ID   APCB_SYNY3              Reviewed;         161 AA.
AC   Q01952;
DT   01-APR-1993, integrated into UniProtKB/Swiss-Prot.
DT   01-APR-1993, sequence version 1.
DT   03-AUG-2022, entry version 137.
DE   RecName: Full=Allophycocyanin beta chain;
GN   Name=apcB; OrderedLocusNames=slr1986;
OS   Synechocystis sp. (strain PCC 6803 / Kazusa).
OC   Bacteria; Cyanobacteria; Synechococcales; Merismopediaceae; Synechocystis;
OC   unclassified Synechocystis.
OX   NCBI_TaxID=1111708;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=1429645; DOI=10.1016/s0021-9258(18)50038-7;
RA   Su X., Goodman P., Bogorad L.;
RT   "Excitation energy transfer from phycocyanin to chlorophyll in an apcA-
RT   defective mutant of Synechocystis sp. PCC 6803.";
RL   J. Biol. Chem. 267:22944-22950(1992).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PCC 6803 / Kazusa;
RX   PubMed=8905231; DOI=10.1093/dnares/3.3.109;
RA   Kaneko T., Sato S., Kotani H., Tanaka A., Asamizu E., Nakamura Y.,
RA   Miyajima N., Hirosawa M., Sugiura M., Sasamoto S., Kimura T., Hosouchi T.,
RA   Matsuno A., Muraki A., Nakazaki N., Naruo K., Okumura S., Shimpo S.,
RA   Takeuchi C., Wada T., Watanabe A., Yamada M., Yasuda M., Tabata S.;
RT   "Sequence analysis of the genome of the unicellular cyanobacterium
RT   Synechocystis sp. strain PCC6803. II. Sequence determination of the entire
RT   genome and assignment of potential protein-coding regions.";
RL   DNA Res. 3:109-136(1996).
RN   [3]
RP   PROTEIN SEQUENCE OF 1-20.
RX   PubMed=9298645; DOI=10.1002/elps.1150180806;
RA   Sazuka T., Ohara O.;
RT   "Towards a proteome project of cyanobacterium Synechocystis sp. strain
RT   PCC6803: linking 130 protein spots with their respective genes.";
RL   Electrophoresis 18:1252-1258(1997).
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. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000250};
CC       Peripheral membrane protein {ECO:0000250}; Cytoplasmic side
CC       {ECO:0000250}. Note=Forms the core of the phycobilisome. {ECO:0000250}.
CC   -!- PTM: Contains one covalently linked phycocyanobilin chromophore.
CC       {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; M77135; AAA27277.1; -; Genomic_DNA.
DR   EMBL; BA000022; BAA17875.1; -; Genomic_DNA.
DR   PIR; B44462; B44462.
DR   PDB; 4PO5; X-ray; 1.75 A; B/D/F=1-161.
DR   PDBsum; 4PO5; -.
DR   AlphaFoldDB; Q01952; -.
DR   SMR; Q01952; -.
DR   IntAct; Q01952; 2.
DR   STRING; 1148.1652958; -.
DR   PaxDb; Q01952; -.
DR   EnsemblBacteria; BAA17875; BAA17875; BAA17875.
DR   KEGG; syn:slr1986; -.
DR   eggNOG; ENOG502Z7X0; Bacteria.
DR   InParanoid; Q01952; -.
DR   OMA; CIRDMDY; -.
DR   PhylomeDB; Q01952; -.
DR   Proteomes; UP000001425; 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   Direct protein sequencing; Electron transport; Membrane; Methylation;
KW   Photosynthesis; Phycobilisome; Reference proteome; Thylakoid; Transport.
FT   CHAIN           1..161
FT                   /note="Allophycocyanin beta chain"
FT                   /id="PRO_0000199105"
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"
FT   HELIX           4..13
FT                   /evidence="ECO:0007829|PDB:4PO5"
FT   TURN            14..16
FT                   /evidence="ECO:0007829|PDB:4PO5"
FT   HELIX           21..32
FT                   /evidence="ECO:0007829|PDB:4PO5"
FT   HELIX           34..59
FT                   /evidence="ECO:0007829|PDB:4PO5"
FT   TURN            60..62
FT                   /evidence="ECO:0007829|PDB:4PO5"
FT   HELIX           64..66
FT                   /evidence="ECO:0007829|PDB:4PO5"
FT   HELIX           75..98
FT                   /evidence="ECO:0007829|PDB:4PO5"
FT   HELIX           102..107
FT                   /evidence="ECO:0007829|PDB:4PO5"
FT   HELIX           112..119
FT                   /evidence="ECO:0007829|PDB:4PO5"
FT   HELIX           123..141
FT                   /evidence="ECO:0007829|PDB:4PO5"
FT   HELIX           143..160
FT                   /evidence="ECO:0007829|PDB:4PO5"
SQ   SEQUENCE   161 AA;  17216 MW;  63F01E5903BA1B83 CRC64;
     MQDAITAVIN SADVQGKYLD GAAMDKLKSY FASGELRVRA ASVISANAAT IVKEAVAKSL
     LYSDVTRPGG NMYTTRRYAA CIRDLDYYLR YATYAMLAGD ASILDERVLN GLKETYNSLG
     VPISSTVQAI QAIKEVTASL VGADAGKEMG VYLDYICSGL S