Collection of sigma factors in Escherichia coli

Sigma factors play important
roles as transcription factors in bacterial species. Able to regulate the
transcription of many genes in its regulon, transcription of particular sigma
factors signals the activation of an entire set of genes for initiating a change
in cell differentiation or entry into survival response such as responding to
heat shock. Collated here is a partial list of sigma factors in Escherichia
coli that may find use in understanding the bacterial cell biology
literature or serving as an initial guide into the multi-facet world of
bacterial gene expression regulation.