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PHCB_CYACA
ID   PHCB_CYACA              Reviewed;         172 AA.
AC   O19909;
DT   29-AUG-2001, integrated into UniProtKB/Swiss-Prot.
DT   01-JAN-1998, sequence version 1.
DT   03-AUG-2022, entry version 87.
DE   RecName: Full=C-phycocyanin beta chain;
GN   Name=cpcB;
OS   Cyanidium caldarium (Red alga).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Bangiophyceae; Cyanidiales; Cyanidiaceae; Cyanidium.
OX   NCBI_TaxID=2771;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=RK-1;
RX   PubMed=11040290; DOI=10.1007/s002390010101;
RA   Gloeckner G., Rosenthal A., Valentin K.-U.;
RT   "The structure and gene repertoire of an ancient red algal plastid
RT   genome.";
RL   J. Mol. Evol. 51:382-390(2000).
CC   -!- FUNCTION: Light-harvesting photosynthetic tetrapyrrole chromophore-
CC       protein from the phycobiliprotein complex (phycobilisome, PBS).
CC       Phycocyanin is the major phycobiliprotein in the PBS rod.
CC   -!- SUBUNIT: Heterodimer of an alpha and a beta subunit, which further
CC       assembles into trimers and the trimers into hexamers. The basic
CC       functional unit of phycobiliproteins is a ring-shaped hexamer formed
CC       from two back-to-back trimers contacting via the alpha chain subunits.
CC       The trimers are composed of alpha/beta subunit heterodimers arranged
CC       around a three-fold axis of symmetry. The phycoerythrins also contain a
CC       gamma subunit which is located in the center of the hexamer.
CC       {ECO:0000250|UniProtKB:P00311}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000250}; Peripheral membrane protein {ECO:0000250}; Stromal side
CC       {ECO:0000250}. Note=Part of the phycobilisome rod. {ECO:0000250}.
CC   -!- PTM: Contains two covalently linked phycocyanobilin chromophores.
CC       {ECO:0000250|UniProtKB:P00311}.
CC   -!- MISCELLANEOUS: The light-harvesting antenna system in red algae and
CC       cyanobacteria is formed of phycobilisomes. These are composed of the
CC       phycobiliproteins phycoerythrin (CPE), phycocyanin (CPC) and
CC       allophycocyanin (APC). Cyanobacteria also contain phycoerythrocyanin
CC       (PCC). The phycobiliproteins all share the same subunit composition and
CC       organization with variations in the covalently bound open-chain
CC       tetrapyrrole chromophores. The phycobiliprotein complexes are arranged
CC       sequentially in antenna complexes linked by linker proteins with CPE at
CC       the periphery, CPC in the middle and APC at the core feeding to the
CC       photosynthetic reaction center.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   EMBL; AF022186; AAB82680.1; -; Genomic_DNA.
DR   PIR; T11977; T11977.
DR   RefSeq; NP_045081.1; NC_001840.1.
DR   PDB; 6Y3D; X-ray; 1.80 A; BBB/DDD/FFF/HHH/JJJ/LLL=1-172.
DR   PDBsum; 6Y3D; -.
DR   AlphaFoldDB; O19909; -.
DR   SMR; O19909; -.
DR   GeneID; 800251; -.
DR   GO; GO:0009535; C:chloroplast thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0030089; C:phycobilisome; IEA:UniProtKB-KW.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-KW.
DR   Gene3D; 1.10.490.20; -; 1.
DR   InterPro; IPR009050; Globin-like_sf.
DR   InterPro; IPR012128; Phycobilisome_asu/bsu.
DR   InterPro; IPR038719; Phycobilisome_asu/bsu_sf.
DR   InterPro; IPR006247; Phycocyanin_b.
DR   Pfam; PF00502; Phycobilisome; 1.
DR   PIRSF; PIRSF000081; Phycocyanin; 1.
DR   SUPFAM; SSF46458; SSF46458; 1.
DR   TIGRFAMs; TIGR01339; phycocy_beta; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Antenna complex; Bile pigment; Chloroplast; Chromophore;
KW   Electron transport; Membrane; Methylation; Photosynthesis; Phycobilisome;
KW   Plastid; Thylakoid; Transport.
FT   CHAIN           1..172
FT                   /note="C-phycocyanin beta chain"
FT                   /id="PRO_0000199148"
FT   BINDING         35
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000250"
FT   BINDING         39
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000250"
FT   BINDING         72
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000250"
FT   BINDING         77
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000250"
FT   BINDING         82..88
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000250"
FT   BINDING         82
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /ligand_label="2"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000250|UniProtKB:P00311"
FT   BINDING         149..151
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000250"
FT   BINDING         153
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /ligand_label="1"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000250|UniProtKB:P00311"
FT   MOD_RES         72
FT                   /note="N4-methylasparagine"
FT                   /evidence="ECO:0000250|UniProtKB:P00311"
SQ   SEQUENCE   172 AA;  18174 MW;  72622C72CFB841CD CRC64;
     MLDAFSKVVA QADARGEFLS NTQLDALSKM VADGNKRLDA TAAISANAAT IVTNAARSLF
     SEQPQLIQPG GNAYTNRRMA ACLRDMEIIL RYVSYATIAG DSSVLDDRCL NGLRETYQAL
     GVPGASVALA VEKMKEAAIA FANDSSNVTI GDCSALISEI ATYFDRAAKA VV
 
 
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