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Protein

Cytochrome b6

Gene

petB

Organism
Arabidopsis thaliana (Mouse-ear cress)
Status
Reviewed-Annotation score: Annotation score: 3 out of 5-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.UniRule annotation

Cofactori

hemeUniRule annotationNote: Binds 2 heme groups. One heme group is bound covalently by a single cysteine link, the other one non-covalently.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Binding sitei35Heme 1 (covalent; via 1 link)UniRule annotation1
Metal bindingi86Iron (heme 2 axial ligand)UniRule annotation1
Metal bindingi100Iron (heme 1 axial ligand)UniRule annotation1
Metal bindingi187Iron (heme 2 axial ligand)UniRule annotation1
Metal bindingi202Iron (heme 1 axial ligand)UniRule annotation1

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Biological processi

Electron transport, Photosynthesis, Transport

Keywords - Ligandi

Heme, Iron, Metal-binding

Enzyme and pathway databases

BioCyciARA:GQT-2101-MONOMER.

Protein family/group databases

TCDBi3.D.3.5.2. the proton-translocating quinol:cytochrome c reductase (qcr) superfamily.

Names & Taxonomyi

Protein namesi
Recommended name:
Cytochrome b6UniRule annotation
Gene namesi
Name:petBUniRule annotation
Ordered Locus Names:AtCg00720
Encoded oniPlastid; Chloroplast
OrganismiArabidopsis thaliana (Mouse-ear cress)
Taxonomic identifieri3702 [NCBI]
Taxonomic lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliophytaeudicotyledonsGunneridaePentapetalaerosidsmalvidsBrassicalesBrassicaceaeCamelineaeArabidopsis
Proteomesi
  • UP000006548 Componenti: Chloroplast

Organism-specific databases

TAIRiATCG00720.

Subcellular locationi

  • Plastidchloroplast thylakoid membrane UniRule annotation; Multi-pass membrane protein UniRule annotation

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei32 – 52HelicalUniRule annotationAdd BLAST21
Transmembranei90 – 110HelicalUniRule annotationAdd BLAST21
Transmembranei116 – 136HelicalUniRule annotationAdd BLAST21
Transmembranei186 – 206HelicalUniRule annotationAdd BLAST21

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Chloroplast, Membrane, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00000617821 – 215Cytochrome b6Add BLAST215

Proteomic databases

PaxDbiP56773.
PRIDEiP56773.

Expressioni

Gene expression databases

GenevisibleiP56773. AT.

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.UniRule annotation

Protein-protein interaction databases

BioGridi29935. 2 interactors.
IntActiP56773. 2 interactors.
STRINGi3702.ATCG00720.1.

Structurei

3D structure databases

ProteinModelPortaliP56773.
SMRiP56773.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the cytochrome b family. PetB subfamily.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiKOG4663. Eukaryota.
COG1290. LUCA.
HOGENOMiHOG000086791.
InParanoidiP56773.
KOiK02635.
OMAiLHFLMIR.
OrthoDBiEOG09360KF2.

Family and domain databases

CDDicd00284. Cytochrome_b_N. 1 hit.
Gene3Di1.20.810.10. 1 hit.
HAMAPiMF_00633. Cytb6_f_cytb6. 1 hit.
InterProiIPR005797. Cyt_b/b6_N.
IPR023530. Cyt_B6_PetB.
IPR027387. Cytb/b6-like.
IPR016174. Di-haem_cyt_TM.
[Graphical view]
PfamiPF00033. Cytochrome_B. 1 hit.
[Graphical view]
PIRSFiPIRSF000032. Cytochrome_b6. 1 hit.
SUPFAMiSSF81342. SSF81342. 1 hit.
PROSITEiPS51002. CYTB_NTER. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

P56773-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MSKVYDWFEE RLEIQAIADD ITSKYVPPHV NIFYCLGGIT LTCFLVQVAT
60 70 80 90 100
GFAMTFYYRP TVTEAFASVQ YIMTEANFGW LIRSVHRWSA SMMVLMMILH
110 120 130 140 150
VFRVYLTGGF KKPRELTWVT GVVLGVLTAS FGVTGYSLPW DQIGYWAVKI
160 170 180 190 200
VTGVPDAIPV IGSPLVELLR GSASVGQSTL TRFYSLHTFV LPLLTAVFML
210
MHFLMIRKQG ISGPL
Length:215
Mass (Da):24,153
Last modified:May 30, 2000 - v1
Checksum:i1F439CBC29F5B46C
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AP000423 Genomic DNA. Translation: BAA84415.1.
RefSeqiNP_051088.1. NC_000932.1.

Genome annotation databases

EnsemblPlantsiATCG00720.1; ATCG00720.1; ATCG00720.
GeneIDi844729.
GrameneiATCG00720.1; ATCG00720.1; ATCG00720.
KEGGiath:ArthCp053.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AP000423 Genomic DNA. Translation: BAA84415.1.
RefSeqiNP_051088.1. NC_000932.1.

3D structure databases

ProteinModelPortaliP56773.
SMRiP56773.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

BioGridi29935. 2 interactors.
IntActiP56773. 2 interactors.
STRINGi3702.ATCG00720.1.

Protein family/group databases

TCDBi3.D.3.5.2. the proton-translocating quinol:cytochrome c reductase (qcr) superfamily.

Proteomic databases

PaxDbiP56773.
PRIDEiP56773.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblPlantsiATCG00720.1; ATCG00720.1; ATCG00720.
GeneIDi844729.
GrameneiATCG00720.1; ATCG00720.1; ATCG00720.
KEGGiath:ArthCp053.

Organism-specific databases

TAIRiATCG00720.

Phylogenomic databases

eggNOGiKOG4663. Eukaryota.
COG1290. LUCA.
HOGENOMiHOG000086791.
InParanoidiP56773.
KOiK02635.
OMAiLHFLMIR.
OrthoDBiEOG09360KF2.

Enzyme and pathway databases

BioCyciARA:GQT-2101-MONOMER.

Miscellaneous databases

PROiP56773.

Gene expression databases

GenevisibleiP56773. AT.

Family and domain databases

CDDicd00284. Cytochrome_b_N. 1 hit.
Gene3Di1.20.810.10. 1 hit.
HAMAPiMF_00633. Cytb6_f_cytb6. 1 hit.
InterProiIPR005797. Cyt_b/b6_N.
IPR023530. Cyt_B6_PetB.
IPR027387. Cytb/b6-like.
IPR016174. Di-haem_cyt_TM.
[Graphical view]
PfamiPF00033. Cytochrome_B. 1 hit.
[Graphical view]
PIRSFiPIRSF000032. Cytochrome_b6. 1 hit.
SUPFAMiSSF81342. SSF81342. 1 hit.
PROSITEiPS51002. CYTB_NTER. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiCYB6_ARATH
AccessioniPrimary (citable) accession number: P56773
Entry historyi
Integrated into UniProtKB/Swiss-Prot: May 30, 2000
Last sequence update: May 30, 2000
Last modified: November 2, 2016
This is version 114 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program

Miscellaneousi

Miscellaneous

Heme 1 (or BH or b566) is high-potential and absorbs at about 566 nm, and heme 2 (or BL or b562) is low-potential and absorbs at about 562 nm.UniRule annotation

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. Arabidopsis thaliana
    Arabidopsis thaliana: entries and gene names
  2. SIMILARITY comments
    Index of protein domains and families

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.