ID   PCB_PRODI               Reviewed;         350 AA.
AC   Q6Q972; Q51690;
DT   24-JAN-2006, integrated into UniProtKB/Swiss-Prot.
DT   05-JUL-2004, sequence version 1.
DT   03-AUG-2022, entry version 56.
DE   RecName: Full=Chlorophyll a/b light-harvesting protein Pcb;
GN   Name=pcb;
OS   Prochloron didemni.
OC   Bacteria; Cyanobacteria; Synechococcales; Prochloraceae; Prochloron.
OX   NCBI_TaxID=1216;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA], AND FUNCTION.
RX   PubMed=15356274; DOI=10.1093/molbev/msh250;
RA   Chen M., Hiller R.G., Howe C.J., Larkum A.W.D.;
RT   "Unique origin and lateral transfer of prokaryotic chlorophyll-b and
RT   chlorophyll-d light-harvesting systems.";
RL   Mol. Biol. Evol. 22:21-28(2005).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 3-323, PROTEIN SEQUENCE OF 3-23 AND
RP   121-143, AND FUNCTION.
RX   PubMed=8986795; DOI=10.1073/pnas.93.26.15244;
RA   La Roche J., van der Staay G.W.M., Partensky F., Ducret A., Aebersold R.R.,
RA   Li R., Golden S.S., Hiller R.G., Wrench P.M., Larkum A.W.D., Green B.R.;
RT   "Independent evolution of the prochlorophyte and green plant chlorophyll
RT   a/b light-harvesting proteins.";
RL   Proc. Natl. Acad. Sci. U.S.A. 93:15244-15248(1996).
RN   [3]
RP   FUNCTION, SUBCELLULAR LOCATION, BINDING TO CHLOROPHYLL A AND B, COFACTOR,
RP   INVOLVEMENT IN COMPLEXES WITH PHOTOSYSTEM II, AND SUBUNIT.
RX   PubMed=12837938; DOI=10.1073/pnas.1532271100;
RA   Bibby T.S., Nield J., Chen M., Larkum A.W.D., Barber J.;
RT   "Structure of a photosystem II supercomplex isolated from Prochloron
RT   didemni retaining its chlorophyll a/b light-harvesting system.";
RL   Proc. Natl. Acad. Sci. U.S.A. 100:9050-9054(2003).
CC   -!- FUNCTION: The antenna complex functions as a light receptor, it
CC       captures and delivers excitation energy to photosystem II (PSII). The
CC       Prochlorales pcb genes are not related to higher plant LHCs.
CC       {ECO:0000269|PubMed:12837938, ECO:0000303|PubMed:15356274,
CC       ECO:0000303|PubMed:8986795}.
CC   -!- COFACTOR:
CC       Name=chlorophyll a; Xref=ChEBI:CHEBI:58416;
CC         Evidence={ECO:0000269|PubMed:12837938};
CC       Note=Chlorophyll a. {ECO:0000269|PubMed:12837938};
CC   -!- COFACTOR:
CC       Name=chlorophyll b; Xref=ChEBI:CHEBI:61721;
CC         Evidence={ECO:0000269|PubMed:12837938};
CC       Note=Chlorophyll b. {ECO:0000269|PubMed:12837938};
CC   -!- SUBUNIT: The antenna complex consists of chlorophylls (a and b) and
CC       chlorophyll a/b binding proteins. Also forms complexes with photosystem
CC       II (PSII), consisting of a PSII dimer with 5 or 10 associated Pcb
CC       subunits. {ECO:0000269|PubMed:12837938}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane
CC       {ECO:0000269|PubMed:12837938}; Multi-pass membrane protein
CC       {ECO:0000269|PubMed:12837938}.
CC   -!- MISCELLANEOUS: PubMed:8986795 speculates that the protein is probably 2
CC       residues longer than sequenced. {ECO:0000303|PubMed:8986795}.
CC   -!- SIMILARITY: Belongs to the PsbB/PsbC family. IsiA/Pcb subfamily.
CC       {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; AY552464; AAS76631.1; -; Genomic_DNA.
DR   EMBL; Z72476; CAA96551.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q6Q972; -.
DR   SMR; Q6Q972; -.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0009523; C:photosystem II; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0016168; F:chlorophyll binding; IEA:UniProtKB-KW.
DR   GO; GO:0009767; P:photosynthetic electron transport chain; IEA:InterPro.
DR   InterPro; IPR000932; PS_antenna-like.
DR   InterPro; IPR036001; PS_II_antenna-like_sf.
DR   PANTHER; PTHR33180; PTHR33180; 1.
DR   Pfam; PF00421; PSII; 1.
DR   SUPFAM; SSF161077; SSF161077; 1.
PE   1: Evidence at protein level;
KW   Chlorophyll; Chromophore; Direct protein sequencing; Membrane;
KW   Photosynthesis; Photosystem II; Thylakoid; Transmembrane;
KW   Transmembrane helix.
FT   CHAIN           1..350
FT                   /note="Chlorophyll a/b light-harvesting protein Pcb"
FT                   /id="PRO_0000077534"
FT   TRANSMEM        30..50
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        66..86
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        91..111
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        204..224
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        243..263
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        304..324
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   CONFLICT        220
FT                   /note="L -> I (in Ref. 2; CAA96551)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        230
FT                   /note="W -> L (in Ref. 2; CAA96551)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        270
FT                   /note="V -> G (in Ref. 2; CAA96551)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        295
FT                   /note="S -> I (in Ref. 2; CAA96551)"
FT                   /evidence="ECO:0000305"
SQ   SEQUENCE   350 AA;  38177 MW;  404DCB1CD5A97EBE CRC64;
     MGMQTYGNPD VEYGWWAGNS RLAGFSGKWL AAHVAQAALI VFWAGAICLF EVARYTADVP
     LGEQNLILIP HMASLGLGIG EGGQIVDTFP YFAVGVVHLV SSAVIGAGGL YHSLRGPAIL
     KEGPARAPKF DFDWGDGKRL GFILGHHLIL LGLGALFLVL WAVFFGIYDP VIGEVRTVTS
     PTLNPFTIFG YQTHFVETNT LEDLIGGHVY VAIIEISGGL WHIFCPPFKW AQRLIIYSGE
     GLLAYALGGL AIMGFTAAVY CAFNTLAYPV EFYGPPLDFR FSFAPYFIDT ADLPSGQYTA
     RAWLCNVHFF LAFFVLQGHL WHALRTLGFD FKRIPAALGS LSEDVVDAKA