UniProtKB - P56321 (CYB6_CHLVU)
Protein
Cytochrome b6
Gene
petB
Organism
Chlorella vulgaris (Green alga)
Status
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
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
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 key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Binding sitei | 35 | Heme 1; covalent, via 1 linkUniRule annotation | 1 | |
Metal bindingi | 86 | Iron (heme 2 axial ligand)UniRule annotation | 1 | |
Metal bindingi | 100 | Iron (heme 1 axial ligand)UniRule annotation | 1 | |
Metal bindingi | 187 | Iron (heme 2 axial ligand)UniRule annotation | 1 | |
Metal bindingi | 202 | Iron (heme 1 axial ligand)UniRule annotation | 1 |
GO - Molecular functioni
- electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity Source: UniProtKB-UniRule
- metal ion binding Source: UniProtKB-KW
GO - Biological processi
- photosynthesis Source: UniProtKB-UniRule
- respiratory electron transport chain Source: InterPro
Keywordsi
Biological process | Electron transport, Photosynthesis, Transport |
Ligand | Heme, Iron, Metal-binding |
Names & Taxonomyi
Protein namesi | Recommended name: Cytochrome b6UniRule annotation |
Gene namesi | Name:petBUniRule annotation |
Encoded oni | Plastid; Chloroplast |
Organismi | Chlorella vulgaris (Green alga) |
Taxonomic identifieri | 3077 [NCBI] |
Taxonomic lineagei | Eukaryota › Viridiplantae › Chlorophyta › core chlorophytes › Trebouxiophyceae › Chlorellales › Chlorellaceae › Chlorella clade › Chlorella |
Subcellular locationi
Chloroplast
- chloroplast thylakoid membrane UniRule annotation; Multi-pass membrane protein UniRule annotation
Chloroplast
- chloroplast thylakoid membrane Source: UniProtKB-SubCell
Other locations
- integral component of membrane Source: UniProtKB-KW
Topology
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Transmembranei | 32 – 52 | HelicalUniRule annotationAdd BLAST | 21 | |
Transmembranei | 90 – 110 | HelicalUniRule annotationAdd BLAST | 21 | |
Transmembranei | 116 – 136 | HelicalUniRule annotationAdd BLAST | 21 | |
Transmembranei | 186 – 206 | HelicalUniRule annotationAdd BLAST | 21 |
Keywords - Cellular componenti
Chloroplast, Membrane, Plastid, ThylakoidPTM / Processingi
Molecule processing
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
ChainiPRO_0000061788 | 1 – 215 | Cytochrome b6Add BLAST | 215 |
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 annotationFamily & Domainsi
Sequence similaritiesi
Keywords - Domaini
Transmembrane, Transmembrane helixFamily and domain databases
CDDi | cd00284, Cytochrome_b_N, 1 hit |
Gene3Di | 1.20.810.10, 1 hit |
HAMAPi | MF_00633, Cytb6_f_cytb6, 1 hit |
InterProi | View protein in InterPro IPR005797, Cyt_b/b6_N IPR023530, Cyt_B6_PetB IPR027387, Cytb/b6-like_sf IPR016174, Di-haem_cyt_TM |
PANTHERi | PTHR19271:SF20, PTHR19271:SF20, 1 hit |
Pfami | View protein in Pfam PF00033, Cytochrome_B, 1 hit |
SUPFAMi | SSF81342, SSF81342, 1 hit |
PROSITEi | View protein in PROSITE PS51002, CYTB_NTER, 1 hit |
i Sequence
Sequence statusi: Complete.
P56321-1 [UniParc]FASTAAdd to basket
10 20 30 40 50
MGKVYDWFEE RLEIQSIADD ISSKYVPPHV NIFYCIGGIT FTCFLVQVAT
60 70 80 90 100
GFAMTFYYRP TVAEAFASVQ YIMTEVNFGW LIRSIHRWSA SMMVLMMILH
110 120 130 140 150
VCRVYLTGGF KKPRELTWVT GVIMAVCTVS FGVTGYSLPW DQIGYWAVKI
160 170 180 190 200
VTGVPDAIPV VGPALVELLR GGVGVGQSTL TRFYSLHTFV LPLATAVFML
210
MHFLMIRKQG ISGPL
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | AB001684 Genomic DNA Translation: BAA57914.1 |
PIRi | T07266 |
RefSeqi | NP_045838.1, NC_001865.1 |
Genome annotation databases
GeneIDi | 809116 |
Similar proteinsi
Cross-referencesi
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | AB001684 Genomic DNA Translation: BAA57914.1 |
PIRi | T07266 |
RefSeqi | NP_045838.1, NC_001865.1 |
3D structure databases
SMRi | P56321 |
ModBasei | Search... |
Genome annotation databases
GeneIDi | 809116 |
Family and domain databases
CDDi | cd00284, Cytochrome_b_N, 1 hit |
Gene3Di | 1.20.810.10, 1 hit |
HAMAPi | MF_00633, Cytb6_f_cytb6, 1 hit |
InterProi | View protein in InterPro IPR005797, Cyt_b/b6_N IPR023530, Cyt_B6_PetB IPR027387, Cytb/b6-like_sf IPR016174, Di-haem_cyt_TM |
PANTHERi | PTHR19271:SF20, PTHR19271:SF20, 1 hit |
Pfami | View protein in Pfam PF00033, Cytochrome_B, 1 hit |
SUPFAMi | SSF81342, SSF81342, 1 hit |
PROSITEi | View protein in PROSITE PS51002, CYTB_NTER, 1 hit |
ProtoNeti | Search... |
MobiDBi | Search... |
Entry informationi
Entry namei | CYB6_CHLVU | |
Accessioni | P56321Primary (citable) accession number: P56321 | |
Entry historyi | Integrated into UniProtKB/Swiss-Prot: | July 15, 1998 |
Last sequence update: | July 15, 1998 | |
Last modified: | April 7, 2021 | |
This is version 100 of the entry and version 1 of the sequence. See complete history. | ||
Entry statusi | Reviewed (UniProtKB/Swiss-Prot) | |
Annotation program | Plant Protein Annotation Program |