Potassium Uptake During Microcyst Formation in Myxococcus xanthus
AUTOR(ES)
Giberman, E.
RESUMO
The kinetics of 42K uptake by Myxococcus xanthus during vegetative growth and microcyst formation were determined. In the medium studied, growing cells concentrated potassium about 100-fold, yielding an intracellular concentration of 147 mm. The influx of K+ in growing cells was 17 ± 3 pmoles of K+/cm2 min. About 5 hr after induction of vegetative cells to microcysts, the K+ influx decreased and the intracellular concentration fell. By 18 hr after induction, there was no measurable influx of K+, and the intracellular concentration of potassium was less than 29 mm. There was, however, considerable binding of K+ to the “surface” of microcysts. It is postulated that the greatly reduced intracellular concentration of potassium helps to maintain the microcyst in its dormant state and protects it against enzymatic break-down.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=248186Documentos Relacionados
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