ID   APCB_SYNP6              Reviewed;         161 AA.
AC   P06113;
DT   01-JAN-1988, integrated into UniProtKB/Swiss-Prot.
DT   01-JAN-1988, sequence version 1.
DT   03-AUG-2022, entry version 139.
DE   RecName: Full=Allophycocyanin beta chain;
GN   Name=apcB; OrderedLocusNames=syc1187_d;
OS   Synechococcus sp. (strain ATCC 27144 / PCC 6301 / SAUG 1402/1) (Anacystis
OS   nidulans).
OC   Bacteria; Cyanobacteria; Synechococcales; Synechococcaceae; Synechococcus.
OX   NCBI_TaxID=269084;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=3031427; DOI=10.1007/bf00338074;
RA   Houmard J., Mazel D., Moguet C., Bryant D.A., Tandeau de Marsac N.;
RT   "Organization and nucleotide sequence of genes encoding core components of
RT   the phycobilisomes from Synechococcus 6301.";
RL   Mol. Gen. Genet. 205:404-410(1986).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 27144 / PCC 6301 / SAUG 1402/1;
RX   PubMed=17211581; DOI=10.1007/s11120-006-9122-4;
RA   Sugita C., Ogata K., Shikata M., Jikuya H., Takano J., Furumichi M.,
RA   Kanehisa M., Omata T., Sugiura M., Sugita M.;
RT   "Complete nucleotide sequence of the freshwater unicellular cyanobacterium
RT   Synechococcus elongatus PCC 6301 chromosome: gene content and
RT   organization.";
RL   Photosyn. Res. 93:55-67(2007).
RN   [3]
RP   METHYLATION AT ASN-71.
RX   PubMed=3782095; DOI=10.1016/s0021-9258(18)66647-5;
RA   Klotz A.V., Leary J.A., Glazer A.N.;
RT   "Post-translational methylation of asparaginyl residues. Identification of
RT   beta-71 gamma-N-methylasparagine in allophycocyanin.";
RL   J. Biol. Chem. 261:15891-15894(1986).
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.
CC       {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   EMBL; X04716; CAA28422.1; -; Genomic_DNA.
DR   EMBL; AP008231; BAD79377.1; -; Genomic_DNA.
DR   RefSeq; WP_011243499.1; NC_006576.1.
DR   AlphaFoldDB; P06113; -.
DR   SMR; P06113; -.
DR   STRING; 269084.syc1187_d; -.
DR   iPTMnet; P06113; -.
DR   EnsemblBacteria; BAD79377; BAD79377; syc1187_d.
DR   KEGG; syc:syc1187_d; -.
DR   eggNOG; ENOG502Z7X0; Bacteria.
DR   OMA; CIRDMDY; -.
DR   Proteomes; UP000001175; 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   Antenna complex; Bile pigment; Chromophore; Electron transport; Membrane;
KW   Methylation; Photosynthesis; Phycobilisome; Thylakoid; Transport.
FT   CHAIN           1..161
FT                   /note="Allophycocyanin beta chain"
FT                   /id="PRO_0000199104"
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:0000269|PubMed:3782095"
SQ   SEQUENCE   161 AA;  17393 MW;  978F7F4AC8202167 CRC64;
     MQDAITAVIN ASDVQGKYLD SSALDRLKSY FQSGELRVRA AATISANSAL IVKEAVAKSL
     LYSDITRPGG NMYTTRRYAA CIRDLEYYLR YATYAMLAGD TSILDERVLN GLKETYNSLG
     VPIGATVQAI QAIKEVTASL VGPDAGREMG VYLDYISSGL S