ID   PHAA2_NOSS1             Reviewed;         161 AA.
AC   Q8YZK7;
DT   11-JAN-2011, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2002, sequence version 1.
DT   03-AUG-2022, entry version 99.
DE   RecName: Full=Putative allophycocyanin subunit alpha 2;
GN   Name=apcA2; OrderedLocusNames=all0450;
OS   Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576).
OC   Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Nostoc.
OX   NCBI_TaxID=103690;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 7120 / SAG 25.82 / UTEX 2576;
RX   PubMed=11759840; DOI=10.1093/dnares/8.5.205;
RA   Kaneko T., Nakamura Y., Wolk C.P., Kuritz T., Sasamoto S., Watanabe A.,
RA   Iriguchi M., Ishikawa A., Kawashima K., Kimura T., Kishida Y., Kohara M.,
RA   Matsumoto M., Matsuno A., Muraki A., Nakazaki N., Shimpo S., Sugimoto M.,
RA   Takazawa M., Yamada M., Yasuda M., Tabata S.;
RT   "Complete genomic sequence of the filamentous nitrogen-fixing
RT   cyanobacterium Anabaena sp. strain PCC 7120.";
RL   DNA Res. 8:205-213(2001).
RN   [2]
RP   POSSIBLE CHROMOPHORE ATTACHMENT.
RC   STRAIN=PCC 7120 / SAG 25.82 / UTEX 2576;
RX   PubMed=17726096; DOI=10.1073/pnas.0706209104;
RA   Zhao K.H., Su P., Tu J.M., Wang X., Liu H., Ploscher M., Eichacker L.,
RA   Yang B., Zhou M., Scheer H.;
RT   "Phycobilin:cystein-84 biliprotein lyase, a near-universal lyase for
RT   cysteine-84-binding sites in cyanobacterial phycobiliproteins.";
RL   Proc. Natl. Acad. Sci. U.S.A. 104:14300-14305(2007).
CC   -!- FUNCTION: Light-harvesting photosynthetic bile pigment-protein from the
CC       phycobiliprotein complex. Allophycocyanin has a maximum absorption at
CC       approximately 650 to 653 nanometers (By similarity). {ECO:0000250}.
CC   -!- SUBUNIT: Heterohexamer of two alpha chains, one alpha-B chain and three
CC       beta chains. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane; Peripheral membrane
CC       protein; Cytoplasmic side. Note=Forms the core of the phycobilisome.
CC       {ECO:0000250}.
CC   -!- PTM: Contains one covalently linked phycocyanobilin chromophore (By
CC       similarity). The chromophore is added by phycocyanobilin lyase CpcS 1.
CC       {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
CC   -!- CAUTION: While chromophore attachment has been shown in a purified
CC       system in vitro, this chromoprotein has never been isolated in vivo.
CC       {ECO:0000305}.
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DR   EMBL; BA000019; BAB72408.1; -; Genomic_DNA.
DR   PIR; AI1862; AI1862.
DR   RefSeq; WP_010994626.1; NZ_RSCN01000024.1.
DR   AlphaFoldDB; Q8YZK7; -.
DR   SMR; Q8YZK7; -.
DR   STRING; 103690.17129795; -.
DR   EnsemblBacteria; BAB72408; BAB72408; BAB72408.
DR   KEGG; ana:all0450; -.
DR   eggNOG; ENOG502Z7RG; Bacteria.
DR   OMA; RIVKQSA; -.
DR   OrthoDB; 1461468at2; -.
DR   Proteomes; UP000002483; Chromosome.
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; Reference proteome; Thylakoid;
KW   Transport.
FT   CHAIN           1..161
FT                   /note="Putative allophycocyanin subunit alpha 2"
FT                   /id="PRO_0000403174"
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;  17945 MW;  3078BA8A0A558CBF CRC64;
     MSLIIKSILN ADAEARYFRP GELAQIKGFN ASAASRLRLV QALTENRERI VKQSANQLFQ
     KRPDIVSPGG NAYGQDMTAT CLRDMDYYLR LITYSIVAGD STPIQEIGVI GVREMYRSLG
     TPIEAVAESI RAMKYVATSM MSVEDRAEVD TYFDYLIGAM Q