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Abstract
Non-enzymic methods for the phosphorylation of proteins are reviewed with respect to type of reagent, protein source, reactive site (N[sbnd], O[sbnd] or S[sbnd]), extent of reaction, and effect on physical properties, functionality and biological properties. Experimental procedures are given to illustrate the most important methods. Some enzymic methods are included for comparison. The evidence for phosphorylation of specific amino acid residues, such as serine, threonine, histidine or lysine, is critically assessed. Conclusions are drawn regarding the status of phosphorylation as a synthetic method for modifying proteins.