ID   PHCA_SYNY1              Reviewed;         163 AA.
AC   P20776;
DT   01-FEB-1991, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   03-AUG-2022, entry version 80.
DE   RecName: Full=C-phycocyanin alpha subunit;
GN   Name=cpcA;
OS   Synechocystis sp. (strain PCC 6701).
OC   Bacteria; Cyanobacteria; Oscillatoriophycideae; Chroococcales;
OC   Chroococcaceae; Geminocystis; unclassified Geminocystis.
OX   NCBI_TaxID=1144;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=2106506; DOI=10.1128/jb.172.3.1289-1296.1990;
RA   Anderson L.K., Grossman A.R.;
RT   "Genes for phycocyanin subunits in Synechocystis sp. strain PCC 6701 and
RT   assembly mutant UV16.";
RL   J. Bacteriol. 172:1289-1296(1990).
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.
CC       {ECO:0000250|UniProtKB:P13530}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000250};
CC       Peripheral membrane protein {ECO:0000250}; Cytoplasmic side
CC       {ECO:0000250}. Note=Part of the phycobilisome rod. {ECO:0000250}.
CC   -!- PTM: Contains one covalently linked phycocyanobilin chromophore.
CC       {ECO:0000250|UniProtKB:P13530}.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   EMBL; M33820; AAA27282.1; -; Genomic_DNA.
DR   PIR; B35126; B35126.
DR   AlphaFoldDB; P20776; -.
DR   SMR; P20776; -.
DR   GO; GO:0030089; C:phycobilisome; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
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; Chromophore; Electron transport; Membrane;
KW   Photosynthesis; Phycobilisome; Thylakoid; Transport.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000250"
FT   CHAIN           2..163
FT                   /note="C-phycocyanin alpha subunit"
FT                   /id="PRO_0000199138"
FT   BINDING         85
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000250|UniProtKB:P13530"
SQ   SEQUENCE   163 AA;  17452 MW;  C06D21BD5AE0A3E9 CRC64;
     MSKTPLTEAV SAADSQGRFL SSTELQVAFG RFRQATSGLQ AAKSLTDNAQ RLIDGAANAF
     YSKFPYTTTT PGANFASTAQ GKAKCSRDIG YYLRMVTYCL VAGGTGPIDE YLIAGIDEIN
     RSFDLSPSWY VEALKYIKAN HGLSGDAASE ANSYIDYAIN ALS