ID   APCD_SYNP2              Reviewed;         161 AA.
AC   O68966;
DT   11-JAN-2011, integrated into UniProtKB/Swiss-Prot.
DT   01-AUG-1998, sequence version 1.
DT   03-AUG-2022, entry version 125.
DE   RecName: Full=Allophycocyanin subunit alpha-B;
DE   AltName: Full=alpha-AP-B;
GN   Name=apcD; OrderedLocusNames=SYNPCC7002_A2140;
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 apcD 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 alpha-allophycocyanin (AP) which forms a complex
CC       with beta-AP with maximum absorption at approximately 670 nanometers.
CC       It is an important phycobilisome terminal emitter involved in energy
CC       transfer to photosystem I (By similarity). {ECO:0000250}.
CC   -!- SUBUNIT: Heterodimer of an alpha-B and a beta chain forming AP-B.
CC       {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; AF059337; AAC14716.1; -; Genomic_DNA.
DR   EMBL; CP000951; ACB00121.1; -; Genomic_DNA.
DR   RefSeq; WP_012307741.1; NC_010475.1.
DR   PDB; 7EXT; EM; 3.50 A; V3/m3=1-161.
DR   PDBsum; 7EXT; -.
DR   AlphaFoldDB; O68966; -.
DR   SMR; O68966; -.
DR   STRING; 32049.SYNPCC7002_A2140; -.
DR   EnsemblBacteria; ACB00121; ACB00121; SYNPCC7002_A2140.
DR   KEGG; syp:SYNPCC7002_A2140; -.
DR   eggNOG; ENOG502Z81S; Bacteria.
DR   HOGENOM; CLU_104219_2_0_3; -.
DR   OMA; LIGVREM; -.
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   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   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 subunit alpha-B"
FT                   /id="PRO_0000403176"
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:0000250"
SQ   SEQUENCE   161 AA;  17702 MW;  157005537F41D6DD CRC64;
     MSVVSQVILR ADDELRYPSS GELSGIKNFL ATGAVRIRIA EALADNEKKI VDQAQKQLFS
     IHPEYRTSGG NAATTKQYNQ CLRDYGWYLR LVTYGILAGD KDPIERIGLI GVKEMYNALG
     VPVPGMVDAI RCLKDAALGV LDSEEARIAA PYFDFITQAM S