Table 1.

Synthetic peptides used as kinase substrates

Name	Sequence	Identification
PC9	GRGRSS*VYS	Phosphorylation site of Acanthamoeba myosin IC
PCJ	GRGRSS*VLS	As above, with leucine replacing tyrosine
PK12	KRASVVGT*TYWM	Phosphorylation site of MIHCK
PAK13	SKRSTMVGT*PYWM	Phosphorylation site of PAK

See text for references to peptide sequences. The asterisks identify the serine that has been shown to be phosphorylated in PC9 by MIHCK (MICHK phosphorylates the same residue in myosin IC) and the serine and threonines that are in the corresponding locations in PCJ and PK12 and PAK13, respectively. The tyrosine that is essential for phosphorylation of PC9 by MIHCK is underlined, as are the leucine and tyrosines in the corresponding locations in PCJ and PK12 and PAK13, respectively. See text for details.