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PHCB_ARTPT
ID   PHCB_ARTPT              Reviewed;         172 AA.
AC   P72508;
DT   15-DEC-1998, integrated into UniProtKB/Swiss-Prot.
DT   20-JUN-2001, sequence version 2.
DT   03-AUG-2022, entry version 107.
DE   RecName: Full=C-phycocyanin beta subunit;
GN   Name=cpcB;
OS   Arthrospira platensis (Spirulina platensis).
OC   Bacteria; Cyanobacteria; Oscillatoriophycideae; Oscillatoriales;
OC   Microcoleaceae; Arthrospira.
OX   NCBI_TaxID=118562;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=C1;
RA   Jeamton W., Chaisawadi S., Deshnium P., Castets A.M., Coursin T.,
RA   Tandeau de Marsac N., Tanticharoen M., Cheevadhanarak S.;
RL   Submitted (OCT-1996) to the EMBL/GenBank/DDBJ databases.
RN   [2] {ECO:0007744|PDB:1GH0}
RP   X-RAY CRYSTALLOGRAPHY (2.20 ANGSTROMS) IN COMPLEX WITH PHYCOCYANOBILIN
RP   CHROMOPHORE, SUBUNIT, METHYLATION AT ASN-72, AND SEQUENCE REVISION TO 76.
RX   PubMed=11375497; DOI=10.1107/s0907444901004528;
RA   Wang X.Q., Li L.N., Chang W.R., Zhang J.P., Gui L.L., Guo B.J., Liang D.C.;
RT   "Structure of C-phycocyanin from Spirulina platensis at 2.2 A resolution: a
RT   novel monoclinic crystal form for phycobiliproteins in phycobilisomes.";
RL   Acta Crystallogr. D 57:784-792(2001).
RN   [3] {ECO:0007744|PDB:1HA7}
RP   X-RAY CRYSTALLOGRAPHY (2.2 ANGSTROMS) IN COMPLEX WITH PHYCOCYANOBILIN
RP   CHROMOPHORE, METHYLATION AT ASN-72, AND SEQUENCE REVISION TO 76.
RX   PubMed=11352634; DOI=10.1006/bbrc.2001.4663;
RA   Padyana A.K., Bhat V.B., Madhyasta K.M., Rajashankar K.R., Ramakumar S.;
RT   "Crystal structure of a light-harvesting protein C-phycocyanin from
RT   Spirulina platensis.";
RL   Biochem. Biophys. Res. Commun. 282:893-898(2001).
RN   [4] {ECO:0007744|PDB:2UUM}
RP   X-RAY CRYSTALLOGRAPHY (3.00 ANGSTROMS) IN COMPLEX WITH PHYCOCYANOBILIN
RP   CHROMOPHORE, AND SUBUNIT.
RA   Satyanarayana L., Patel A., Mishra S., Ghosh P.K., Suresh C.G.;
RT   "Crystal Structure of C-Phycocyanin from Phormidium, Lyngbya Spp. (Marine)
RT   and Spirulina Sp. (Fresh Water) Shows Two Different Ways of Energy Transfer
RT   between Two Hexamers.";
RL   Submitted (MAR-2007) to the PDB data bank.
CC   -!- FUNCTION: Light-harvesting photosynthetic bile pigment-protein from the
CC       phycobiliprotein complex (phycobilisome, PBS). Phycocyanin is the major
CC       phycobiliprotein in the PBS rod.
CC   -!- SUBUNIT: The alpha and beta subunits exhibit high affinity for one
CC       another and form heterodimers. These heterodimers form heterohexamers
CC       of 3 alpha and 3 beta subunits which, in turn, aggregate into a
CC       heterododecamer consisting of 2 heterohexamers.
CC       {ECO:0000269|PubMed:11352634, ECO:0000269|PubMed:11375497}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane; Peripheral membrane
CC       protein; Cytoplasmic side. Note=Part of the phycobilisome rod.
CC   -!- PTM: Contains two covalently linked bilin chromophores.
CC       {ECO:0000269|PubMed:11352634, ECO:0000269|PubMed:11375497,
CC       ECO:0007744|PDB:1GH0, ECO:0007744|PDB:1HA7, ECO:0007744|PDB:2UUM}.
CC   -!- SIMILARITY: Belongs to the phycobiliprotein family. {ECO:0000305}.
