ID UCRI_CYAP4 Reviewed; 179 AA. AC B8HNR1; DT 28-JUL-2009, integrated into UniProtKB/Swiss-Prot. DT 03-MAR-2009, sequence version 1. DT 27-MAR-2024, entry version 81. DE RecName: Full=Cytochrome b6-f complex iron-sulfur subunit {ECO:0000255|HAMAP-Rule:MF_01335}; DE EC=7.1.1.6 {ECO:0000255|HAMAP-Rule:MF_01335}; DE AltName: Full=Plastohydroquinone:plastocyanin oxidoreductase iron-sulfur protein {ECO:0000255|HAMAP-Rule:MF_01335}; DE Short=ISP {ECO:0000255|HAMAP-Rule:MF_01335}; DE Short=RISP {ECO:0000255|HAMAP-Rule:MF_01335}; DE AltName: Full=Rieske iron-sulfur protein {ECO:0000255|HAMAP-Rule:MF_01335}; GN Name=petC {ECO:0000255|HAMAP-Rule:MF_01335}; GN OrderedLocusNames=Cyan7425_1419; OS Cyanothece sp. (strain PCC 7425 / ATCC 29141). OC Bacteria; Cyanobacteriota; Cyanophyceae; Gomontiellales; Cyanothecaceae; OC Cyanothece. OX NCBI_TaxID=395961; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=PCC 7425 / ATCC 29141; RX PubMed=21972240; DOI=10.1128/mbio.00214-11; RA Bandyopadhyay A., Elvitigala T., Welsh E., Stockel J., Liberton M., Min H., RA Sherman L.A., Pakrasi H.B.; RT "Novel metabolic attributes of the genus Cyanothece, comprising a group of RT unicellular nitrogen-fixing Cyanobacteria."; RL MBio 2:E214-E214(2011). CC -!- FUNCTION: Component of the cytochrome b6-f complex, which mediates CC electron transfer between photosystem II (PSII) and photosystem I CC (PSI), cyclic electron flow around PSI, and state transitions. CC {ECO:0000255|HAMAP-Rule:MF_01335}. CC -!- CATALYTIC ACTIVITY: CC Reaction=a plastoquinol + 2 H(+)(in) + 2 oxidized [plastocyanin] = a CC plastoquinone + 4 H(+)(out) + 2 reduced [plastocyanin]; CC Xref=Rhea:RHEA:22148, Rhea:RHEA-COMP:9561, Rhea:RHEA-COMP:9562, CC Rhea:RHEA-COMP:10039, Rhea:RHEA-COMP:10040, ChEBI:CHEBI:15378, CC ChEBI:CHEBI:17757, ChEBI:CHEBI:29036, ChEBI:CHEBI:49552, CC ChEBI:CHEBI:62192; EC=7.1.1.6; Evidence={ECO:0000255|HAMAP- CC Rule:MF_01335}; CC -!- COFACTOR: CC Name=[2Fe-2S] cluster; Xref=ChEBI:CHEBI:190135; CC Evidence={ECO:0000255|HAMAP-Rule:MF_01335}; CC Note=Binds 1 [2Fe-2S] cluster per subunit. {ECO:0000255|HAMAP- CC Rule:MF_01335}; CC -!- SUBUNIT: The 4 large subunits of the cytochrome b6-f complex are CC cytochrome b6, subunit IV (17 kDa polypeptide, PetD), cytochrome f and CC the Rieske protein, while the 4 small subunits are PetG, PetL, PetM and CC PetN. The complex functions as a dimer. {ECO:0000255|HAMAP- CC Rule:MF_01335}. CC -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP- CC Rule:MF_01335}; Single-pass membrane protein {ECO:0000255|HAMAP- CC Rule:MF_01335}. Note=The transmembrane helix obliquely spans the CC membrane in one monomer, and its extrinsic C-terminal domain is part of CC the other monomer. {ECO:0000255|HAMAP-Rule:MF_01335}. CC -!- MISCELLANEOUS: The Rieske iron-sulfur protein is a high potential 2Fe- CC 2S protein. CC -!- SIMILARITY: Belongs to the Rieske iron-sulfur protein family. CC {ECO:0000255|HAMAP-Rule:MF_01335}. 