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. 2000 Dec;9(12):2446–2456. doi: 10.1110/ps.9.12.2446

Resonant mirror biosensor analysis of type Ialpha cAMP-dependent protein kinase B domain--cyclic nucleotide interactions.

W W Muhonen 1, J B Shabb 1
PMCID: PMC2144508  PMID: 11206066

Abstract

A resonant mirror biosensor was used to study cyclic nucleotide-receptor interactions. In particular, a novel method was developed to determine inhibition constants (Ki) from initial rates of ligate association to immobilized ligand. This approach was applied to the comparison of cyclic nucleotide-binding properties of the wild-type isolated B domain of the cAMP-dependent protein kinase type Ialpha regulatory subunit and its Ala-334-Thr (A334T) variant that has altered cyclic nucleotide specificity. A cUMP-saturated form of the B domain was used for all measurements. Under the conditions used, cUMP did not affect the kinetics of B domain association to immobilized cAMP. Triton X-100 was required to stabilize the protein at nanomolar concentrations. The association and dissociation rate constants for wild-type and A334T B domains yielded equilibrium dissociation constants of 11 and 16 nM. Heterogeneity of ligate and immobilized ligand, mass transport effects, and other factors were evaluated for their influence on biosensor-determined kinetic constants. Biosensor-determined relative inhibition constants (Ki' = Ki(cAMP)/Ki(analog)) for 16 cyclic nucleotide analogs correlated well with those determined by a [3H]cAMP binding assay. Previously published Ki' values for the B domain in the intact regulatory subunit were similar to those of the isolated B domain. The Ki' values for the wild-type and A334T B domains were essentially unchanged except for dramatic enhancements in affinity of cGMP analogs for the A334T B domain. These observations validate the isolated B domain as a simple model system for studying cyclic nucleotide-receptor interactions.

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Selected References

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