2.7.11.23	ATP + C-terminal domain of RNA polymerase II	the recombinant GST-tagged CTD substrate is hyperphosphorylated by Kin28	Saccharomyces cerevisiae	ADP + phosphorylated C-terminal domain of RNA polymerase II	-	?	381458	
2.7.11.23	ATP + casein	phosphorylated at about 30% the rate of RNA-polymerase II subunit	Homo sapiens	ADP + phosphocasein	-	?	323362	
2.7.11.23	ATP + casein	phosphorylated at about 30% the rate of RNA-polymerase II subunit	Triticum aestivum	ADP + phosphocasein	-	?	323362	
2.7.11.23	ATP + chicken myosin regulatory light-chain	-	Mus musculus	ADP + chicken myosin regulatory light-chain phosphate	-	?	357284	
2.7.11.23	ATP + CTD-containing fusion protein	-	Saccharomyces cerevisiae	ADP + phosphorylated CTD-containing fusion protein	-	?	452330	
2.7.11.23	ATP + CTD-containing fusion proteins	-	Homo sapiens	ADP + ?	-	?	357278	
2.7.11.23	ATP + CTD-containing fusion proteins	-	Saccharomyces cerevisiae	ADP + ?	-	?	357278	
2.7.11.23	ATP + CTD-containing fusion proteins	e.g. GAL4-CTD (formerly GC147) or HSP 90	Homo sapiens	ADP + ?	-	?	357278	
2.7.11.23	ATP + DYRKtide	-	Homo sapiens	ADP + phospho-DYRKtide	-	?	439170	
2.7.11.23	ATP + GST-tagged yCTD fusion protein	hCDK13 purified from nuclear extracts displays CTD kinase activity in vitro with recombinant GST-tagged yeast CTD fusion proteins as substrate, hyperphosphorylation of the CTD by hCDK13 kinase	Homo sapiens	?	-	?	439180