Extracytoplasmic function (ECF) sigma factors are a distinct subset of sigma factors that enable bacteria to respond robustly to a myriad of environmental challenges. By directing RNA polymerase to ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 99, No. 4 (Feb. 19, 2002), pp. 1831-1835 (5 pages) Anti-sigma factors regulate prokaryotic gene expression through ...