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DR   EMBL; Y09074; CAA70295.1; -; Genomic_DNA.
DR   PDB; 1GH0; X-ray; 2.20 A; B/D/F/H/J/L/N/P/R/T/V/X=1-172.
DR   PDB; 1HA7; X-ray; 2.20 A; B/D/F/H/J/L/N/P/R/T/V/X=1-172.
DR   PDB; 2UUM; X-ray; 3.00 A; B/D/F/H/J/L/N/P/R/T/V/X=1-172.
DR   PDBsum; 1GH0; -.
DR   PDBsum; 1HA7; -.
DR   PDBsum; 2UUM; -.
DR   AlphaFoldDB; P72508; -.
DR   SMR; P72508; -.
DR   Allergome; 8833; Art pl beta_Phycocyanin.
DR   iPTMnet; P72508; -.
DR   EvolutionaryTrace; P72508; -.
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   InterPro; IPR006247; Phycocyanin_b.
DR   Pfam; PF00502; Phycobilisome; 1.
DR   PIRSF; PIRSF000081; Phycocyanin; 1.
DR   SUPFAM; SSF46458; SSF46458; 1.
DR   TIGRFAMs; TIGR01339; phycocy_beta; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Antenna complex; Bile pigment; Chromophore;
KW   Electron transport; Membrane; Methylation; Photosynthesis; Phycobilisome;
KW   Thylakoid; Transport.
FT   CHAIN           1..172
FT                   /note="C-phycocyanin beta subunit"
FT                   /id="PRO_0000199155"
FT   BINDING         82
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /ligand_label="1"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000269|PubMed:11352634,
FT                   ECO:0000269|PubMed:11375497, ECO:0007744|PDB:1GH0,
FT                   ECO:0007744|PDB:1HA7, ECO:0007744|PDB:2UUM"
FT   BINDING         153
FT                   /ligand="(2R,3E)-phycocyanobilin"
FT                   /ligand_id="ChEBI:CHEBI:85275"
FT                   /ligand_label="2"
FT                   /note="covalent, via 1 link"
FT                   /evidence="ECO:0000269|PubMed:11352634,
FT                   ECO:0000269|PubMed:11375497, ECO:0007744|PDB:1GH0,
FT                   ECO:0007744|PDB:1HA7, ECO:0007744|PDB:2UUM"
FT   MOD_RES         72
FT                   /note="N4-methylasparagine"
FT                   /evidence="ECO:0000269|PubMed:11352634,
FT                   ECO:0000269|PubMed:11375497, ECO:0007744|PDB:1GH0,
FT                   ECO:0007744|PDB:1HA7"
FT   CONFLICT        76
FT                   /note="S -> N (in Ref. 1; CAA70295)"
FT                   /evidence="ECO:0000305"
FT   HELIX           4..14
FT                   /evidence="ECO:0007829|PDB:1GH0"
FT   HELIX           21..32
FT                   /evidence="ECO:0007829|PDB:1GH0"
FT   HELIX           34..46
FT                   /evidence="ECO:0007829|PDB:1GH0"
FT   HELIX           48..62
FT                   /evidence="ECO:0007829|PDB:1GH0"
FT   HELIX           64..66
FT                   /evidence="ECO:0007829|PDB:1GH0"
FT   HELIX           76..99
FT                   /evidence="ECO:0007829|PDB:1GH0"
FT   HELIX           103..108
FT                   /evidence="ECO:0007829|PDB:1GH0"
FT   TURN            109..112
FT                   /evidence="ECO:0007829|PDB:1GH0"
FT   HELIX           113..120
FT                   /evidence="ECO:0007829|PDB:1GH0"
FT   HELIX           124..142
FT                   /evidence="ECO:0007829|PDB:1GH0"
FT   HELIX           154..171
FT                   /evidence="ECO:0007829|PDB:1GH0"
SQ   SEQUENCE   172 AA;  18094 MW;  541754A562E4301C CRC64;
     MFDAFTKVVS QADTRGEMLS TAQIDALSQM VAESNKRLDA VNRITSNAST IVSNAARSLF
     AEQPQLIAPG GNAYTSRRMA ACLRDMEIIL RYVTYAVFAG DASVLEDRCL NGLRETYLAL
     GTPGSSVAVG VGKMKEAALA IVNDPAGITP GDCSALASEI ASYFDRACAA VS
 
 
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