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. 1978 Jun;134(3):1064–1073. doi: 10.1128/jb.134.3.1064-1073.1978

Regulation of cyclic AMP levels in Arthrobacter crystallopoietes and a morphogenetic mutant.

R W Hamilton, P E Kolenbrander
PMCID: PMC222356  PMID: 207674

Abstract

The extracellular levels of cyclic AMP (cAMP), cAMP phosphodiesterase activity, and adenylate cyclase activity were measured at various intervals during growth and morphogenesis of Arthrobacter crystallopoietes. There was a significant rise in the extracellular cAMP level at the onset of stationary phase, and this rise coincided with a decrease in intracellular cAMP. The phosphodiesterase activity measured in vitro increased in the early exponential phase of growth as intracellular cAMP decreased, and, conversely, prior to the onset of stationary phase the phosphodiesterase activity decreased as the intracellular cAMP levels increased. Adenylate cyclase activity was greater in cell extracts prepared from cells grown in a medium where morphogenesis was observed. Pyruvate stimulated adenylate cyclase activity in vitro. A morphogenetic mutant, able to grow only as spheres in all media tested, was shown to have altered adenylated cyclase activity, whereas no significant difference compared to the parent strain was detectable in either the phosphodiesterase activity or the levels of extracellular cAMP. The roles of the two enzymes, adenylate cyclase and phosphodiesterase, and excretion of cAMP are discussed with regard to regulation of intracellular cAMP levels and morphogenesis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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