Send to

Choose Destination
J Biol Chem. 2001 Jun 15;276(24):20866-75. Epub 2001 Mar 23.

Characterization of the Escherichia coli sigma E regulon.

Author information

Departement de Biochimie Médicale, Centre Médical Universitaire, Université de Genève, 1 Rue Michel Servet, 1211 Geneva 4, Switzerland.


Escherichia coli responds to the accumulation of misfolded proteins by inducing the transcription of heat shock genes. Efinal sigma(E) RNA polymerase controls one of the two heat shock regulons of E. coli. This regulon is activated upon accumulation of misfolded polypeptides in the double membrane envelope of E. coli. final sigma(E) (RpoE) is a member of the extracytoplasmic function subfamily of sigma factors. Here we asked how many genes are activated by Efinal sigma(E) RNA polymerase and what is the identity of these genes. Using two independent genetic approaches, 20 E. coli promoters were identified which activate reporter gene transcription in a final sigma(E)-dependent manner. In all cases examined, a canonical final sigma(E) binding site could be revealed upon mapping transcriptional start sites. 10 identified promoters activated the transcription of previously identified genes with four genes acting directly on the folding of E. coli envelope proteins (dsbC, fkpA, skp, and surA). The remaining promoters transcribed genes that are presumed to encode hitherto unknown extracytoplasmic functions and were named ecf (ecfA-ecfM). Two of these ecf genes were found to be essential for E. coli growth.

[Indexed for MEDLINE]
Free full text

Supplemental Content

Full text links

Icon for HighWire
Loading ...
Support Center