1887

Abstract

SUMMARY: -Acetyl--glucosamine-induced germ tube formation in at 37 °C was accompanied by an increase in the rate of protein phosphorylation. The calmodulin antagonist trifluoperazine and the Ca ionophore A23187, which inhibited germ tube formation, also reduced the rate of phosphorylation. The rate of phosphorylation was also reduced when cells were incubated at 25 °C, which favoured yeast-phase growth. Two-dimensional SDS-PAGE analysis of phosphoproteins from germ-tube-forming and yeast cells revealed two germ-tube-specific and three yeast-specific phosphoproteins. Germ tubes and hyphae had more calmodulin activity than yeast cells, irrespective of the germ-tube-inducing condition used. As a first step towards understanding the inhibitory effect of trifluoperazine on germ tube formation, calmodulin from was purified to homogeneity. It was heat stable, and displayed a pronounced Ca-induced shift in electrophoretic mobility.

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/content/journal/micro/10.1099/00221287-136-11-2149
1990-11-01
2019-10-13
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