ID   PHEA_PORSO              Reviewed;         164 AA.
AC   P29947;
DT   01-APR-1993, integrated into UniProtKB/Swiss-Prot.
DT   01-APR-1993, sequence version 1.
DT   03-AUG-2022, entry version 85.
DE   RecName: Full=B-phycoerythrin alpha chain;
GN   Name=cpeA;
OS   Porphyridium sordidum (Red alga).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Bangiophyceae; Porphyridiales; Porphyridiaceae;
OC   Porphyridium.
OX   NCBI_TaxID=28024;
RN   [1]
RP   X-RAY CRYSTALLOGRAPHY (2.2 ANGSTROMS), CHROMOPHORE BINDING AT CYS-82 AND
RP   CYS-139, AND PARTIAL PROTEIN SEQUENCE.
RX   PubMed=1469725; DOI=10.1016/0022-2836(92)90876-l;
RA   Ficner R., Lobeck K., Schmidt G., Huber R.;
RT   "Isolation, crystallization, crystal structure analysis and refinement of
RT   B-phycoerythrin from the red alga Porphyridium sordidum at 2.2-A
RT   resolution.";
RL   J. Mol. Biol. 228:935-950(1992).
CC   -!- FUNCTION: Light-harvesting photosynthetic bile pigment-protein from the
CC       phycobiliprotein complex.
CC   -!- SUBUNIT: Heteromer of 6 alpha, 6 beta and one gamma chain.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast thylakoid membrane
CC       {ECO:0000250}; Peripheral membrane protein {ECO:0000250}; Stromal side
CC       {ECO:0000250}. Note=Forms the periphery of the phycobilisome rod.
CC       {ECO:0000250}.
CC   -!- PTM: Contains two covalently linked bilin chromophores.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   PIR; S27326; S27326.
DR   AlphaFoldDB; P29947; -.
DR   SMR; P29947; -.
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   Pfam; PF00502; Phycobilisome; 1.
DR   PIRSF; PIRSF000081; Phycocyanin; 1.
DR   SUPFAM; SSF46458; SSF46458; 1.
PE   1: Evidence at protein level;
KW   Antenna complex; Bile pigment; Chloroplast; Chromophore;
KW   Direct protein sequencing; Electron transport; Membrane; Photosynthesis;
KW   Phycobilisome; Plastid; Thylakoid; Transport.
FT   CHAIN           1..164
FT                   /note="B-phycoerythrin alpha chain"
FT                   /id="PRO_0000199178"
FT   BINDING         82
FT                   /ligand="(2R,3E)-phycoerythrobilin"
FT                   /ligand_id="ChEBI:CHEBI:85276"
FT                   /ligand_label="1"
FT                   /note="covalent, via 1 link"
FT   BINDING         139
FT                   /ligand="(2R,3E)-phycoerythrobilin"
FT                   /ligand_id="ChEBI:CHEBI:85276"
FT                   /ligand_label="2"
FT                   /note="covalent, via 1 link"
SQ   SEQUENCE   164 AA;  17831 MW;  A71776170CE1EC91 CRC64;
     MKSVITTVIS AADAAGRFPS NSDLESIQGN IQRSAARLEA AEKLAGNHEA VVKEAGDACF
     AKYAYLKNPG EAGENQEKIN KCYRDVDHYM RLVNYDLVVG GTGPLDEWGI AGAREVYRTL
     NLPTSAYVAS IAYTRDRLCV PRDMSAQAGV EFSAYLDYLI NALS