TABLE 1.

Both degradation and inactivation of ODC require a hydrolyzable nucleotide triphosphate

Nucleotide (5 mM)	Degradation		Inactivation
	%/h	% ATP	%/h	% ATP
None	1.9	0	15.8	18
ATP	49.5	100	87.4	100
CTP	47.5	89	91.4	105
UTP	34.7	42	73.4	84
GTP	41.0	69	83.3	95
α,β-Methylene-ATP	3.4	7	25.1	29
β,γ-Methylene-ATP	0.9	2	3.8	4
ATP with no Mg2+ and 5 mM EDTA	0	0	3.0	3