ID   PSBF_CROS5              Reviewed;          44 AA.
AC   B1WVR8;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   20-MAY-2008, sequence version 1.
DT   03-AUG-2022, entry version 67.
DE   RecName: Full=Cytochrome b559 subunit beta {ECO:0000255|HAMAP-Rule:MF_00643};
DE   AltName: Full=PSII reaction center subunit VI {ECO:0000255|HAMAP-Rule:MF_00643};
GN   Name=psbF {ECO:0000255|HAMAP-Rule:MF_00643}; OrderedLocusNames=cce_1305;
OS   Crocosphaera subtropica (strain ATCC 51142 / BH68) (Cyanothece sp. (strain
OS   ATCC 51142)).
OC   Bacteria; Cyanobacteria; Oscillatoriophycideae; Chroococcales;
OC   Aphanothecaceae; Crocosphaera; Crocosphaera subtropica.
OX   NCBI_TaxID=43989;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 51142 / BH68;
RX   PubMed=18812508; DOI=10.1073/pnas.0805418105;
RA   Welsh E.A., Liberton M., Stoeckel J., Loh T., Elvitigala T., Wang C.,
RA   Wollam A., Fulton R.S., Clifton S.W., Jacobs J.M., Aurora R., Ghosh B.K.,
RA   Sherman L.A., Smith R.D., Wilson R.K., Pakrasi H.B.;
RT   "The genome of Cyanothece 51142, a unicellular diazotrophic cyanobacterium
RT   important in the marine nitrogen cycle.";
RL   Proc. Natl. Acad. Sci. U.S.A. 105:15094-15099(2008).
CC   -!- FUNCTION: This b-type cytochrome is tightly associated with the
CC       reaction center of photosystem II (PSII). PSII is a light-driven
CC       water:plastoquinone oxidoreductase that uses light energy to abstract
CC       electrons from H(2)O, generating O(2) and a proton gradient
CC       subsequently used for ATP formation. It consists of a core antenna
CC       complex that captures photons, and an electron transfer chain that
CC       converts photonic excitation into a charge separation.
CC       {ECO:0000255|HAMAP-Rule:MF_00643}.
CC   -!- COFACTOR:
CC       Name=heme b; Xref=ChEBI:CHEBI:60344;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00643};
CC       Note=With its partner (PsbE) binds heme. PSII binds additional
CC       chlorophylls, carotenoids and specific lipids. {ECO:0000255|HAMAP-
CC       Rule:MF_00643};
CC   -!- SUBUNIT: Heterodimer of an alpha subunit and a beta subunit.
CC       Cyanobacterial PSII is composed of 1 copy each of membrane proteins
CC       PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM,
CC       PsbT, PsbX, PsbY, PsbZ, Ycf12, at least 3 peripheral proteins PsbO,
CC       PsbU, PsbV and a large number of cofactors. It forms dimeric complexes.
CC       {ECO:0000255|HAMAP-Rule:MF_00643}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_00643}; Single-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_00643}.
CC   -!- SIMILARITY: Belongs to the PsbE/PsbF family. {ECO:0000255|HAMAP-
CC       Rule:MF_00643}.
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DR   EMBL; CP000806; ACB50655.1; -; Genomic_DNA.
DR   RefSeq; WP_009544127.1; NC_010546.1.
DR   AlphaFoldDB; B1WVR8; -.
DR   SMR; B1WVR8; -.
DR   STRING; 43989.cce_1305; -.
DR   EnsemblBacteria; ACB50655; ACB50655; cce_1305.
DR   KEGG; cyt:cce_1305; -.
DR   eggNOG; ENOG50332KX; Bacteria.
DR   HOGENOM; CLU_211753_1_0_3; -.
DR   OrthoDB; 2060731at2; -.
DR   Proteomes; UP000001203; Chromosome circular.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0009539; C:photosystem II reaction center; IEA:InterPro.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0009055; F:electron transfer activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0020037; F:heme binding; IEA:InterPro.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0009767; P:photosynthetic electron transport chain; IEA:InterPro.
DR   HAMAP; MF_00643; PSII_PsbF; 1.
DR   InterPro; IPR006241; PSII_cyt_b559_bsu.
DR   InterPro; IPR006216; PSII_cyt_b559_CS.
DR   InterPro; IPR013081; PSII_cyt_b559_N.
DR   PANTHER; PTHR33391:SF14; PTHR33391:SF14; 1.
DR   Pfam; PF00283; Cytochrom_B559; 1.
DR   PIRSF; PIRSF000037; PsbF; 1.
DR   TIGRFAMs; TIGR01333; cyt_b559_beta; 1.
DR   PROSITE; PS00537; CYTOCHROME_B559; 1.
PE   3: Inferred from homology;
KW   Electron transport; Heme; Iron; Membrane; Metal-binding; Photosynthesis;
KW   Photosystem II; Reference proteome; Thylakoid; Transmembrane;
KW   Transmembrane helix; Transport.
FT   CHAIN           1..44
FT                   /note="Cytochrome b559 subunit beta"
FT                   /id="PRO_1000147430"
FT   TRANSMEM        19..35
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00643"
FT   BINDING         23
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_note="ligand shared with alpha subunit"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00643"
SQ   SEQUENCE   44 AA;  4939 MW;  E0E312A7567A36D9 CRC64;
     MVNNTSNQPT SYPIFTVRWL AVHTLAVPTV FFVGAIAAMQ FIQR