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EC Tree
The taxonomic range for the selected organisms is: Pseudoalteromonas haloplanktis The enzyme appears in selected viruses and cellular organisms
Synonyms
endoxylanase, xylanase a, endo-xylanase, xyn11a, xyn10a, beta-xylanase, endo-1,4-beta-xylanase, gh11 xylanase, xylanase b, xynii,
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(1--> 4)-beta-xylan 4-xylanohydrolase
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1,4-beta-D-xylan xylanohydrolase
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1,4-beta-D-xylan xylanohydrolase 22
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1,4-beta-xylan xylanohydrolase
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beta-1,4-D-xylanase
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beta-1,4-xylan xylanohydrolase
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beta-1,4-xylanase
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endo-(1--> 4)-beta-xylanase
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endo-1,4-beta-D-xylanase
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endo-1,4-beta-xylanase
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endo-1,4-xylanase
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endo-beta-1,4-xylanase
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xylanase, endo-1,4-
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additional information
enzyme belongs to family 8 of glycosyl hydrolases
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Endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans
Endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans
the O-glycoside hydrolase catalyzes the random hydrolysis of internal beta-1,4-D-xylosidic linkages of xylan and xylooligosaccharides of maximal 4 residue chain length, inverse stereoselectivity
Endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans
induced fit mechanism upon ligand binding
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4-beta-D-xylan xylanohydrolase
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xylan + H2O
D-xylotriose + xylotetraose + ?
xylooligosaccharide + H2O
D-xylotriose + xylotetraose
long-chain substrates, high activity
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xylopentaose + H2O
xylotriose + xylobiose
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additional information
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xylan + H2O
D-xylotriose + xylotetraose + ?
major constituent of plant hemicellulose forming the cell walls of hards woods, 15-30%, and softwoods, 7-10%
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xylan + H2O
D-xylotriose + xylotetraose + ?
from oat spelt and other sources, xylan substrate specificity overview, inverse stereoselectivity, enzyme possesses a large substrate binding cleft with at least 6 xylose-binding sites
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additional information
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unrooted evolutionary tree, overview
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additional information
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enzyme shows no cellulase, chitosanase, and lichenase activity
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xylan + H2O
D-xylotriose + xylotetraose + ?
major constituent of plant hemicellulose forming the cell walls of hards woods, 15-30%, and softwoods, 7-10%
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additional information
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unrooted evolutionary tree, overview
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Cu2+
16% inhibition at 1 mM
Hg2+
31% inhibition at 1 mM
Ni2+
6% inhibition at 1 mM
Zn2+
14% inhibition at 1 mM
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additional information
additional information
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additional information
psychrophilic enzyme with high activity at low temperatures and low thermal stability
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5 - 35
60% of maximal activity at 5°C
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SwissProt
brenda
gene xyl; psychrophilic enzyme, antarctic bacterium
SwissProt
brenda
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brenda
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Q8RJN8_PSEHA
426
0
48407
TrEMBL
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45982
x * 45982, mass spectrometry
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?
x * 45982, mass spectrometry
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mutants D144A, E78Q, in complex with substrate xylopentaose and product xylotriose
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D144A
crystallization data
E78Q
crystallization data
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additional information
psychrophilic enzyme with high activity at low temperatures and low thermal stability
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recombinant enzyme from Escherichia coli, native enzyme 11fold by ultrafiltration and ion exchange chromatography
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DNA and amino acid sequence determination and analysis, overexpression in Escherichia coli BL21(DE3)
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Collins, T.; Meuwis, M.A.; Stals, I.; Claeyssens, M.; Feller, G.; Gerday, C.
A novel family 8 xylanase, functional and physicochemical characterization
J. Biol. Chem.
277
35133-35139
2002
Pseudoalteromonas haloplanktis (Q8RJN8)
brenda
De Vos, D.; Collins, T.; Nerinckx, W.; Savvides, S.N.; Claeyssens, M.; Gerday, C.; Feller, G.; Van Beeumen, J.
Oligosaccharide binding in family 8 glycosidases: crystal structures of active-site mutants of the beta-1,4-xylanase pXyl from Pseudoaltermonas haloplanktis TAH3a in complex with substrate and product
Biochemistry
45
4797-4807
2006
Pseudoalteromonas haloplanktis (Q8RJN8), Pseudoalteromonas haloplanktis TAH3a (Q8RJN8), Pseudoalteromonas haloplanktis TAH3a
brenda