<enzyme>

<molecular biology> Widely used abbreviation for phosphokinase, an enzyme catalysing transfer of phosphate from ATP to a second substrate usually specified in less abbreviated name, for example creatine phosphokinase (creatine kinase), protein kinase. Serine / threonine kinases phosphorylate on serine or threonine residues, tyrosine kinases on tyrosines.

This entry appears with permission from the Dictionary of Cell and Molecular Biology

(11 Mar 2008)