ID   PHAA2_MICDP             Reviewed;         161 AA.
AC   P16572;
DT   01-AUG-1990, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   03-AUG-2022, entry version 88.
DE   RecName: Full=Allophycocyanin alpha chain 2;
GN   Name=apcA2;
OS   Microchaete diplosiphon (Fremyella diplosiphon).
OC   Bacteria; Cyanobacteria; Nostocales; Rivulariaceae; Microchaete.
OX   NCBI_TaxID=1197;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=2461358; DOI=10.1128/jb.170.12.5512-5521.1988;
RA   Houmard J., Capuano V., Coursin T., Tandeau de Marsac N.;
RT   "Genes encoding core components of the phycobilisome in the cyanobacterium
RT   Calothrix sp. strain PCC 7601: occurrence of a multigene family.";
RL   J. Bacteriol. 170:5512-5521(1988).
CC   -!- FUNCTION: Light-harvesting photosynthetic bile pigment-protein from the
CC       phycobiliprotein complex. Allophycocyanin has a maximum absorption at
CC       approximately 650 nanometers.
CC   -!- SUBUNIT: Component of the phycobilisome. Heterodimer of an alpha and a
CC       beta chain (By similarity). {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000250};
CC       Peripheral membrane protein {ECO:0000250}; Cytoplasmic side
CC       {ECO:0000250}. Note=Forms the core of the phycobilisome. {ECO:0000250}.
CC   -!- PTM: Contains one covalently linked bilin chromophore. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   EMBL; M20807; AAA24877.1; -; Genomic_DNA.
DR   AlphaFoldDB; P16572; -.
DR   SMR; P16572; -.
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   PIRSF; PIRSF000081; Phycocyanin; 1.
DR   SUPFAM; SSF46458; SSF46458; 1.
PE   3: Inferred from homology;
KW   Antenna complex; Bile pigment; Chromophore; Electron transport; Membrane;
KW   Methylation; Photosynthesis; Phycobilisome; Thylakoid; Transport.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000250"
FT   CHAIN           2..161
FT                   /note="Allophycocyanin alpha chain 2"
FT                   /id="PRO_0000199072"
FT   BINDING         81
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000250"
FT   MOD_RES         71
FT                   /note="N4-methylasparagine"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   161 AA;  17853 MW;  69E44B97BD8386C4 CRC64;
     MSIITKMILN ADAEVRYLTP GELDQINIFV KSSQRRLQLV EALTQSRATI VKQAGKDIFQ
     RFPRLVAPGG NAYGENMTAT CLRDMDYYLR LITYSVAAGD TTPIQEIGIV GVRQMYRSLG
     TPIDAVAESV RAMKNITTSM LSGEDASEVG TYFDYLITNL Q