SUPERFAMILY 1.75 HMM library and genome assignments server

Hemolysin expression modulating protein HHA superfamily

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   All alpha proteins [ 46456] (284)
Fold:   Open three-helical up-and-down bundle [ 47143] (7)
Superfamily:   Hemolysin expression modulating protein HHA [ 68989]
Families:   Hemolysin expression modulating protein HHA [ 68990]

Superfamily statistics
Genomes (223) Uniprot 2013_05 PDB chains (SCOP 1.75)
Domains 509 3,424 1
Proteins 509 3,424 1

Functional annotation
General category Regulation
Detailed category Other regulatory function

Function annotation of SCOP domain superfamilies

InterPro annotation
Cross references IPR007985 SSF68989 Protein matches

This family consists of haemolysin expression modulating protein (Hha) from Escherichia coli and its enterobacterial homologues, such as YmoA from Yersinia enterocolitica, and RmoA encoded on the R100 plasmid. These proteins act as modulators of bacterial gene expression. Members of the Hha/YmoA/RmoA family act in conjunction with members of the H-NS family, participating in the thermoregulation of different virulence factors and in plasmid transfer [PubMed11890540]. Hha, along with the chromatin-associated protein H-NS, is involved in the regulation of expression of the toxin alpha-haemolysin in response to osmolarity and temperature [PubMed11790731]. YmoA modulates the expression of various virulence factors, such as Yop proteins and YadA adhesin, in response to temperature. RmoA is a plasmid R100 modulator involved in plasmid transfer [PubMed9851035]. The HHA family of proteins display striking similarity to the oligomerization domain of the H-NS proteins.

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 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 Hemolysin expression modulating protein HHA 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 Hemolysin expression modulating protein HHA 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 ]