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It is known that the level of cGMP is modulated in response to a number of stimuli in plant cells but intracellular events distal to cGMP metabolism are not clear. Cyclic GMP-dependent protein kinase (Pk-G) is a major effector of cGMP action in animals and yeasts. We wanted to determine whether such kinase is present in plant cells. A soluble protein kinase was isolated from seedlings of Pharbitis...
A soluble Ca 2+ -dependent protein kinase (CDPK) was isolated from seedlings of the short-day plant Pharbitis nil and purified to homogeneity. Activity of Pharbitis nil CDPK (PnCDPK) was strictly dependent on the presence of Ca 2+ (K 0,5 =4,9 μM). The enzyme was autophosphorylated on serine and threonine residues and phosphorylated a wide diversity of substrates only on serine...
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