Plant Genes Encoding Homologues of the SNF1 and Shaggy Protein Kinases

Critical enzymes and proteins are often regulated by the reversible addition of phosphate. The family of enzymes catalyzing this reaction is huge and diverse. There are two major classes of protein kinases: those having specificity for serine and threonine and those enzymes that phosphorylate tyrosine residues. Phosphatases reverse the effects of protein kinases and also play important roles in cellular physiology.