EC 3.2.1.8: endo-1,4-beta-xylanase

HydrolasesOpen in Browse

CatLog read 76 records for EC 3.2.1.8 from 7 papers, for 7 organisms. Names in these papers: xylanase 10A (Xyl10A), xylanase A (BsXynA), endo-β-1,4-xylanase GsXynA (GH10), endo-1,4-β-D-xylanase (GH11) and 5 more.

Read from the paper by an AI model and checked against the paper by a second, separate AI run; code converted the units.

CatLog also holds 153 records for EC 3.2.1.8 that are not yet re-read: from its earlier version, built from the enzyme databases and partly checked against the papers. All records for EC 3.2.1.8 in Browse.

Papers

Papers with records for EC 3.2.1.8
Paper	Organisms	Records
Substrate specificity in glycoside hydrolase family 10. Tyrosine 87 and leucine 314 play a pivotal role in discriminating between glucose and xylose binding in the proximal active site of…	Cellulomonas fimi, Pseudomonas cellulosa	34
Crystallographic and activity-based evidence for thumb flexibility and its relevance in glycoside hydrolase family 11 xylanases	Bacillus subtilis	22
The xylan-degrading enzyme system of Talaromyces emersonii: novel enzymes with activity against aryl beta-D-xylosides and unsubstituted xylans	Talaromyces emersonii	7
Endo-β-1,4-Xylanase GH10 from Geobacillus stearothermophilus CECT43: Biochemical Characterization, Insights into Its Thermal Behavior, and Synergistic Effects with a β-Xylosidase	Geobacillus stearothermophilus	5
Single-Molecule Imaging of Wood Xylans on Surfaces and Their Interaction with GH11 Xylanase	Neocallimastix patriciarum	4
A Versatile Protein Scaffold Engineered for the Hierarchical Assembly of Robust and Highly Active Enzymes	Aspergillus niger	2
Production of Xylooligosaccharides (XOSs) with Anti-inflammatory and Prebiotic Activities Using Recombinant Endo-1,4-β-xylanases from Bacillus subtilis	Bacillus subtilis	2

Records

Records for EC 3.2.1.8 read from the paper
Enzyme	Organism	Substrate	k_cat (s⁻¹)	K_m (mM)	k_cat/K_m (mM⁻¹ s⁻¹)	Conditions	Paper	Open record
Cex (family 10 xylanase)	Cellulomonas fimi	β-D-cellobiosyl fluoride	—	—	1.18	pH 7.2, 37 °C	PMID 10767281	Open record: Cex (family 10 xylanase), β-D-cellobiosyl fluoride
Endo-1,4-beta-xylanase A (XynA)	Aspergillus niger	xylan	5.85	24.74	0.24	pH 4, 50 °C	PMID 39985242	Open record: Endo-1,4-beta-xylanase A (XynA), xylan
Endo-1,4-beta-xylanase A (XynA)	Aspergillus niger	xylan	12.69	21.58	0.59	pH 4, 50 °C	PMID 39985242	Open record: Endo-1,4-beta-xylanase A (XynA), xylan
endo-1,4-beta-xylanase XynA (BsXynA11)	Bacillus subtilis	beechwood xylanamylose-purified	8.44 × 10³	—	—	pH 6.5, 60 °C	PMID 41838424	Open record: endo-1,4-beta-xylanase XynA (BsXynA11), beechwood xylan
endo-1,4-beta-xylanase XynA (BsXynA11)	Bacillus subtilis	beechwood xylanNi-NTA purified	2.7 × 10³	—	—	pH 6.5, 60 °C	PMID 41838424	Open record: endo-1,4-beta-xylanase XynA (BsXynA11), beechwood xylan
endo-1,4-β-D-xylanase (GH11)	Neocallimastix patriciarum	xylan from beechwood (4-O-methylglucuronic acid substitution 12 mol %)1 (Figure 3c)	121	—	—	pH 6	PMID 40014065	Open record: endo-1,4-β-D-xylanase (GH11), xylan from beechwood (4-O-methylglucuronic acid substitution 12 mol %)
endo-1,4-β-D-xylanase (GH11)	Neocallimastix patriciarum	xylan from beechwood (4-O-methylglucuronic acid substitution 12 mol %)2 (Figure 3d)	136	—	—	pH 6	PMID 40014065	Open record: endo-1,4-β-D-xylanase (GH11), xylan from beechwood (4-O-methylglucuronic acid substitution 12 mol %)
