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J. Bacteriol., 09 1997, 5621-5624, Vol 179, No. 17
O Amster-Choder and A Wright
We have shown previously that the activity of BglG, the response regulator
of the bgl system, as a transcriptional antiterminator is modulated by the
sensor BglF, which reversibly phosphorylates BglG. We show here that the
phosphoryl group on BglG is present as a phosphoramidate, based on the
sensitivity of phosphorylated BglG to heat, hydroxylamine, and acidic but
not basic conditions. By analyzing the products of base-hydrolyzed
phosphorylated BglG by thin-layer chromatography, we show that the
phosphorylation occurs on a histidine residue. This result supports the
notion that the bgl system is a member of a new family of bacterial sensory
systems.
Copyright © 1997, American Society for Microbiology
BglG, the response regulator of the Escherichia coli bgl operon, is phosphorylated on a histidine residue
Department of Molecular Biology, Hadassah Medical School, The Hebrew University, Jerusalem, Israel.
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