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; CP001344; ACL43792.1; -; Genomic_DNA. DR AlphaFoldDB; B8HNR1; -. DR SMR; B8HNR1; -. DR STRING; 395961.Cyan7425_1419; -. DR KEGG; cyn:Cyan7425_1419; -. DR eggNOG; COG0723; Bacteria. DR HOGENOM; CLU_055690_8_0_3; -. DR OrthoDB; 9767869at2; -. DR GO; GO:0043231; C:intracellular membrane-bounded organelle; IEA:UniProt. DR GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell. DR GO; GO:0051537; F:2 iron, 2 sulfur cluster binding; IEA:UniProtKB-KW. DR GO; GO:0045158; F:electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity; IEA:UniProtKB-UniRule. DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW. DR GO; GO:0009496; F:plastoquinol--plastocyanin reductase activity; IEA:UniProtKB-UniRule. DR GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule. DR CDD; cd03471; Rieske_cytochrome_b6f; 1. DR Gene3D; 2.102.10.10; Rieske [2Fe-2S] iron-sulphur domain; 1. DR Gene3D; 1.20.5.700; Single helix bin; 1. DR HAMAP; MF_01335; Cytb6_f_Rieske; 1. DR InterPro; IPR023960; Cyt_b6_f_Rieske. DR InterPro; IPR017941; Rieske_2Fe-2S. DR InterPro; IPR036922; Rieske_2Fe-2S_sf. DR InterPro; IPR014349; Rieske_Fe-S_prot. DR InterPro; IPR005805; Rieske_Fe-S_prot_C. DR PANTHER; PTHR10134; CYTOCHROME B-C1 COMPLEX SUBUNIT RIESKE, MITOCHONDRIAL; 1. DR PANTHER; PTHR10134:SF50; CYTOCHROME B6-F COMPLEX IRON-SULFUR SUBUNIT, CHLOROPLASTIC; 1. DR Pfam; PF00355; Rieske; 1. DR PRINTS; PR00162; RIESKE. DR SUPFAM; SSF50022; ISP domain; 1. DR PROSITE; PS51296; RIESKE; 1. PE 3: Inferred from homology; KW 2Fe-2S; Disulfide bond; Electron transport; Iron; Iron-sulfur; Membrane; KW Metal-binding; Thylakoid; Translocase; Transmembrane; Transmembrane helix; KW Transport. FT CHAIN 1..179 FT /note="Cytochrome b6-f complex iron-sulfur subunit" FT /id="PRO_1000166187" FT TRANSMEM 21..43 FT /note="Helical" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01335" FT DOMAIN 61..162 FT /note="Rieske" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01335" FT BINDING 108 FT /ligand="[2Fe-2S] cluster" FT /ligand_id="ChEBI:CHEBI:190135" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01335" FT BINDING 110 FT /ligand="[2Fe-2S] cluster" FT /ligand_id="ChEBI:CHEBI:190135" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01335" FT BINDING 126 FT /ligand="[2Fe-2S] cluster" FT /ligand_id="ChEBI:CHEBI:190135" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01335" FT BINDING 129 FT /ligand="[2Fe-2S] cluster" FT /ligand_id="ChEBI:CHEBI:190135" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01335" FT DISULFID 113..128 FT /evidence="ECO:0000255|HAMAP-Rule:MF_01335" SQ SEQUENCE 179 AA; 19106 MW; CEB4DCD0AFFCD158 CRC64; MAQLSGTPDV PDMGRRQFMN LLTFGSATGV ALGMLYPVVR YFIPPASGGV GGGVVAKDAL GNDISVSDFL AKHPANDRAL AQGLKGDPTY IVVQDDHTIG DYGLNAVCTH LGCVVPWNIS ENKFICPCHG SQYDNTGKVV RGPAPLSLAL AHAAVSDDKI TFTPWTETDF RTGKEPWWT //