endo-1,4-β-D-xylanase (GH11)	Neocallimastix patriciarum	xylan from birchwood (4-O-methylglucuronic acid substitution 10 mol %)1 (Figure 3a)	152	—	—	pH 6	PMID 40014065	Open record: endo-1,4-β-D-xylanase (GH11), xylan from birchwood (4-O-methylglucuronic acid substitution 10 mol %)
endo-1,4-β-D-xylanase (GH11)	Neocallimastix patriciarum	xylan from birchwood (4-O-methylglucuronic acid substitution 10 mol %)2 (Figure 3b)	140	—	—	pH 6	PMID 40014065	Open record: endo-1,4-β-D-xylanase (GH11), xylan from birchwood (4-O-methylglucuronic acid substitution 10 mol %)
endo-β-1,4-xylanase GsXynA (GH10)	Geobacillus stearothermophilus	4,6-O-(3-ketobutylidene)-4-nitrophenyl-β-D-4^5-glucosyl-xylopentaoside	24.67	0.53	46.55	pH 6.5, 50 °C	PMID 42653343	Open record: endo-β-1,4-xylanase GsXynA (GH10), 4,6-O-(3-ketobutylidene)-4-nitrophenyl-β-D-4^5-glucosyl-xylopentaoside
endo-β-1,4-xylanase GsXynA (GH10)	Geobacillus stearothermophilus	4-nitrophenyl-β-xylobioside	32.67	0.15	217.8	pH 6.5, 50 °C	PMID 42653343	Open record: endo-β-1,4-xylanase GsXynA (GH10), 4-nitrophenyl-β-xylobioside
endo-β-1,4-xylanase GsXynA (GH10)	Geobacillus stearothermophilus	beechwood xylan	719	—	—	pH 6.5, 50 °C	PMID 42653343	Open record: endo-β-1,4-xylanase GsXynA (GH10), beechwood xylan
endo-β-1,4-xylanase GsXynA (GH10)	Geobacillus stearothermophilus	birchwood xylan	280	—	—	pH 6.5, 50 °C	PMID 42653343	Open record: endo-β-1,4-xylanase GsXynA (GH10), birchwood xylan
endo-β-1,4-xylanase GsXynA (GH10)	Geobacillus stearothermophilus	wheat arabinoxylan	395	—	—	pH 6.5, 50 °C	PMID 42653343	Open record: endo-β-1,4-xylanase GsXynA (GH10), wheat arabinoxylan
xylanase 10A (Xyl10A)	Pseudomonas cellulosa	(4-methyl)umbelliferyl-d-glucopyranoside-β(1′,4′)-d-xylopyranoside	42.68	1.1	38.8	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A), (4-methyl)umbelliferyl-d-glucopyranoside-β(1′,4′)-d-xylopyranoside
xylanase 10A (Xyl10A)	Pseudomonas cellulosa	4-methylumbelliferyl-β-cellobioside	2.43	45	0.053	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A), 4-methylumbelliferyl-β-cellobioside
xylanase 10A (Xyl10A)	Pseudomonas cellulosa	4-methylumbelliferyl-β-xylobioside	70.6	0.401	172.2	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A), 4-methylumbelliferyl-β-xylobioside
xylanase 10A (Xyl10A)	Pseudomonas cellulosa	4-methylumbelliferyl-β-xylopyranoside	5.62	262	0.022	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A), 4-methylumbelliferyl-β-xylopyranoside
xylanase 10A (Xyl10A)	Pseudomonas cellulosa	4-nitrophenyl-β-cellobioside	2.08	41	0.05	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A), 4-nitrophenyl-β-cellobioside
xylanase 10A (Xyl10A)	Pseudomonas cellulosa	4-nitrophenyl-β-xylobioside	78.75	0.53	148.6	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A), 4-nitrophenyl-β-xylobioside
xylanase 10A (Xyl10A)	Pseudomonas cellulosa	oat spelt xylan	588.4	—	—	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A), oat spelt xylan
xylanase 10A (Xyl10A)	Pseudomonas cellulosa	β-D-cellobiosyl fluoride	—	—	0.083	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A), β-D-cellobiosyl fluoride
xylanase 10A (Xyl10A)variant L314A	Pseudomonas cellulosa	4-methylumbelliferyl-β-cellobioside	1.68	28	0.06	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant L314A, 4-methylumbelliferyl-β-cellobioside
xylanase 10A (Xyl10A)variant L314A	Pseudomonas cellulosa	4-methylumbelliferyl-β-xylobioside	0.68	1.2	0.57	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant L314A, 4-methylumbelliferyl-β-xylobioside
