ID   APCB_SYNP2              Reviewed;         161 AA.
AC   O68970;
DT   11-JAN-2011, integrated into UniProtKB/Swiss-Prot.
DT   01-AUG-1998, sequence version 1.
DT   03-AUG-2022, entry version 135.
DE   RecName: Full=Allophycocyanin beta subunit;
GN   Name=apcB; OrderedLocusNames=SYNPCC7002_A1929;
OS   Synechococcus sp. (strain ATCC 27264 / PCC 7002 / PR-6) (Agmenellum
OS   quadruplicatum).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus;
OC   unclassified Synechococcus.
OX   NCBI_TaxID=32049;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=ATCC 27264 / PCC 7002 / PR-6;
RA   Zhou J., Stirewalt V.L., Bryant D.A.;
RT   "Cloning and characterization of the apcABC operon of Synechococcus sp. PCC
RT   7002.";
RL   Submitted (APR-1998) to the EMBL/GenBank/DDBJ databases.
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 27264 / PCC 7002 / PR-6;
RA   Li T., Zhao J., Zhao C., Liu Z., Zhao F., Marquardt J., Nomura C.T.,
RA   Persson S., Detter J.C., Richardson P.M., Lanz C., Schuster S.C., Wang J.,
RA   Li S., Huang X., Cai T., Yu Z., Luo J., Zhao J., Bryant D.A.;
RT   "Complete sequence of Synechococcus sp. PCC 7002.";
RL   Submitted (FEB-2008) to the EMBL/GenBank/DDBJ databases.
RN   [3]
RP   MASS SPECTROMETRY, METHYLATION AT ASN-71, AND CHROMOPHORE ATTACHMENT.
RC   STRAIN=ATCC 27264 / PCC 7002 / PR-6;
RX   PubMed=18199754; DOI=10.1074/jbc.m708164200;
RA   Shen G., Schluchter W.M., Bryant D.A.;
RT   "Biogenesis of phycobiliproteins: I. cpcS-I and cpcU mutants of the
RT   cyanobacterium Synechococcus sp. PCC 7002 define a heterodimeric
RT   phyococyanobilin lyase specific for beta-phycocyanin and allophycocyanin
RT   subunits.";
RL   J. Biol. Chem. 283:7503-7512(2008).
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: Heterodimer of an alpha and a beta chain.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane; Peripheral membrane
CC       protein; Cytoplasmic side. Note=Forms the core of the phycobilisome.
CC   -!- PTM: Contains one covalently linked phycocyanobilin chromophore. The
CC       chromophore is added by the phycocyanobilin lyase CpcUS.
CC   -!- MASS SPECTROMETRY: Mass=17817; Method=Electrospray; Note=The measured
CC       mass is that of the methylated protein plus one covalently linked
CC       phycocyanobilin chromophore.; Evidence={ECO:0000269|PubMed:18199754};
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   EMBL; AF059339; AAC14720.1; -; Genomic_DNA.
DR   EMBL; CP000951; ACA99916.1; -; Genomic_DNA.
DR   RefSeq; WP_012307539.1; NC_010475.1.
DR   PDB; 7EXT; EM; 3.50 A; B7/D7/F7/H3/I7/J3/K7/L3/M3/M7/O3/P7/R7/S3/T7/U3/W3/W7/Y3/Y7/a3/a7/c3/e3/h3/j3/l3/n3/p3/r3=1-161.
DR   PDBsum; 7EXT; -.
DR   AlphaFoldDB; O68970; -.
DR   SMR; O68970; -.
DR   STRING; 32049.SYNPCC7002_A1929; -.
DR   iPTMnet; O68970; -.
DR   EnsemblBacteria; ACA99916; ACA99916; SYNPCC7002_A1929.
DR   KEGG; syp:SYNPCC7002_A1929; -.
DR   eggNOG; ENOG502Z7X0; Bacteria.
DR   HOGENOM; CLU_104219_2_0_3; -.
DR   OMA; CIRDMDY; -.
DR   Proteomes; UP000001688; 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   CDD; cd12126; APC_beta; 1.
DR   Gene3D; 1.10.490.20; -; 1.
DR   InterPro; IPR006245; ApcB.
DR   InterPro; IPR009050; Globin-like_sf.
DR   InterPro; IPR012128; Phycobilisome_asu/bsu.
DR   InterPro; IPR038719; Phycobilisome_asu/bsu_sf.
DR   PANTHER; PTHR34011:SF3; PTHR34011:SF3; 1.
DR   Pfam; PF00502; Phycobilisome; 1.
DR   PIRSF; PIRSF000081; Phycocyanin; 1.
DR   SUPFAM; SSF46458; SSF46458; 1.
DR   TIGRFAMs; TIGR01337; apcB; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Antenna complex; Bile pigment; Chromophore;
KW   Electron transport; Membrane; Methylation; Photosynthesis; Phycobilisome;
KW   Reference proteome; Thylakoid; Transport.
FT   CHAIN           1..161
FT                   /note="Allophycocyanin beta subunit"
FT                   /id="PRO_0000403181"
FT   BINDING         81
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000305"
FT   MOD_RES         71
FT                   /note="N4-methylasparagine"
FT                   /evidence="ECO:0000305|PubMed:18199754"
SQ   SEQUENCE   161 AA;  17222 MW;  373FE8C10820098F CRC64;
     MQDAITSVIN SADVQGKYLD GSAMDKLKAY FTTGALRVRA ASTISANAAA IVKEAVAKSL
     LYSDVTRPGG NMYTTRRYAA CIRDLDYYLR YATYAMLAGD PSILDERVLN GLKETYNSLG
     VPVGSTVQAI QAMKEVTAGL VGADAGREMG VYFDYICSGL S