SUPERFAMILY 1.75 HMM library and genome assignments server

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PetG subunit of the cytochrome b6f complex superfamily

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   Membrane and cell surface proteins and peptides [ 56835] (58)
Fold:   Single transmembrane helix [ 81407] (38)
Superfamily:   PetG subunit of the cytochrome b6f complex [ 103446]
Families:   PetG subunit of the cytochrome b6f complex [ 103447]

Superfamily statistics
Genomes (79) Uniprot 2014_06 PDB chains (SCOP 1.75)
Domains 97 1,030 2
Proteins 95 1,030 2

Functional annotation
General category Metabolism
Detailed category E- transfer

Function annotation of SCOP domain superfamilies

UniProtKB KeyWords (KW)

(show details)
KW termFDR (all)SDKW levelAnnotation (direct or inherited)
Biological processTransport0Least InformativeDirect
Biological processElectron transport0InformativeDirect
Biological processPhotosynthesis0InformativeDirect
Cellular componentMembrane0Least InformativeDirect
Cellular componentPlastid0Moderately InformativeDirect
Cellular componentThylakoid0InformativeDirect
DomainTransmembrane0Least InformativeDirect

Document: KW annotation of SCOP domains

InterPro annotation
Cross references IPR003683 SSF103446 Protein matches

This family consists of cytochrome b6/f complex subunit 5 (PetG). The cytochrome bf complex found in green plants, eukaryotic algae and cyanobacteria, connects photosystem I to photosystem II in the electron transport chain, functioning as a plastoquinol:plastocyanin/cytochrome c6 oxidoreductase [PubMed7493961]. The purified complex from the unicellular alga Chlamydomonas reinhardtii contains seven subunits; namely four high molecular weight subunits (cytochrome f, Rieske iron-sulphur protein, cytochrome b6, and subunit IV) and three approximately miniproteins (PetG, PetL, and PetX) [PubMed7493968]. Stoichiometry measurements are consistent with every subunit being present as two copies per b6/f dimer. The absence of PetG affects either the assembly or stability of the cytochrome bf complex in Chlamydomonas reinhardtii [PubMed7493961].

InterPro database

PDBeMotif information about ligands, sequence and structure motifs
Cross references PDB entries
Ligand binding statistics
Nucleic-acid binding statistics
Occurrence of secondary structure elements
Occurrence of small 3D structural motifs

PDBeMotif resource

Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · UniProtKB KeyWords (KW) ]

Internal database links

Browse genome assignments for this superfamily. The SUPERFAMILY hidden Markov model library has been used to carry out SCOP domain assignments to all genomes at the superfamily level.

Alignments of sequences to 2 models in this superfamily are available by clicking on the 'Alignments' icon above. PDB sequences less than 40% identical are shown by default, but any other sequence(s) may be aligned. Select PDB sequences, genome sequences, or paste in or upload your own sequences.

Browse and view proteins in genomes which have different domain combinations including a PetG subunit of the cytochrome b6f complex domain.

Examine the distribution of domain superfamilies, or families, across the major taxonomic kingdoms or genomes within a kingdom. This gives an immediate impression of how superfamilies, or families, are restricted to certain kingdoms of life.

Explore domain occurrence network where nodes represent genomes and edges are domain architectures (shared between genomes) containing the superfamily of interest.

There are 2 hidden Markov models representing the PetG subunit of the cytochrome b6f complex superfamily. Information on how the models are built, and plots showing hydrophobicity, match emmission probabilities and insertion/deletion probabilities can be inspected.

Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · UniProtKB KeyWords (KW) · Internal database links ]