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. 1972 Jul;69(7):1791–1795. doi: 10.1073/pnas.69.7.1791

3′:5′-Cyclic Adenosine Monophosphate Phosphodiesterase: Negative Cooperativity

T R Russell *,†, W J Thompson *,‡, F W Schneider §, M M Appleman ¶,ǁ
PMCID: PMC426803  PMID: 4340159

Abstract

Kinetic and chromatographic analysis of cyclic nucleotide phosphodiesterase (EC 3.1.4.c) obtained from rat tissue has revealed that this enzyme exists in at least two molecular forms. After chromatographic separation, one form (cyclic AMP phosphodiesterase) still exhibits kinetics suggestive of the action of either two enzymes or one enzyme under negative cooperative regulation. Computer model studies were undertaken to distinguish between these two possibilities. The matrix method was used to generate the partition functions for (a) the sum of two independent enzymes and (b) one enzyme exhibiting negative cooperative kinetics. The experimental data were fitted to the theoretical models by a nonlinear least-squares computer program. The results show that, while both models can fit the data, the two-enzyme model would require contamination far in excess of what is detectable physically or by activity measurements. Thus, the negative cooperative model seems the more appropriate theoretical explanation of the observed kinetic behavior of this enzyme. The implication of negative cooperativity with respect to the regulation of cyclic AMP concentrations in physiological systems is discussed.

Keywords: kinetics, models, computer analysis, enzyme regulation

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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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