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Protein

Cytochrome b6

Gene

petB

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

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

heme2 PublicationsNote: Binds 2 heme groups. One heme group is bound covalently by a single cysteine link, the other one non-covalently.1 Publication

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Binding sitei35Heme 1 (covalent; via 1 link)1 Publication1
Metal bindingi86Iron (heme 2 axial ligand); via tele nitrogen1 Publication1
Metal bindingi100Iron (heme 1 axial ligand); via tele nitrogen1 Publication1
Metal bindingi187Iron (heme 2 axial ligand)1 Publication1
Metal bindingi202Iron (heme 1 axial ligand)1 Publication1

GO - Molecular functioni

GO - Biological processi

Keywordsi

Biological processElectron transport, Photosynthesis, Transport
LigandHeme, Iron, Metal-binding

Enzyme and pathway databases

BRENDAi1.10.9.1 7666

Names & Taxonomyi

Protein namesi
Recommended name:
Cytochrome b6UniRule annotation
Gene namesi
Name:petBUniRule annotation
OrganismiMastigocladus laminosus (Fischerella sp.)
Taxonomic identifieri83541 [NCBI]
Taxonomic lineageiBacteriaCyanobacteriaNostocalesHapalosiphonaceaeMastigocladus

Subcellular locationi

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Topological domaini1 – 31Cytoplasmic1 PublicationAdd BLAST31
Transmembranei32 – 52HelicalUniRule annotation1 PublicationAdd BLAST21
Topological domaini53 – 89Lumenal, thylakoid1 PublicationAdd BLAST37
Transmembranei90 – 110HelicalUniRule annotation1 PublicationAdd BLAST21
Topological domaini111 – 115Cytoplasmic1 Publication5
Transmembranei116 – 136HelicalUniRule annotation1 PublicationAdd BLAST21
Topological domaini137 – 185Lumenal, thylakoid1 PublicationAdd BLAST49
Transmembranei186 – 206HelicalUniRule annotation1 PublicationAdd BLAST21
Topological domaini207 – 215Cytoplasmic1 Publication9

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_00000618271 – 215Cytochrome b6Add BLAST215

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

1215
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

ProteinModelPortaliP83791
SMRiP83791
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiP83791

Family & Domainsi

Sequence similaritiesi

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

Keywords - Domaini

Transmembrane, Transmembrane helix

Family and domain databases

CDDicd00284 Cytochrome_b_N, 1 hit
Gene3Di1.20.810.10, 1 hit
HAMAPiMF_00633 Cytb6_f_cytb6, 1 hit
InterProiView protein in InterPro
IPR005797 Cyt_b/b6_N
IPR023530 Cyt_B6_PetB
IPR027387 Cytb/b6-like_sf
IPR016174 Di-haem_cyt_TM
PANTHERiPTHR19271:SF8 PTHR19271:SF8, 1 hit
PfamiView protein in Pfam
PF00033 Cytochrome_B, 1 hit
SUPFAMiSSF81342 SSF81342, 1 hit
PROSITEiView protein in PROSITE
PS51002 CYTB_NTER, 1 hit

Sequencei

Sequence statusi: Complete.

P83791-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MANVYDWFQE RLEIQALADD VTSKYVPPHV NIFYCLGGIT LTCFLIQFAT
60 70 80 90 100
GFAMTFYYKP TVTEAYASVQ YIMNEVSFGW LIRSIHRWSA SMMVLMMILH
110 120 130 140 150
VFRVYLTGGF KKPRELTWIS GVILAVITVS FGVTGYSLPW DQVGYWAVKI
160 170 180 190 200
VSGVPEAIPV VGVLISDLLR GGSSVGQATL TRYYSAHTFV LPWLIAVFML
210
LHFLMIRKQG ISGPL
Length:215
Mass (Da):24,227
Last modified:March 15, 2004 - v1
Checksum:i4FDCD9336CD31642
GO

Similar proteinsi

Cross-referencesi

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1VF5X-ray3.00A/N1-215[»]
2D2CX-ray3.80A/N1-215[»]
2E74X-ray3.00A1-215[»]
2E75X-ray3.55A1-215[»]
2E76X-ray3.41A1-215[»]
4H0LX-ray3.25A1-215[»]
4H13X-ray3.07A1-215[»]
4I7ZX-ray2.80A1-215[»]
4PV1X-ray3.00A1-215[»]
ProteinModelPortaliP83791
SMRiP83791
ModBaseiSearch...
MobiDBiSearch...

Chemistry databases

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

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Enzyme and pathway databases

BRENDAi1.10.9.1 7666

Miscellaneous databases

EvolutionaryTraceiP83791

Family and domain databases

CDDicd00284 Cytochrome_b_N, 1 hit
Gene3Di1.20.810.10, 1 hit
HAMAPiMF_00633 Cytb6_f_cytb6, 1 hit
InterProiView protein in InterPro
IPR005797 Cyt_b/b6_N
IPR023530 Cyt_B6_PetB
IPR027387 Cytb/b6-like_sf
IPR016174 Di-haem_cyt_TM
PANTHERiPTHR19271:SF8 PTHR19271:SF8, 1 hit
PfamiView protein in Pfam
PF00033 Cytochrome_B, 1 hit
SUPFAMiSSF81342 SSF81342, 1 hit
PROSITEiView protein in PROSITE
PS51002 CYTB_NTER, 1 hit
ProtoNetiSearch...

Entry informationi

Entry nameiCYB6_MASLA
AccessioniPrimary (citable) accession number: P83791
Entry historyiIntegrated into UniProtKB/Swiss-Prot: April 13, 2004
Last sequence update: March 15, 2004
Last modified: October 10, 2018
This is version 87 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

3D-structure

Documents

  1. SIMILARITY comments
    Index of protein domains and families
  2. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
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