SUPERFAMILY 1.75 HMM library and genome assignments server

Ectatomin subunits superfamily

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   All alpha proteins [ 46456] (284)
Fold:   Ectatomin subunits [ 47400]
Superfamily:   Ectatomin subunits [ 47401]
Families:   Ectatomin subunits [ 47402] (2)

Superfamily statistics
Genomes (0) Uniprot 2013_05 PDB chains (SCOP 1.75)
Domains 0 2 2
Proteins 0 2 2

Functional annotation
General category Processes_EC
Detailed category Toxins/defense

Function annotation of SCOP domain superfamilies

InterPro annotation
Cross references IPR009458 SSF47401 Protein matches

Ectatomin is a toxin from the venom of the ant Ectatomma tuberculatum. Ectatomin can efficiently insert into the plasma membrane, where it can form channels. Ectatomin was shown to inhibit L-type calcium currents in isolated rat cardiac myocytes [PubMed10336635]. In these cells, ectatomin induces a gradual, irreversible increase in ion leakage across the membrane, which can lead to cell death.

Ectatomin is comprised of two subunits, A and B, which are homologous. The structure of ectatomin reveals that each subunit consists of two alpha helices with a connecting hinge region, which form a hairpin structure that is stabilised by disulphide bridges. A disulphide bridge between the hinge regions of the two subunits links the heterodimer together, forming a closed bundle of four helices with a left-handed twist [PubMed7881269].

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

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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 Ectatomin subunits 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 Ectatomin subunits 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 · Internal database links ]