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Protein

Cytochrome b6-f complex iron-sulfur subunit

Gene

petC

Organism
Mastigocladus laminosus (Fischerella sp.)
Status
Reviewed-Annotation score: -Experimental evidence at protein 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.1 Publication

Miscellaneous

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] cluster1 PublicationNote: Binds 1 [2Fe-2S] cluster per subunit.1 Publication

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Metal bindingi108Iron-sulfur (2Fe-2S)1 Publication1
Metal bindingi110Iron-sulfur (2Fe-2S); via pros nitrogen1 Publication1
Metal bindingi126Iron-sulfur (2Fe-2S)1 Publication1
Metal bindingi129Iron-sulfur (2Fe-2S); via pros nitrogen1 Publication1

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 (EC:1.10.9.1)
Alternative name(s):
Plastohydroquinone:plastocyanin oxidoreductase iron-sulfur protein
Short name:
ISP1 Publication
Short name:
RISP
Rieske iron-sulfur protein
Gene namesi
Name:petC
OrganismiMastigocladus laminosus (Fischerella sp.)
Taxonomic identifieri83541 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaNostocalesHapalosiphonaceaeMastigocladus

Subcellular locationi

  • Cellular thylakoid membrane 1 Publication; Single-pass membrane protein 1 Publication
  • Note: The transmembrane helix obliquely spans the membrane in one monomer, and its extrinsic C-terminal domain is part of the other monomer (PubMed:14526088).1 Publication

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Topological domaini1 – 20Cytoplasmic1 PublicationAdd BLAST20
Transmembranei21 – 43Helical1 PublicationAdd BLAST23
Topological domaini44 – 179Lumenal, thylakoid1 PublicationAdd BLAST136

GO - Cellular componenti

Keywords - Cellular componenti

Membrane, Thylakoid

Pathology & Biotechi

Chemistry databases

DrugBankiDB08453 2-NONYL-4-HYDROXYQUINOLINE N-OXIDE
DB04646 Dibromothymoquinone

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001277751 – 179Cytochrome b6-f complex iron-sulfur subunitAdd BLAST179

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Disulfide bondi113 ↔ 1281 Publication

Keywords - PTMi

Disulfide bond

Proteomic databases

PRIDEiP83794

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.1 Publication

Structurei

Secondary structure

1179
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi13 – 42Combined sources30
Beta strandi59 – 62Combined sources4
Helixi66 – 71Combined sources6
Beta strandi80 – 82Combined sources3
Beta strandi84 – 87Combined sources4
Beta strandi88 – 91Combined sources4
Beta strandi97 – 99Combined sources3
Beta strandi101 – 105Combined sources5
Turni109 – 111Combined sources3
Beta strandi119 – 125Combined sources7
Turni127 – 129Combined sources3
Beta strandi131 – 133Combined sources3
Beta strandi135 – 137Combined sources3
Beta strandi141 – 143Combined sources3
Beta strandi150 – 154Combined sources5
Beta strandi156 – 159Combined sources4
Beta strandi161 – 164Combined sources4
Turni170 – 172Combined sources3

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1VF5X-ray3.00D/Q1-179[»]
2D2CX-ray3.80D/Q1-179[»]
2E74X-ray3.00D1-179[»]
2E75X-ray3.55D1-179[»]
2E76X-ray3.41D1-179[»]
4H0LX-ray3.25D1-179[»]
4H13X-ray3.07D1-179[»]
4I7ZX-ray2.80D1-179[»]
4PV1X-ray3.00D1-179[»]
ProteinModelPortaliP83794
SMRiP83794
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiP83794

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini61 – 162Rieske1 PublicationAdd BLAST102

Keywords - Domaini

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
IPR036922 Rieske_2Fe-2S_sf
IPR014349 Rieske_Fe-S_prot
IPR005805 Rieske_Fe-S_prot_C
PANTHERiPTHR10134 PTHR10134, 1 hit
PTHR10134:SF5 PTHR10134:SF5, 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.

P83794-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MAQFTESMDV PDMGRRQFMN LLAFGTVTGV ALGALYPLVK YFIPPSGGAV
60 70 80 90 100
GGGTTAKDKL GNNVKVSKFL ESHNAGDRVL VQGLKGDPTY IVVESKEAIR
110 120 130 140 150
DYGINAVCTH LGCVVPWNAA ENKFKCPCHG SQYDETGKVI RGPAPLSLAL
160 170
CHATVQDDNI VLTPWTETDF RTGEKPWWV
Length:179
Mass (Da):19,401
Last modified:June 21, 2005 - v2
Checksum:i3797DC66C5AFAD6C
GO

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sequence conflicti138K → R (PubMed:14526088).Curated1

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AY390356 Genomic DNA Translation: AAR26240.1

Similar proteinsi

Entry informationi

Entry nameiUCRI_MASLA
AccessioniPrimary (citable) accession number: P83794
Secondary accession number(s): Q5YJJ8
Entry historyiIntegrated into UniProtKB/Swiss-Prot: May 10, 2004
Last sequence update: June 21, 2005
Last modified: May 23, 2018
This is version 94 of the entry and version 2 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

3D-structure

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