Osmotic regulation of PhoE porin synthesis in Escherichia coli.
In Escherichia coli, adaptation to hyperosmotic conditions alters the expression of the outer membrane porins OmpF and OmpC. The amount of PhoE porin, which is normally induced by phosphate deprivation, was greatly reduced in cells adapted to high-osmolarity conditions. Osmoregulation of PhoE operated independently of the activity of the PhoR phosphate sensor and did not involve cross-talk from the homologous osmosensor EnvZ. PhoE synthesis was partially restored by additional copies of the positive regulator phoB+ and by the osmoprotectant glycine betaine.
Meyer
S E
SE
Department of Biochemistry and Biophysics, University of California, Davis 95616.
Granett
S
S
Jung
J U
JU
Villarejo
M R
MR
D001425:Bacterial Outer Membrane Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D003470:Culture Media; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D009994:Osmolar Concentration; D018272:Porins
D001425:Bacterial Outer Membrane Proteins; D003470:Culture Media; D018272:Porins