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Literature summary for 3.2.2.1 extracted from

  • Hassan, M.M.; El-Zainy, T.A.; Alla, A.M.
    Studies of some of the properties of purine nucleoside hydrolase from Aspergillus niger (1979), Egypt. J. Chem., 22, 189-196.
No PubMed abstract available

Activating Compound

Activating Compound Comment Organism Structure
2-mercaptoethanol increases activity Aspergillus niger
GSH increases activity Aspergillus niger

Inhibitors

Inhibitors Comment Organism Structure
EDTA 0.01 M, 28% inhibition. 0.02 M 42% inhibition Aspergillus niger
HgCl2
-
Aspergillus niger
iodoacetate 0.01 M, 25% inhibition. 0.02 M 36.1% inhibition Aspergillus niger

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
4.1
-
Inosine
-
Aspergillus niger
7.5
-
guanosine
-
Aspergillus niger
9
-
adenosine
-
Aspergillus niger

Metals/Ions

Metals/Ions Comment Organism Structure
Mg2+ increases activity Aspergillus niger

Organism

Organism UniProt Comment Textmining
Aspergillus niger
-
-
-

Purification (Commentary)

Purification (Comment) Organism
-
Aspergillus niger

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
4
-
-
Aspergillus niger

Storage Stability

Storage Stability Organism
4°C, 0.1 M citrate buffer, pH 4.0, stable for more than 3 months Aspergillus niger

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
adenosine + H2O
-
Aspergillus niger D-ribose + adenine
-
?
guanosine + H2O
-
Aspergillus niger D-ribose + guanine
-
?
inosine + H2O
-
Aspergillus niger hypoxanthine + D-ribose
-
?

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
60
-
-
Aspergillus niger

Temperature Range [°C]

Temperature Minimum [°C] Temperature Maximum [°C] Comment Organism
30 70 30°C: about 35% of maximal activity, 70°C: about 20% of maximal activity Aspergillus niger

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
60
-
60 min, complete loss of activity. 30 min, 30% loss of activity Aspergillus niger

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
3 4
-
Aspergillus niger

pH Range

pH Minimum pH Maximum Comment Organism
1.5 5.3 about 50% of maximal activity at pH 1.5 and at pH 5.3 Aspergillus niger

pH Stability

pH Stability pH Stability Maximum Comment Organism
8
-
unstale Aspergillus niger