Table 2. Minimal turnover numbers and second-order rate constants of the LZ-catalyzed RNA18 degradation^a.

	peptide	RNA18	cleavage	time	V obs	k obs (≤k cat)	k 2obs (≤k 2)
	µM	µM	%	h	nM min−1	min−1	M −1 min−1
GCN4 LZ35	30	50	17	2	70.8	0.0024	47
cJun LZ36	60	170	28	4	198	0.0033	19
cJun	20	90	50	48	15.6	0.0008	9

^aBased on the degradation rates of full-length 18-mer RNA substrate in 20 mM Tris-HCl, 80 mM KCl, pH 7.2, 37°C.