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JBC, Vol. 252, Issue 20, 7146-7150, Oct, 1977

Cyclic AMP and the plasma membrane potential in Neurospora crassa

M. L. Pall

Diverse treatments, which have been shown by Slayman, C. L. (1977) in Water Relations in Membrane Transport in Plants and Animals (Jungreis, A., Hodges, T. K., Kleinzeller, A., and Schultz, S. G., eds) pp. 69-86, Academic Press, New York, to depolarize the plasma membrane of Neurospora, increase levels of adenosine 3':5'-monophosphate (cyclic AMP) in the organism. The treatments include those producing large transport fluxes of metabolizable or nonmetabolizable compounds, rapid temperature drops, and addition of agents which uncouple oxidative phosphorylation. Severe mechanical stress, which may also act to depolarize the plasma membrane, leads to increases in cyclic AMP. The maximal depolarization appears to precede the maximal cyclic AMP levels. It is proposed that the membrane depolarization produces the increased cyclic AMP levels by stimulating the plasma membrane-bound adenylate cyclase and that cyclic AMP may be important to the maintenance of membrane integrity.
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