Activation of the Prespore and Spore Cell Pathway of Dictyostelium Differentiation by CAMP-dependent Protein Kinase and Evidence for Its Upstream Regulation by Ammonia

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 1993 Jun 1

PMID 8508771

Citations 45

Authors

N A Hopper

A J Harwood

S Bouzid

M Veron

J G Williams

Affiliations

Soon will be listed here.

Abstract

Expression of a dominant inhibitor of the Dictyostelium cAMP-dependent protein kinase in prespore cells blocks their differentiation into spore cells. The resultant structures comprise a normal stalk supporting a bolus of cells that fail to express a sporulation-specific gene and that show greatly reduced levels of expression of several prespore-specific genes. The latter result suggests that in addition to activating spore formation, the cAMP-dependent protein kinase may play a role in initial prespore cell differentiation. Development of the strain expressing the dominant inhibitor is hypersensitive to the inhibitory effects of ammonia, the molecule that is believed to repress entry into culmination during normal development. This result supports a model whereby a decrease in ambient ammonia concentration at culmination acts to elevate intracellular cAMP and hence induce terminal differentiation.

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