ID   UCRI_MASLA              Reviewed;         179 AA.
AC   P83794; Q5YJJ8;
DT   10-MAY-2004, integrated into UniProtKB/Swiss-Prot.
DT   21-JUN-2005, sequence version 2.
DT   16-DEC-2008, entry version 45.
DE   RecName: Full=Cytochrome b6-f complex iron-sulfur subunit;
DE            EC=1.10.99.1;
DE   AltName: Full=Rieske iron-sulfur protein;
DE   AltName: Full=Plastohydroquinone:plastocyanin oxidoreductase iron-sulfur protein;
DE            Short=ISP;
DE            Short=RISP;
GN   Name=petC;
OS   Mastigocladus laminosus (Fischerella sp.).
OC   Bacteria; Cyanobacteria; Stigonematales; Mastigocladus.
OX   NCBI_TaxID=83541;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA   Yan J., Zhang H., Cramer W.A.;
RT   "Cloning and characterization of the petBD and petCA operon from the
RT   thermophilic cyanobacterium Mastigocladus laminosus.";
RL   Submitted (SEP-2003) to the EMBL/GenBank/DDBJ databases.
RN   [2]
RP   X-RAY CRYSTALLOGRAPHY (3.0 ANGSTROMS).
RX   PubMed=14526088; DOI=10.1126/science.1090165;
RA   Kurisu G., Zhang H., Smith J.L., Cramer W.A.;
RT   "Structure of the cytochrome b6f complex of oxygenic photosynthesis:
RT   tuning the cavity.";
RL   Science 302:1009-1014(2003).
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   -!- CATALYTIC ACTIVITY: Plastoquinol-1 + 2 oxidized plastocyanin =
CC       plastoquinone + 2 reduced plastocyanin.
CC   -!- COFACTOR: Binds 1 2Fe-2S cluster per subunit.
CC   -!- SUBUNIT: The 4 large subunits of the cytochrome b6-f complex are
CC       cytochrome b6, subunit IV (17 kDa polypeptide, petD), cytochrome f
CC       and the Rieske protein, while the 4 small subunits are petG, petL,
CC       petM and petN. The complex functions as a dimer.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane; Single-pass
CC       membrane protein (By similarity). Note=The transmembrane helix
CC       obliquely spans the membrane in one monomer, and its extrinsic C-
CC       terminal domain is part of the other monomer.
CC   -!- MISCELLANEOUS: The Rieske iron-sulfur protein is a high potential
CC       2Fe-2S protein.
CC   -!- SIMILARITY: Contains 1 Rieske domain.
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DR   EMBL; AY390356; AAR26240.1; -; Genomic_DNA.
DR   PDB; 1VF5; X-ray; 3.00 A; D/Q=1-179.
DR   PDB; 2D2C; X-ray; 3.80 A; D/Q=1-179.
DR   PDB; 2E74; X-ray; 3.00 A; D=1-179.
DR   PDB; 2E75; X-ray; 3.55 A; D=1-179.
DR   PDB; 2E76; X-ray; 3.41 A; D=1-179.
DR   PDBsum; 1VF5; -.
DR   PDBsum; 2D2C; -.
DR   PDBsum; 2E74; -.
DR   PDBsum; 2E75; -.
DR   PDBsum; 2E76; -.
DR   GO; GO:0016021; C:integral to membrane; IEA:UniProtKB-KW.
DR   GO; GO:0042651; C:thylakoid membrane; IEA:InterPro.
DR   GO; GO:0051537; F:2 iron, 2 sulfur cluster binding; IEA:InterPro.
DR   GO; GO:0045158; F:electron transporter, transferring electron...; IEA:HAMAP.
DR   GO; GO:0005506; F:iron ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0009496; F:plastoquinol-plastocyanin reductase activity; IEA:HAMAP.
DR   GO; GO:0022900; P:electron transport chain; IEA:UniProtKB-KW.
DR   GO; GO:0015979; P:photosynthesis; IEA:HAMAP.
DR   GO; GO:0006810; P:transport; IEA:UniProtKB-KW.
DR   HAMAP; MF_01335; -; 1.
DR   InterPro; IPR014909; Cyt_b6-F_Fe-S_su.
DR   InterPro; IPR014349; Rieske.
DR   InterPro; IPR005805; Rieske_C.
DR   InterPro; IPR005806; Rieske_reg.
DR   Gene3D; G3DSA:2.102.10.10; Rieske_reg; 1.
DR   PANTHER; PTHR10134; Rieske; 1.
DR   Pfam; PF08802; CytB6-F_Fe-S; 1.
DR   Pfam; PF00355; Rieske; 1.
DR   PRINTS; PR00162; RIESKE.
DR   PROSITE; PS51296; RIESKE; 1.
PE   1: Evidence at protein level;
KW   2Fe-2S; 3D-structure; Electron transport; Iron; Iron-sulfur; Membrane;
KW   Metal-binding; Oxidoreductase; Thylakoid; Transmembrane; Transport.
FT   CHAIN         1    179       Cytochrome b6-f complex iron-sulfur
FT                                subunit.
FT                                /FTId=PRO_0000127775.
FT   TRANSMEM     21     43
FT   DOMAIN       61    162       Rieske.
FT   METAL       108    108       Iron-sulfur (2Fe-2S).
FT   METAL       110    110       Iron-sulfur (2Fe-2S); via pros nitrogen.
FT   METAL       126    126       Iron-sulfur (2Fe-2S).
FT   METAL       129    129       Iron-sulfur (2Fe-2S); via pros nitrogen.
FT   DISULFID    113    128
FT   CONFLICT    138    138       K -> R (in Ref. 2).
FT   HELIX        23     42
FT   HELIX        66     71
FT   STRAND       80     82
FT   STRAND       84     87
FT   TURN        109    111
FT   STRAND      119    125
FT   TURN        127    129
FT   STRAND      135    137
FT   STRAND      141    143
FT   STRAND      156    159
FT   TURN        170    172
SQ   SEQUENCE   179 AA;  19401 MW;  3797DC66C5AFAD6C CRC64;
     MAQFTESMDV PDMGRRQFMN LLAFGTVTGV ALGALYPLVK YFIPPSGGAV GGGTTAKDKL
     GNNVKVSKFL ESHNAGDRVL VQGLKGDPTY IVVESKEAIR DYGINAVCTH LGCVVPWNAA
     ENKFKCPCHG SQYDETGKVI RGPAPLSLAL CHATVQDDNI VLTPWTETDF RTGEKPWWV
//