xylanase 10A (Xyl10A)variant L314A	Pseudomonas cellulosa	4-nitrophenyl-β-cellobioside	1.52	33	0.047	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant L314A, 4-nitrophenyl-β-cellobioside
xylanase 10A (Xyl10A)variant L314A	Pseudomonas cellulosa	4-nitrophenyl-β-xylobioside	0.8	1.1	0.73	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant L314A, 4-nitrophenyl-β-xylobioside
xylanase 10A (Xyl10A)variant L314A	Pseudomonas cellulosa	oat spelt xylan	39.92	—	—	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant L314A, oat spelt xylan
xylanase 10A (Xyl10A)variant L314A/Y87F	Pseudomonas cellulosa	4-methylumbelliferyl-β-cellobioside	3.08	15	0.205	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant L314A/Y87F, 4-methylumbelliferyl-β-cellobioside
xylanase 10A (Xyl10A)variant L314A/Y87F	Pseudomonas cellulosa	4-methylumbelliferyl-β-xylobioside	0.15	1.6	0.093	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant L314A/Y87F, 4-methylumbelliferyl-β-xylobioside
xylanase 10A (Xyl10A)variant L314A/Y87F	Pseudomonas cellulosa	4-nitrophenyl-β-cellobioside	3.42	13	0.262	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant L314A/Y87F, 4-nitrophenyl-β-cellobioside
xylanase 10A (Xyl10A)variant L314A/Y87F	Pseudomonas cellulosa	4-nitrophenyl-β-xylobioside	0.17	1.5	0.112	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant L314A/Y87F, 4-nitrophenyl-β-xylobioside
xylanase 10A (Xyl10A)variant L314A/Y87F	Pseudomonas cellulosa	oat spelt xylan	45.75	—	—	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant L314A/Y87F, oat spelt xylan
xylanase 10A (Xyl10A)variant W313A	Pseudomonas cellulosa	4-nitrophenyl-β-cellobioside	0.047	139	3.3 × 10⁻⁴	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant W313A, 4-nitrophenyl-β-cellobioside
xylanase 10A (Xyl10A)variant W313A	Pseudomonas cellulosa	4-nitrophenyl-β-xylobioside	0.67	5	0.135	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant W313A, 4-nitrophenyl-β-xylobioside
xylanase 10A (Xyl10A)variant W313A	Pseudomonas cellulosa	oat spelt xylan	89.1	—	—	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant W313A, oat spelt xylan
xylanase 10A (Xyl10A)variant Y87A	Pseudomonas cellulosa	4-methylumbelliferyl-β-cellobioside	3.3	21	0.157	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87A, 4-methylumbelliferyl-β-cellobioside
xylanase 10A (Xyl10A)variant Y87A	Pseudomonas cellulosa	4-methylumbelliferyl-β-xylobioside	20.75	0.52	39.9	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87A, 4-methylumbelliferyl-β-xylobioside
xylanase 10A (Xyl10A)variant Y87A	Pseudomonas cellulosa	4-methylumbelliferyl-β-xylopyranoside	3.23	271	0.012	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87A, 4-methylumbelliferyl-β-xylopyranoside
xylanase 10A (Xyl10A)variant Y87A	Pseudomonas cellulosa	4-nitrophenyl-β-cellobioside	3.62	25	0.14	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87A, 4-nitrophenyl-β-cellobioside
xylanase 10A (Xyl10A)variant Y87A	Pseudomonas cellulosa	4-nitrophenyl-β-xylobioside	7.35	0.31	23.72	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87A, 4-nitrophenyl-β-xylobioside
xylanase 10A (Xyl10A)variant Y87A	Pseudomonas cellulosa	oat spelt xylan	269.1	—	—	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87A, oat spelt xylan
