| Type: | Family | Name: | HNS-dependent expression A/B |
| Description: | HNS (histone-like nucleoid structuring)-dependent expression A (HdeA) protein is a stress response protein found in highly acid resistant bacteria such as Shigella flexneriand Escherichia coli, but which is lacking in mildly acid tolerant bacteria such as Salmonella []. HdeA is one of the most abundant proteins found in the periplasmic space of E. coli, where it is one of a network of proteins that confer an acid resistance phenotype essential for the pathogenesis of enteric bacteria []. HdeA is thought to act as a chaperone, functioning to prevent the aggregation of periplasmic proteins denatured under acidic conditions. The HNS protein, a chromatin-associated protein that influences the gene expression of several environmentally-induced target genes, represses the expression of HdeA. HdeB, which is encoded within the same operon, may form heterodimers with HdeA. HdeA is a single domain alpha-helical [] protein with an overall fold that is similar to the fold of the N-terminal subdomain of the GluRS anticodon-binding domain. This entry represents HdeA and HdeB which are also known as acid stress chaperones. | Short Name: | HNS-dep_expression_A/B |
