Osmoregulation by potassium transport in Escherichia coli
نویسندگان
چکیده
منابع مشابه
Cation Transport in Escherichia coli VIII. Potassium Transport Mutants
Analysis of K transport mutants indicates the existence of four separate K uptake systems in Escherichia coli K-12. A high affinity system called Kdp has a Km of 2 p.M, and Vmax at 37°C of 150/zmol/g min. This system is repressed by growth in high concentrations of K. Two constitutive systems, TrkA and TrkD, have K,,'s of 1.5 and 0.5 mM and Vm~x's of 550 and 40 at 37 and 30°C, respectively. Mut...
متن کاملCation transport in Escherichia coli. VIII. Potassium transport mutants
Analysis of K transport mutants indicates the existence of four separate K uptake systems in Escherichia coli K-12. A high affinity system called Kdp has a Km of 2 muM, and Vmax at 37 degrees C of 150 mumol/g min. This system is repressed by growth in high concentrations of K. Two constitutive systems, TrkA and TrkD, have Km's of 1.5 and 0.5 mM and Vmax's of 550 and 40 at 37 and 30 degrees C, r...
متن کاملCation Transport in Escherichia coli VIII. Potassium Transport Mutants
Analysis of K transport mutants indicates the existence of four separate K uptake systems in Escherichia coli K-12. A high affinity system called Kdp has a Km of 2 p.M, and Vmax at 37°C of 150/zmol/g min. This system is repressed by growth in high concentrations of K. Two constitutive systems, TrkA and TrkD, have K,,'s of 1.5 and 0.5 mM and Vm~x's of 550 and 40 at 37 and 30°C, respectively. Mut...
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EnvZ, a histidine kinase/phosphatase in Escherichia coli, responds to the osmolarity changes in the medium by regulating the phosphorylation state of the transcription factor OmpR, which controls the expression levels of outer membrane porin proteins OmpF and OmpC. Although both ompR and envZ genes are located on the ompB locus under the control of the ompB promoter and transcribed as a single ...
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Alkaline phosphatase, the phoA product, is synthesized constitutively in phoR mutants. This constitutive synthesis, which is independent of phosphate control, varies with changes in the osmolarity of the growth medium; phoA expression increases with increasing osmolarity. Maximum expression of the osmoregulated genes phoA, ompC, and ompF was achieved by osmotic manipulation of minimal medium; c...
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ژورنال
عنوان ژورنال: FEMS Microbiology Letters
سال: 1986
ISSN: 0378-1097
DOI: 10.1016/0378-1097(86)90063-7