Table 4.

Substituents allowed in the subsites of GH family 10, 11 and 30 subfamily 8. Araf: arabinose substituent, MeGlcA: methylglucuronic acid substituent, P: permitted, B: banned, N: necessary. P/B: not conserved, permitted in some, banned in others.

GH family	Substituent	Glycone subsites			Aglycone subsites
		-3	-2	-1	+1	+2	+3
10	Araf		P	B	P/B	P/B	P/B
	MeGlcA	P	B	B	P/B
11	Araf	P	P/B	B	B	P
	MeGlcA	P/B	P/B	B	B	P
30_81	MeGlcA		N	B

¹Only typical GH30_8 xylanases with glucuronoxylanase activity are considered. These enzymes show no or very low activity on arabinoxylan.