ID   PHCA_RHOVL              Reviewed;         162 AA.
AC   Q36699;
DT   15-JUL-1998, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1996, sequence version 1.
DT   03-AUG-2022, entry version 80.
DE   RecName: Full=C-phycocyanin alpha chain;
GN   Name=cpcA;
OS   Rhodella violacea (Red alga).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Rhodellophyceae; Rhodellales; Rhodellaceae;
OC   Rhodella.
OX   NCBI_TaxID=2801;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA   Garnier F., Richaud C., Bernard C.;
RT   "Cloning and sequence analysis of the genes encoding the a and b subunits
RT   of C-phycocyanin from the red alga Rhodella violacea.";
RL   (er) Plant Gene Register PGR95-101(1995).
CC   -!- FUNCTION: Light-harvesting photosynthetic bile pigment-protein from the
CC       phycobiliprotein complex (phycobilisome, PBS). Phycocyanin is the major
CC       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:P00306}.
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 one covalently linked phycocyanobilin chromophore.
CC       {ECO:0000250|UniProtKB:P00306}.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   EMBL; Z48165; CAA88178.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q36699; -.
DR   SMR; Q36699; -.
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; IPR006246; Phycocyanin_a.
DR   Pfam; PF00502; Phycobilisome; 1.
DR   PIRSF; PIRSF000081; Phycocyanin; 1.
DR   SUPFAM; SSF46458; SSF46458; 1.
DR   TIGRFAMs; TIGR01338; phycocy_alpha; 1.
PE   3: Inferred from homology;
KW   Antenna complex; Bile pigment; Chloroplast; Chromophore;
KW   Electron transport; Membrane; Photosynthesis; Phycobilisome; Plastid;
KW   Thylakoid; Transport.
FT   CHAIN           1..162
FT                   /note="C-phycocyanin alpha chain"
FT                   /id="PRO_0000199126"
FT   BINDING         84
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000250|UniProtKB:P00306"
SQ   SEQUENCE   162 AA;  17374 MW;  BFFB8033E352997C CRC64;
     MKTPITESIA SADSQGRFLT TTELQSVNGR YQRAAASLAA ARALTNNAQS LITSAAQAVY
     SKFPYTTQMP GPAYASSAVG KAKCARDIGY YLRMVTYCLV VGGTGPMDEY LVAGLEEINR
     SFDLSPSWYV EALSYIKGNH GLKGQSATEA NSYLDYAINV LS