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Literature summary for 3.2.1.8 extracted from

  • Sandrim, V.C.; Rizzatti, A.C.; Terenzi, H.F.; Jorge, J.A.; Milagres, A.M.; Polizeli, M.L.
    Purification and biochemical characterization of two xylanases produced by Aspergillus caespitosus and their potential for kraft pulp bleaching (2005), Proc. Biochem., 40, 1823-1828.
No PubMed abstract available

Activating Compound

Activating Compound Comment Organism Structure
2-mercaptoethanol isoform xyl I, 59% activation, xyl II, 102% activation Aspergillus caespitosus

Inhibitors

Inhibitors Comment Organism Structure
Ba2+ 1 mM, isoform xyl I, 49% inhibition, xyl II, 11% inhibition Aspergillus caespitosus
Ca2+ 1 mM, isoform xyl I, 71% inhibition, xyl II, 9% inhibition Aspergillus caespitosus
CuSO4 1 mM, isoform xyl I, 85% inhibition, xyl II, 24% inhibition Aspergillus caespitosus
Hg2+ both isoform xyl I, xyl II, complete inhibition Aspergillus caespitosus
NaCl 1 mM, isoform xyl I, 28% inhibition, xyl II, 19% inhibition Aspergillus caespitosus
Zn2+ 1 mM, isoform xyl I, 70% inhibition, xyl II, 10% inhibition Aspergillus caespitosus

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
7700
-
isoform xyl II, gelfiltration Aspergillus caespitosus
17700
-
1 * 27000, isoform xyl I, 1 * 17700, isoform xylII, SDS-PAGE Aspergillus caespitosus
26300
-
isoform xyl I, gelfiltration Aspergillus caespitosus
27000
-
1 * 27000, isoform xyl I, 1 * 17700, isoform xylII, SDS-PAGE Aspergillus caespitosus

Organism

Organism UniProt Comment Textmining
Aspergillus caespitosus
-
isoforms xyl I, xyl II, growth in sugar cane bagasse
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
kraft pulp reduction of kappa number and increase in viscosity Aspergillus caespitosus ?
-
?
xylan + H2O birchwood xylan preferred Aspergillus caespitosus ?
-
?

Subunits

Subunits Comment Organism
monomer 1 * 27000, isoform xyl I, 1 * 17700, isoform xylII, SDS-PAGE Aspergillus caespitosus

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
50 55 both isoforms xyl I, xyl II Aspergillus caespitosus

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
55
-
isoform xyl I, half-life 27.3 min, xyl II, half-life above 90 min Aspergillus caespitosus

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
5.5 6.5 isoform xyl II Aspergillus caespitosus
6.5 7 isoform xyl I Aspergillus caespitosus