ID   PHCA_APHFL              Reviewed;         108 AA.
AC   P85868;
DT   05-MAY-2009, integrated into UniProtKB/Swiss-Prot.
DT   05-MAY-2009, sequence version 1.
DT   03-AUG-2022, entry version 26.
DE   RecName: Full=C-phycocyanin alpha subunit {ECO:0000250|UniProtKB:P00307};
DE   Flags: Fragments;
GN   Name=cpcA {ECO:0000250|UniProtKB:P00307};
OS   Aphanizomenon flos-aquae.
OC   Bacteria; Cyanobacteria; Nostocales; Aphanizomenonaceae; Aphanizomenon.
OX   NCBI_TaxID=1176;
RN   [1] {ECO:0000305}
RP   PROTEIN SEQUENCE, AND MASS SPECTROMETRY.
RX   PubMed=19053161; DOI=10.1002/jms.1526;
RA   Rinalducci S., Roepstorff P., Zolla L.;
RT   "De novo sequence analysis and intact mass measurements for
RT   characterization of phycocyanin subunit isoforms from the blue-green alga
RT   Aphanizomenon flos-aquae.";
RL   J. Mass Spectrom. 44:503-515(2009).
CC   -!- FUNCTION: Light-harvesting photosynthetic bile pigment-protein from the
CC       phycobiliprotein complex. {ECO:0000250|UniProtKB:P00307}.
CC   -!- SUBUNIT: Heterodimer of an alpha and a beta subunit.
CC       {ECO:0000250|UniProtKB:P00307}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane
CC       {ECO:0000250|UniProtKB:P00307}; Peripheral membrane protein
CC       {ECO:0000250|UniProtKB:P00307}; Cytoplasmic side
CC       {ECO:0000250|UniProtKB:P00307}. Note=Part of the phycobilisome rod.
CC       {ECO:0000250|UniProtKB:P00307}.
CC   -!- PTM: Two isomers exist. {ECO:0000269|PubMed:19053161}.
CC   -!- PTM: Contains one covalently linked phycocyanobilin chromophore.
CC       {ECO:0000250|UniProtKB:P00307}.
CC   -!- MASS SPECTROMETRY: Mass=17714.72; Method=MALDI; Note=Major isomer.;
CC       Evidence={ECO:0000269|PubMed:19053161};
CC   -!- MASS SPECTROMETRY: Mass=17879.19; Method=MALDI; Note=Minor isomer.;
CC       Evidence={ECO:0000269|PubMed:19053161};
CC   -!- MASS SPECTROMETRY: Mass=17714.49; Method=Electrospray; Note=Major
CC       isomer.; Evidence={ECO:0000269|PubMed:19053161};
CC   -!- MASS SPECTROMETRY: Mass=17878.37; Method=Electrospray; Note=Minor
CC       isomer.; Evidence={ECO:0000269|PubMed:19053161};
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000255}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   AlphaFoldDB; P85868; -.
DR   SMR; P85868; -.
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   Pfam; PF00502; Phycobilisome; 1.
DR   SUPFAM; SSF46458; SSF46458; 1.
PE   1: Evidence at protein level;
KW   Antenna complex; Bile pigment; Chromophore; Direct protein sequencing;
KW   Electron transport; Membrane; Photosynthesis; Phycobilisome; Thylakoid;
KW   Transport.
FT   CHAIN           1..108
FT                   /note="C-phycocyanin alpha subunit"
FT                   /id="PRO_0000371457"
FT   NON_CONS        30..31
FT                   /evidence="ECO:0000303|PubMed:19053161"
FT   NON_CONS        40..41
FT                   /evidence="ECO:0000303|PubMed:19053161"
FT   NON_CONS        74..75
FT                   /evidence="ECO:0000303|PubMed:19053161"
FT   NON_CONS        82..83
FT                   /evidence="ECO:0000303|PubMed:19053161"
SQ   SEQUENCE   108 AA;  11500 MW;  A295F4C26B6FCC69 CRC64;
     MKTPITEAIA SADTQGRFLS NTELQAVDGR RAAASMEAAR AQKLIDGATS AVYSKFPYTT
     STPGNQYASD ARGKRDVGHY LRKANHGLSG QAANEANTYI DYAINALS