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Repressible alkaline phosphatase in Aspergillus niger
Experientia
|January 1, 1976
Summary
Alkaline phosphatase (ALP) from Aspergillus niger is regulated by phosphate and zinc. EDTA inhibits this enzyme, but zinc and magnesium can restore its activity.
Area of Science:
- Biochemistry
- Enzymology
- Microbial Physiology
Background:
- Alkaline phosphatase (ALP) is a crucial enzyme involved in various biological processes.
- Understanding the regulation of microbial ALP is essential for biotechnological applications.
Purpose of the Study:
- To investigate the regulatory properties of alkaline phosphatase (ALP) from Aspergillus niger.
- To compare the metal ion dependency of Aspergillus niger ALP with that of Neurospora crassa.
Main Methods:
- Enzyme assays were performed to determine the activity of ALP.
- The effects of phosphate, zinc ions (Zn++), and EDTA on enzyme activity were assessed.
- Reversibility of EDTA inhibition by metal ions was investigated.
Main Results:
- Aspergillus niger ALP was found to be a phosphate-repressible enzyme.
- Enzyme activity was significantly stimulated by the addition of zinc ions to the growth medium.
- EDTA caused reversible inhibition of ALP, which could be restored by zinc and potentially magnesium ions.
Conclusions:
- Aspergillus niger ALP exhibits distinct regulatory mechanisms involving phosphate and specific metal ions.
- The metal ion dependency of Aspergillus niger ALP differs significantly from the metal-independent ALP of Neurospora crassa.
- These findings provide insights into the biochemical characteristics and regulation of microbial alkaline phosphatases.