SUPERFAMILY 1.75 HMM library and genome assignments server

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OmpH-like superfamily

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   Membrane and cell surface proteins and peptides [ 56835] (58)
Fold:   OmpH-like [ 111383]
Superfamily:   OmpH-like [ 111384]
Families:   OmpH-like [ 111385]

Superfamily statistics
Genomes (1,273) Uniprot 2018_03 genome PDB chains (SCOP 1.75)
Domains 1,598 15,234 2
Proteins 1,583 15,168 2

Functional annotation
General category coiled coil
Detailed category This is a complex coiled arrangement. The details of which will appear on this page shortly (some coiled coil details are being checked before they are included on the site). If you want to see examples of the states please click here here. If you require further details urgently please contact Owen Rackham

Function annotation of SCOP domain superfamilies

InterPro annotation
Cross references IPR005632 SSF111384 Protein matches

This family contains proteins annotated as OmpH (outer membrane protein H). OmpH is a major structural protein of the outer membrane. In Pasteurella multocida it acts as a channel-forming transmembrane porin [PubMed9401047]. Porins act as molecular sieves to allow the diffusion of small hydrophilic solutes through the outer membrane and also acts as a receptor for bacteriophages and bacteriocins. Porins are highly immunogenic and are conserved in bacterial families, making them attractive vaccine candidates [PubMed10067687].

The 17-kDa protein (Skp, OmpH) of Escherichia coli is a homotrimeric periplasmic chaperone for newly synthesised outer-membrane proteins, the X-ray structure of which has been reported at resolutions of 2.35 A and 2.30 A [PubMed15361861, PubMed15304217]. Three hairpin-shaped alpha-helical extensions reach out by approximately 60 A from a trimerisation domain, which is composed of three intersubunit beta-sheets that wind around a central axis. The alpha-helical extensions approach each other at their distal turns, resulting in a fold that resembles a 'three-pronged grasping forcep'. The overall shape of Skp is reminiscent of the cytosolic chaperone prefoldin , although it is based on a radically different topology. The peculiar architecture, with apparent plasticity of the prongs and distinct electrostatic and hydrophobic surface properties, supports the recently proposed biochemical mechanism of this chaperone: formation of a Skp(3)-Omp complex protects the outer membrane protein from aggregation during passage through the bacterial periplasm.

The ability of Skp to prevent the aggregation of model substrates in vitro is independent of ATP. Skp can interact directly with membrane lipids and lipopolysaccharide. These interactions are needed for efficient Skp-assisted folding of membrane proteins [PubMed15304217].

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 ]

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 1 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 OmpH-like 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 1 hidden Markov models representing the OmpH-like 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 ]