Table2.

Mass spectrometry of autophosphorylated Drosophila CaMKII does not identify GTP-specific sites. Untreated (BASAL) Drosophila CaMKII and kinase autophosphorylated with non-radioactive ATP or GTP were analysed by mass spectrometry. Phosphopeptide sequences are shown at left with the phosphorylated residue in bold. + indicates that a particular peptide was found under the indicated condition.

aa Sequence	aa	BASAL	ATP	GTP	Function
VASVVHRQETVDC	S280		+	+
VASVVHRQETVDC	T287			+	CaMKII active/Ca2+ independent
KGEGSQVKESTDSSSTTKEDDDIK	S327	+	+	+
KGEGSQVKESTDSSSTTKEDDDIK	S332	+
KGEGSQVKESTDSSSTTKEDDDIK	T333	+	+	+
KGEGSQVKESTDSSSTTKEDDDIK	S335		+
KGEGSQVKESTDSSSTTKEDDDIK	S336	+	+
KGEGSQVKESTDSSSTTKEDDDIK	S337		+
KGEGSQVKESTDSSSTTKEDDDIK	T338	+	+
KGEGSQVKESTDSSSTTKEDDDIK	T339	+	+	+
ISGATTFDFIPQK	S505		+
ISGATTFDFIPQK	T508	+	+
ISGATTFDFIPQK	T509		+	+