xylanase 10A (Xyl10A)variant Y87F	Pseudomonas cellulosa	4-methylumbelliferyl-β-cellobioside	2.88	21	0.138	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87F, 4-methylumbelliferyl-β-cellobioside
xylanase 10A (Xyl10A)variant Y87F	Pseudomonas cellulosa	4-methylumbelliferyl-β-xylobioside	18.25	0.43	42.45	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87F, 4-methylumbelliferyl-β-xylobioside
xylanase 10A (Xyl10A)variant Y87F	Pseudomonas cellulosa	4-methylumbelliferyl-β-xylopyranoside	5.15	254	0.02	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87F, 4-methylumbelliferyl-β-xylopyranoside
xylanase 10A (Xyl10A)variant Y87F	Pseudomonas cellulosa	4-nitrophenyl-β-cellobioside	2.57	17	0.152	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87F, 4-nitrophenyl-β-cellobioside
xylanase 10A (Xyl10A)variant Y87F	Pseudomonas cellulosa	4-nitrophenyl-β-xylobioside	19.8	0.46	43.05	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87F, 4-nitrophenyl-β-xylobioside
xylanase 10A (Xyl10A)variant Y87F	Pseudomonas cellulosa	oat spelt xylan	733.0	—	—	pH 7.2, 37 °C	PMID 10767281	Open record: xylanase 10A (Xyl10A) variant Y87F, oat spelt xylan
xylanase A (BsXynA)	Bacillus subtilis	low viscosity wheat flour arabinoxylan	420	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA), low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)	Bacillus subtilis	soluble oat spelt xylan	370	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA), soluble oat spelt xylan
xylanase A (BsXynA)variant N114G	Bacillus subtilis	low viscosity wheat flour arabinoxylan	424	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant N114G, low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)variant N114G	Bacillus subtilis	soluble oat spelt xylan	363	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant N114G, soluble oat spelt xylan
xylanase A (BsXynA)variant N114P	Bacillus subtilis	low viscosity wheat flour arabinoxylan	107	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant N114P, low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)variant N114P	Bacillus subtilis	soluble oat spelt xylan	92	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant N114P, soluble oat spelt xylan
xylanase A (BsXynA)variant R112G	Bacillus subtilis	low viscosity wheat flour arabinoxylan	56	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant R112G, low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)variant R112G	Bacillus subtilis	soluble oat spelt xylan	45	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant R112G, soluble oat spelt xylan
xylanase A (BsXynA)variant R112P	Bacillus subtilis	low viscosity wheat flour arabinoxylan	82	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant R112P, low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)variant R112P	Bacillus subtilis	soluble oat spelt xylan	79	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant R112P, soluble oat spelt xylan
xylanase A (BsXynA)variant T111G	Bacillus subtilis	low viscosity wheat flour arabinoxylan	414	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant T111G, low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)variant T111G	Bacillus subtilis	soluble oat spelt xylan	294	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant T111G, soluble oat spelt xylan
xylanase A (BsXynA)variant T111P	Bacillus subtilis	low viscosity wheat flour arabinoxylan	346	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant T111P, low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)variant T111P	Bacillus subtilis	soluble oat spelt xylan	373	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant T111P, soluble oat spelt xylan
