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Literature summary for 3.2.1.37 extracted from

  • Mujer, C.V.; Miller, A.R.
    Purification and properties of beta-xylosidase isoenzymes from cucumber seeds (1991), Physiol. Plant., 82, 367-376.
No PubMed abstract available

General Stability

General Stability Organism
xylose protects against thermal inactivation Cucumis sativus

Inhibitors

Inhibitors Comment Organism Structure
Ag+ competitve inhibition Cucumis sativus
beta-D-xylose 43% competitive inhibition at 20 mM for beta-xylosidase A Cucumis sativus
Hg2+ competitive inhibition Cucumis sativus
iodoacetate inhibition of beta-xylosidase A Cucumis sativus
p-chloromercuribenzoate inhibition of beta-xylosidase A Cucumis sativus

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
1.5
-
p-nitrophenyl beta-D-xylopyranoside xylosidase A Cucumis sativus
5.4
-
p-nitrophenyl beta-D-xylopyranoside xylosidase B Cucumis sativus

Localization

Localization Comment Organism GeneOntology No. Textmining
intracellular
-
Cucumis sativus 5622
-

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
68000
-
both beta-xylosidase A and B, SDS-PAGE, gel filtration Cucumis sativus

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
xylo-oligosaccharides + H2O Cucumis sativus beta-xylosidase A beta-D-xylose + ?
-
?
xylo-oligosaccharides + H2O Cucumis sativus derived from xylan beta-D-xylose + ?
-
?

Organism

Organism UniProt Comment Textmining
Cucumis sativus
-
-
-

Posttranslational Modification

Posttranslational Modification Comment Organism
glycoprotein
-
Cucumis sativus

Purification (Commentary)

Purification (Comment) Organism
near homogeneity for beta-xylosidase A, partial for beta-xylosidase B Cucumis sativus

Source Tissue

Source Tissue Comment Organism Textmining
seed
-
Cucumis sativus
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
21.3
-
beta-xylosidase A Cucumis sativus

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
p-nitrophenyl beta-D-xylopyranoside + H2O
-
Cucumis sativus p-nitrophenol + beta-D-xylopyranose
-
?
xylo-oligosaccharides + H2O beta-xylosidase A Cucumis sativus beta-D-xylose + ?
-
?
xylo-oligosaccharides + H2O derived from xylan Cucumis sativus beta-D-xylose + ?
-
?

Synonyms

Synonyms Comment Organism
beta-xylosidase A
-
Cucumis sativus
beta-xylosidase B
-
Cucumis sativus

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
50
-
xylosidase B Cucumis sativus
68
-
xylosidase A Cucumis sativus

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
75
-
inactivated after 30 min Cucumis sativus

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
4.5
-
both xylosidase A and B Cucumis sativus

pH Range

pH Minimum pH Maximum Comment Organism
4 8 fully active, beta-xylosidase A Cucumis sativus

pH Stability

pH Stability pH Stability Maximum Comment Organism
3
-
18% of original activity remains Cucumis sativus