Osmoregulation by potassium transport inEscherichia coli
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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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Potassium glutamate accumulates upon hyper-osmotic shock and serves as a temporary osmoprotectant. This salt leads to transcriptional activation of sets of genes that allow the cell to achieve long-term adaptation to high osmolarity. The current experiments show that potassium glutamate also acts as an inhibitor of bulk cellular transcription. It can do so independent of the involvement of macr...
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Active transport of glutamate by Escherichia coli K-12 requires both Na(+) and K(+) ions. Increasing the concentration of Na(+) in the medium results in a decrease in the K(m) of the uptake system for glutamate; the capacity is not affected. Glutamate uptake by untreated cells is not stimulated by K(+). K(+)-depleted cells show a greatly reduced capacity for glutamate uptake. Preincubation of s...
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ژورنال
عنوان ژورنال: FEMS Microbiology Letters
سال: 1986
ISSN: 0378-1097,1574-6968
DOI: 10.1111/j.1574-6968.1986.tb01845.x