xylanase A (BsXynA)variant T126G	Bacillus subtilis	low viscosity wheat flour arabinoxylan	427	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant T126G, low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)variant T126G	Bacillus subtilis	soluble oat spelt xylan	324	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant T126G, soluble oat spelt xylan
xylanase A (BsXynA)variant T126P	Bacillus subtilis	low viscosity wheat flour arabinoxylan	432	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant T126P, low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)variant T126P	Bacillus subtilis	soluble oat spelt xylan	362	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant T126P, soluble oat spelt xylan
xylanase A (BsXynA)variant Y113G	Bacillus subtilis	low viscosity wheat flour arabinoxylan	355	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant Y113G, low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)variant Y113G	Bacillus subtilis	soluble oat spelt xylan	313	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant Y113G, soluble oat spelt xylan
xylanase A (BsXynA)variant Y113P	Bacillus subtilis	low viscosity wheat flour arabinoxylan	313	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant Y113P, low viscosity wheat flour arabinoxylan
xylanase A (BsXynA)variant Y113P	Bacillus subtilis	soluble oat spelt xylan	276	—	—	pH 6, 40 °C	PMID 19422059	Open record: xylanase A (BsXynA) variant Y113P, soluble oat spelt xylan
xylosidase II (Xyl II), beta-xylosidase/xylanase II	Talaromyces emersonii	2-chloro-4-nitrophenyl beta-D-xylopyranoside	4722	2.9	1628	pH 5, 50 °C	PMID 8452541	Open record: xylosidase II (Xyl II), beta-xylosidase/xylanase II, 2-chloro-4-nitrophenyl beta-D-xylopyranoside
xylosidase II (Xyl II), beta-xylosidase/xylanase II	Talaromyces emersonii	2-nitrophenyl beta-D-xylopyranoside	523	1.8	292	pH 5, 50 °C	PMID 8452541	Open record: xylosidase II (Xyl II), beta-xylosidase/xylanase II, 2-nitrophenyl beta-D-xylopyranoside
xylosidase II (Xyl II), beta-xylosidase/xylanase II	Talaromyces emersonii	4-nitrophenyl beta-D-xylobioside	2876	0.4	7.19 × 10³	pH 5, 50 °C	PMID 8452541	Open record: xylosidase II (Xyl II), beta-xylosidase/xylanase II, 4-nitrophenyl beta-D-xylobioside
xylosidase II (Xyl II), beta-xylosidase/xylanase II	Talaromyces emersonii	4-nitrophenyl beta-D-xylopyranoside	898	32.9	27	pH 5, 50 °C	PMID 8452541	Open record: xylosidase II (Xyl II), beta-xylosidase/xylanase II, 4-nitrophenyl beta-D-xylopyranoside
xylosidase III (Xyl III), beta-xylosidase/xylanase III	Talaromyces emersonii	2-chloro-4-nitrophenyl beta-D-xylopyranoside	216	0.4	539	pH 5, 50 °C	PMID 8452541	Open record: xylosidase III (Xyl III), beta-xylosidase/xylanase III, 2-chloro-4-nitrophenyl beta-D-xylopyranoside
xylosidase III (Xyl III), beta-xylosidase/xylanase III	Talaromyces emersonii	2-nitrophenyl beta-D-xylopyranoside	345	3.3	104	pH 5, 50 °C	PMID 8452541	Open record: xylosidase III (Xyl III), beta-xylosidase/xylanase III, 2-nitrophenyl beta-D-xylopyranoside
xylosidase III (Xyl III), beta-xylosidase/xylanase III	Talaromyces emersonii	4-nitrophenyl beta-D-xylopyranoside	61	1.4	43	pH 5, 50 °C	PMID 8452541	Open record: xylosidase III (Xyl III), beta-xylosidase/xylanase III, 4-nitrophenyl beta-D-xylopyranoside