The novel Hha/YmoA family of nucleoid-associated proteins: use of structural mimicry to modulate the activity of the H-NS family of proteins

Mol Microbiol. 2007 Jan;63(1):7-14. doi: 10.1111/j.1365-2958.2006.05497.x. Epub 2006 Nov 14.


The Hha/YmoA family of proteins is a group of conserved, low-molecular-weight proteins involved in the regulation of gene expression. Studies performed in Escherichia coli, Salmonella sp. and Yersinia sp. highlight the contribution of these proteins in regulating bacterial virulence, horizontal gene transfer and cell physiology. Genes encoding such proteins are located on chromosomes and plasmids in different genera of Gram-negative bacteria. Their mode of action is currently being analysed by studying direct binding of Hha to DNA and as a component of protein complexes with regulatory functions. Recent data on the interaction of Hha with the H-NS family of proteins and structural information suggest a physiological role for such protein complexes in many aspects of gene regulation.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Bacterial Proteins / metabolism*
  • DNA-Binding Proteins / chemistry*
  • DNA-Binding Proteins / metabolism*
  • Enterobacteriaceae / metabolism*
  • Escherichia coli Proteins
  • Gene Expression Regulation, Bacterial


  • Bacterial Proteins
  • DNA-Binding Proteins
  • Escherichia coli Proteins
  • H-NS protein, bacteria
  • YmoA protein, Yersinia enterocolitica