ID   APCF_SYNP2              Reviewed;         169 AA.
AC   O68967;
DT   11-JAN-2011, integrated into UniProtKB/Swiss-Prot.
DT   01-AUG-1998, sequence version 1.
DT   03-AUG-2022, entry version 132.
DE   RecName: Full=Allophycocyanin subunit beta-18;
DE            Short=Allophycocyanin subunit B18;
GN   Name=apcF; OrderedLocusNames=SYNPCC7002_A1631;
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 apcF gene 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   CHROMOPHORE ATTACHMENT.
RC   STRAIN=ATCC 27264 / PCC 7002 / PR-6;
RX   PubMed=20228104; DOI=10.1128/aem.03100-09;
RA   Biswas A., Vasquez Y.M., Dragomani T.M., Kronfel M.L., Williams S.R.,
RA   Alvey R.M., Bryant D.A., Schluchter W.M.;
RT   "Biosynthesis of cyanobacterial phycobiliproteins in Escherichia coli:
RT   chromophorylation efficiency and specificity of all bilin lyases from
RT   Synechococcus sp. strain PCC 7002.";
RL   Appl. Environ. Microbiol. 76:2729-2739(2010).
CC   -!- FUNCTION: A variant beta-allophycocyanin (AP) which forms a complex
CC       with ApcE, a phycobilisome terminal emitter that influences energy
CC       transfer to photosystem II. {ECO:0000250}.
CC   -!- SUBUNIT: Heterodimer of ApcE and this beta chain. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000250};
CC       Peripheral membrane protein {ECO:0000250}; Cytoplasmic side
CC       {ECO:0000250}.
CC   -!- PTM: Contains one covalently linked bilin chromophore. The chromophore
CC       is added by phycocyanobilin lyase CpcUS.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   EMBL; AF059338; AAC14717.1; -; Genomic_DNA.
DR   EMBL; CP000951; ACA99621.1; -; Genomic_DNA.
DR   RefSeq; WP_012307244.1; NC_010475.1.
DR   PDB; 7EXT; EM; 3.50 A; Q3/g3=1-169.
DR   PDBsum; 7EXT; -.
DR   AlphaFoldDB; O68967; -.
DR   SMR; O68967; -.
DR   STRING; 32049.SYNPCC7002_A1631; -.
DR   EnsemblBacteria; ACA99621; ACA99621; SYNPCC7002_A1631.
DR   KEGG; syp:SYNPCC7002_A1631; -.
DR   eggNOG; ENOG502Z8IM; Bacteria.
DR   HOGENOM; CLU_104219_2_0_3; -.
DR   OMA; LRDMDYF; -.
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..169
FT                   /note="Allophycocyanin subunit beta-18"
FT                   /id="PRO_0000403179"
FT   BINDING         82
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000305"
FT   MOD_RES         72
FT                   /note="N4-methylasparagine"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   169 AA;  18724 MW;  F493011374C2B473 CRC64;
     MRDAVTSLIR NYDTTGRYFD RDAIESLKDY FASGNDRITV AAMINSQSAE IVKAAANSLF
     EAVPELLLAG GNAYTTRRFS ACLRDMDYYL RYGTYALIAG DMDVLNERVL QGLRETYNSL
     GVPIAPTVRG IQFLKDAIKE MAAAAGIANT AFIDEPFDHM TRELSEVDL