+;
RX   DOI=10.1016/0014-5793(81)80778-8;
RA   Brunisholz R.A., Cuendet P.A., Theiler R., Zuber H.;
RT   "The complete amino acid sequence of the single light harvesting protein
RT   from chromatophores of Rhodospirillum rubrum G9(+).";
RL   FEBS Lett. 129:150-154(1981).
RN   [3]
RP   STRUCTURE BY NMR OF 1-52.
RX   PubMed=15740753; DOI=10.1016/j.jmb.2005.01.017;
RA   Wang Z.Y., Gokan K., Kobayashi M., Nozawa T.;
RT   "Solution structures of the core light-harvesting alpha and beta
RT   polypeptides from Rhodospirillum rubrum: implications for the pigment-
RT   protein and protein-protein interactions.";
RL   J. Mol. Biol. 347:465-477(2005).
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; M11801; AAA26462.1; -; Genomic_DNA.
DR   PIR; B24206; LBQFR.
DR   RefSeq; WP_011390724.1; NZ_NRSC01000108.1.
DR   PDB; 1XRD; NMR; -; A=1-52.
DR   PDB; 7EQD; EM; 2.76 A; 1/3/5/7/9/A/D/F/I/K/O/Q/S/U/W/Y=1-62.
DR   PDBsum; 1XRD; -.
DR   PDBsum; 7EQD; -.
DR   AlphaFoldDB; P02947; -.
DR   BMRB; P02947; -.
DR   SMR; P02947; -.
DR   OMA; NWLEGPR; -.
DR   EvolutionaryTrace; P02947; -.
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   Formylation; Light-harvesting polypeptide; Magnesium; Membrane;
KW   Metal-binding; Transmembrane; Transmembrane helix.
FT   CHAIN           1..52
FT                   /note="Light-harvesting protein B-870 alpha chain"
FT                   /id="PRO_0000001625"
FT   PROPEP          53..62
FT                   /id="PRO_0000001626"
FT   TOPO_DOM        1..12
FT                   /note="Cytoplasmic"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        13..33
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        34..52
FT                   /note="Periplasmic"
FT                   /evidence="ECO:0000255"
FT   BINDING         29
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:0000305|Ref.2"
FT   HELIX           3..7
FT                   /evidence="ECO:0007829|PDB:7EQD"
FT   HELIX           10..34
FT                   /evidence="ECO:0007829|PDB:7EQD"
FT   TURN            36..38
FT                   /evidence="ECO:0007829|PDB:7EQD"
FT   TURN            40..42
FT                   /evidence="ECO:0007829|PDB:7EQD"
FT   STRAND          44..48
FT                   /evidence="ECO:0007829|PDB:1XRD"
SQ   SEQUENCE   62 AA;  7107 MW;  66DB6F8513347090 CRC64;
     MWRIWQLFDP RQALVGLATF LFVLALLIHF ILLSTERFNW LEGASTKPVQ TSMVMPSSDL
     AV