PMID: 2508559Nov 1, 1989Paper

Ca2+-independent interaction of the gamma subunit of phosphorylase kinase with dansyl-calmodulin

Archives of Biochemistry and Biophysics
C J Yuan, D J Graves

Abstract

A strong Ca2+-independent interaction between the isolated, active gamma subunit of phosphorylase kinase and dansyl-calmodulin (dansyl-CaM) was observed by monitoring changes in fluorescence intensity in the absence of calcium ion. The pure, active gamma subunit of phosphorylase kinase was simply prepared by dialyzing the HPLC-purified, inactive gamma subunit against 8 M urea, containing 0.1 mM DTT, 0.1 M Hepes at pH 6.8 or 0.1 M Tris at pH 8.2, followed by dilution of urea with pH 6.8 or 8.2 buffer. The dissociation constants determined by fluorescence spectroscopy for the gamma subunit to dansyl-CaM are 25.7 +/- 0.6 and 104 +/- 12 nM at pH 6.8 in the presence and absence of CaCl2. At pH 8.2, these values are 4.9 +/- 0.3 and 29 +/- 8 nM in the presence and absence of CaCl2. As the free Ca2+ decreases to as low as 10(-9) M, the fluorescence intensity and the fluorescence polarization of the gamma subunit and dansyl-CaM complex do not decrease in parallel, indicating that the complex does not come apart at low Ca2+ concentration. The presence of Mg2+ affects the interaction between dansyl-CaM and the gamma subunit, as indicated by the increase in the polarization of fluorescence of dansyl-CaM. Mn2+ interferes with the interactio...Continue Reading

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Citations

Jan 1, 1991·Documenta Ophthalmologica. Advances in Ophthalmology·J Lascaratos, S Marketos
Mar 31, 1995·The Journal of Biological Chemistry·C Y HuangD J Graves

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