. 2003 Oct 1;22(19):4922–4932. doi: 10.1093/emboj/cdg494

Table II. AbfA kinetic parameters for the hydrolysis of aryl-α-l-arabinofuranosides and aryl-β-d-xylopyranosides^a.

Phenol substituent (pKa)	Glycon^b	k_cat (s^–1)	Ratio k_cat [AF/Xyl]	K_m (mM)	Ratio K_m [AF/Xyl]	k_cat/K_m (s^–1 mM^–1)	Ratio k_cat/K_m [AF/Xyl]
2,5-Dinitro (5.15)	AF	190	2.6	0.35	1/23	540	60
	Xyl	74		8.0		9.3
3,4-Dinitro (5.36)	AF	340	34	0.53	1/8	640	280
	Xyl	10		4.4		2.3
4-Nitro (7.18)	AF	87	4.3	0.65	1/23	130	100
2-Nitro (7.22)	Xyl	20		15.3		1.3

^bAF, arabinofuranosyl; Xyl, xylopyranosyl.

Table II. AbfA kinetic parameters for the hydrolysis of aryl-α-l-arabinofuranosides and aryl-β-d-xylopyranosidesa.