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Protein

Cytochrome b6-f complex iron-sulfur subunit, chloroplastic

Gene

petC

Organism
Fritillaria agrestis (Stinkbells)
Status
Reviewed-Annotation score: Annotation score: 3 out of 5-Experimental evidence at transcript leveli

Functioni

Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions.By similarity

Miscellaneous

This protein is 1 of 2 subunits of the cytochrome b6-f complex that are encoded in the nucleus.
The Rieske iron-sulfur protein is a high potential 2Fe-2S protein.

Catalytic activityi

Plastoquinol + 2 oxidized plastocyanin + 2 H+(Side 1) = plastoquinone + 2 reduced plastocyanin + 4 H+(Side 2).

Cofactori

[2Fe-2S] clusterBy similarityNote: Binds 1 [2Fe-2S] cluster per subunit.By similarity

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Metal bindingi158Iron-sulfur (2Fe-2S)By similarity1
Metal bindingi160Iron-sulfur (2Fe-2S); via pros nitrogenBy similarity1
Metal bindingi176Iron-sulfur (2Fe-2S)By similarity1
Metal bindingi179Iron-sulfur (2Fe-2S); via pros nitrogenBy similarity1

GO - Molecular functioni

GO - Biological processi

Keywordsi

Molecular functionOxidoreductase
Biological processElectron transport, Transport
Ligand2Fe-2S, Iron, Iron-sulfur, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Cytochrome b6-f complex iron-sulfur subunit, chloroplastic (EC:1.10.9.1)
Alternative name(s):
Plastohydroquinone:plastocyanin oxidoreductase iron-sulfur protein
Rieske iron-sulfur protein
Short name:
ISP
Short name:
RISP
Gene namesi
Name:petC
OrganismiFritillaria agrestis (Stinkbells)
Taxonomic identifieri64177 [NCBI]
Taxonomic lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliophytaLiliopsidaLilialesLiliaceaeFritillaria

Subcellular locationi

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei73 – 93HelicalSequence analysisAdd BLAST21

GO - Cellular componenti

Keywords - Cellular componenti

Chloroplast, Membrane, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transit peptidei1 – 56ChloroplastSequence analysisAdd BLAST56
ChainiPRO_000003068957 – 230Cytochrome b6-f complex iron-sulfur subunit, chloroplasticAdd BLAST174

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Disulfide bondi163 ↔ 178By similarity

Keywords - PTMi

Disulfide bond

Interactioni

Subunit structurei

The 4 large subunits of the cytochrome b6-f complex are cytochrome b6, subunit IV (17 kDa polypeptide, petD), cytochrome f and the Rieske protein, while the 4 small subunits are petG, petL, petM and petN. The complex functions as a dimer (By similarity).By similarity

Structurei

3D structure databases

ProteinModelPortaliO49078.
SMRiO49078.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini116 – 212RieskeAdd BLAST97

Keywords - Domaini

Transit peptide, Transmembrane, Transmembrane helix

Family and domain databases

Gene3Di2.102.10.10. 1 hit.
HAMAPiMF_01335. Cytb6_f_Rieske. 1 hit.
InterProiView protein in InterPro
IPR014909. Cyt_b6-f_cplx_Fe-S_su.
IPR023960. Cyt_b6_f_Rieske.
IPR017941. Rieske_2Fe-2S.
IPR014349. Rieske_Fe-S_prot.
IPR005805. Rieske_Fe-S_prot_C.
PANTHERiPTHR10134. PTHR10134. 1 hit.
PTHR10134:SF11. PTHR10134:SF11. 1 hit.
PfamiView protein in Pfam
PF08802. CytB6-F_Fe-S. 1 hit.
PF00355. Rieske. 1 hit.
PRINTSiPR00162. RIESKE.
SUPFAMiSSF50022. SSF50022. 1 hit.
PROSITEiView protein in PROSITE
PS51296. RIESKE. 1 hit.

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

O49078-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MASTTLSATP TPSQLSAAKN GAYSPSRALL GKTARGLYPE KEMVSRKVTC
60 70 80 90 100
QATSIPADRV PDMGKRQTMN LLLLGALSLP TAGMLIPYGA FFVPPSSGGG
110 120 130 140 150
GGGIVAKDAV GNDIVAAAWL KTHGPGDRTL AQGLRGDPTY LVVENDRSLA
160 170 180 190 200
TYGINAVCTH LGCVVPWNKA ENKFLCPCHG SQYNNQGKVV RGPAPLSLAL
210 220 230
SHCDISEEGK VVFVPWVETD FRTGENPWWS
Length:230
Mass (Da):24,298
Last modified:June 1, 1998 - v1
Checksum:iD1B914F0049AF51E
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF037456 mRNA. Translation: AAC04807.1.

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.

Entry informationi

Entry nameiUCRIA_FRIAG
AccessioniPrimary (citable) accession number: O49078
Entry historyiIntegrated into UniProtKB/Swiss-Prot: July 5, 2005
Last sequence update: June 1, 1998
Last modified: May 10, 2017
This is version 89 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program