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- W2031769010 abstract "An early development-specific soluble 55 kDa Ca(2+)-dependent protein kinase has been purified to homogeneity from sandalwood somatic embryos and biochemically characterized. The purified enzyme, swCDPK, resolved into a single band on 10% polyacrylamide gels, both under denaturing and non-denaturing conditions. swCDPK activity was strictly dependent on Ca(2+), K(0.5) (apparent binding constant) for Ca(2+)-activation of substrate phosphorylation activity being 0.7 microM and for autophosphorylation activity approximately 50 nM. Ca(2+)-dependence for activation, CaM-independence, inhibition by CaM-antagonist (IC(50) for W7=6 microM, for W5=46 microM) and cross-reaction with polyclonal antibodies directed against the CaM-like domain of soybean CDPK, confirmed the presence of an endogenous CaM-like domain in the purified enzyme. Kinetic studies revealed a K(m) value of 1.3 mg/ml for histone III-S and a V(max) value of 0.1 nmol min(-1) mg(-1). The enzyme exhibited high specificity for ATP with a K(m) value of 10 nM. Titration with calcium resulted in the enhancement of intrinsic emission fluorescence of swCDPK and a shift in the lambda(max) emission from tryptophan residues. A reduction in the efficiency of non-radiative energy transfer from tyrosine to tryptophan residues was also observed. These are taken as evidence for the occurrence of Ca(2+)-induced conformational change in swCDPK. The emission spectral properties of swCDPK in conjunction with Ca(2+) levels required for autophosphorylation and substrate phosphorylation help understand mode of Ca(2+) activation of this enzyme." @default.
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- W2031769010 date "2001-09-01" @default.
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- W2031769010 title "Purification and characterization of a Ca2+-dependent protein kinase from sandalwood (Santalum album L.): evidence for Ca2+-induced conformational changes" @default.
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- W2031769010 doi "https://doi.org/10.1016/s0031-9422(01)00231-x" @default.
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