protein kinasemedical dictionary

<enzyme>

<cell biology> Enzyme catalysing transfer of phosphate from ATP to hydroxyl side chains on proteins, causing changes in function. most phosphate on proteins of animal cells is on serine residues, less on threonine, with a very small amount on tyrosine residues. Tyrosine kinases phosphorylate proteins on tyrosine, serine / threonine kinases on serine or threonine.

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

(11 Mar 2008)