ID   LHA_MAGML               Reviewed;          57 AA.
AC   P97253;
DT   15-JUL-1998, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 3.
DT   03-AUG-2022, entry version 96.
DE   RecName: Full=Light-harvesting protein B-800/850 alpha chain;
DE   AltName: Full=Antenna pigment protein alpha chain;
GN   Name=A1; Synonyms=A2, A3;
OS   Magnetospirillum molischianum (Rhodospirillum molischianum).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Rhodospirillales;
OC   Rhodospirillaceae; Magnetospirillum.
OX   NCBI_TaxID=1083;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=DSM 119 / LMG 4353 / Pfennig 3660;
RX   PubMed=8695630; DOI=10.1016/0005-2728(96)00017-5;
RA   Germeroth L., Reilaender H., Michel H.;
RT   "Molecular cloning, DNA sequence and transcriptional analysis of the
RT   Rhodospirillum molischianum B800/850 light-harvesting genes.";
RL   Biochim. Biophys. Acta 1275:145-150(1996).
RN   [2]
RP   X-RAY CRYSTALLOGRAPHY (2.4 ANGSTROMS).
RC   STRAIN=DSM 119 / LMG 4353 / Pfennig 3660;
RX   PubMed=8736556; DOI=10.1016/s0969-2126(96)00063-9;
RA   Koepke J., Hu X., Muenke C., Schulten K., Michel H.;
RT   "The crystal structure of the light-harvesting complex II (B800-850) from
RT   Rhodospirillum molischianum.";
RL   Structure 4:581-597(1996).
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.
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}.
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DR   EMBL; S82431; AAB46770.1; -; Genomic_DNA.
DR   PIR; A49290; A49290.
DR   PDB; 1LGH; X-ray; 2.40 A; A/D/G/J=2-57.
DR   PDBsum; 1LGH; -.
DR   AlphaFoldDB; P97253; -.
DR   SMR; P97253; -.
DR   DIP; DIP-59511N; -.
DR   IntAct; P97253; 3.
DR   DrugBank; DB07646; UNDECYLAMINE-N,N-DIMETHYL-N-OXIDE.
DR   EvolutionaryTrace; P97253; -.
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; Light-harvesting polypeptide;
KW   Magnesium; Membrane; Metal-binding; Transmembrane; Transmembrane helix.
FT   INIT_MET        1
FT                   /note="Removed"
FT   CHAIN           2..57
FT                   /note="Light-harvesting protein B-800/850 alpha chain"
FT                   /id="PRO_0000099795"
FT   TOPO_DOM        2..18
FT                   /note="Cytoplasmic"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        19..39
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        40..57
FT                   /note="Periplasmic"
FT                   /evidence="ECO:0000255"
FT   BINDING         35
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   HELIX           5..9
FT                   /evidence="ECO:0007829|PDB:1LGH"
FT   HELIX           10..13
FT                   /evidence="ECO:0007829|PDB:1LGH"
FT   HELIX           16..40
FT                   /evidence="ECO:0007829|PDB:1LGH"
FT   HELIX           42..44
FT                   /evidence="ECO:0007829|PDB:1LGH"
FT   HELIX           46..56
FT                   /evidence="ECO:0007829|PDB:1LGH"
SQ   SEQUENCE   57 AA;  6071 MW;  F39464B98ABB82AA CRC64;
     MSNPKDDYKI WLVINPSTWL PVIWIVATVV AIAVHAAVLA APGFNWIALG AAKSAAK