LHA2_CERSP
ID LHA2_CERSP Reviewed; 54 AA.
AC P0C0Y0; P02946;
DT 21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT 24-JAN-2006, sequence version 1.
DT 03-AUG-2022, entry version 61.
DE RecName: Full=Light-harvesting protein B-800/850 alpha chain;
DE AltName: Full=Antenna pigment protein alpha chain;
DE AltName: Full=LH-2;
GN Name=pucA;
OS Cereibacter sphaeroides (Rhodobacter sphaeroides).
OC Bacteria; Proteobacteria; Alphaproteobacteria; Rhodobacterales;
OC Rhodobacteraceae; Cereibacter.
OX NCBI_TaxID=1063;
RN [1]
RP PROTEIN SEQUENCE.
RC STRAIN=R-26.1;
RX PubMed=6384009; DOI=10.1515/bchm2.1984.365.2.703;
RA Theiler R., Suter F., Wiemken V., Zuber H.;
RT "The light-harvesting polypeptides of Rhodopseudomonas sphaeroides R-26.1.
RT I. Isolation, purification and sequence analyses.";
RL Hoppe-Seyler's Z. Physiol. Chem. 365:703-719(1984).
RN [2]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA Ashby M.K., Coomber S.A., Hunter C.N.;
RT "Cloning, nucleotide sequence and transfer of genes for the B800-850 light
RT harvesting complex of Rhodobacter sphaeroides.";
RL FEBS Lett. 213:245-248(1987).
RN [3]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=2693605; DOI=10.1099/00221287-135-7-1809;
RA Burgess J.G., Ashby M.K., Hunter C.N.;
RT "Characterization and complementation of a mutant of Rhodobacter
RT sphaeroides with a chromosomal deletion in the light-harvesting (LH2)
RT genes.";
RL J. Gen. Microbiol. 135:1809-1816(1989).
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 -!- MISCELLANEOUS: This polypeptide (LH-2) and LH-3B constitute the B-
CC 800/850 complex of R.sphaeroides 2.4.1 and the spectrally altered B-850
CC complex isolated from the blue-green mutant R-26.1, which absorbs at
CC 860 nM.
CC -!- SIMILARITY: Belongs to the antenna complex alpha subunit family.
CC {ECO:0000305}.
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DR EMBL; X05200; CAA28833.1; -; Genomic_DNA.
DR EMBL; M28360; AAA26131.1; -; Genomic_DNA.
DR PIR; A03446; LBRF2S.
DR PIR; A27087; A27087.
DR RefSeq; WP_002720480.1; NZ_WTFI01000017.1.
DR AlphaFoldDB; P0C0Y0; -.
DR SMR; P0C0Y0; -.
DR GeneID; 57470634; -.
DR GeneID; 67447049; -.
DR OMA; SHTTWFP; -.
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..54
FT /note="Light-harvesting protein B-800/850 alpha chain"
FT /id="PRO_0000099803"
FT TOPO_DOM 1..14
FT /note="Cytoplasmic"
FT /evidence="ECO:0000255"
FT TRANSMEM 15..35
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TOPO_DOM 36..54
FT /note="Periplasmic"
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"
FT VARIANT 24
FT /note="V -> F (in strain: R-26.1)"
SQ SEQUENCE 54 AA; 5599 MW; 50495C5332E23220 CRC64;
MTNGKIWLVV KPTVGVPLFL SAAVIASVVI HAAVLTTTTW LPAYYQGSAA VAAE
