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Multiple intracellular peptidases in Neurospora crassa
Journal of Bacteriology
|March 1, 1979
Summary
Neurospora crassa has multiple intracellular peptidases with overlapping functions. Peptidase II, a metalloenzyme, shows broad specificity, particularly for tripeptides and methionine-containing peptides.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Neurospora crassa exhibits diverse intracellular peptidases with overlapping substrate specificities.
- Understanding these enzymes is crucial for elucidating fundamental cellular processes.
Purpose of the Study:
- To identify and characterize intracellular peptidases in Neurospora crassa.
- To investigate the properties of a specific aminopeptidase, Peptidase II.
Main Methods:
- In situ staining of peptidases separated by polyacrylamide gel electrophoresis.
- Enzyme purification and characterization of Peptidase II.
- Assessing substrate specificity and inhibition patterns.
Main Results:
- Eleven distinct intracellular peptidases were identified.
- Most peptide substrates were hydrolyzed by multiple peptidases.
- Peptidase II, an aminopeptidase, demonstrated broad activity, preferring tripeptides and methionine-containing peptides.
- Peptidase II is a thermolabile metalloenzyme sensitive to sulfhydryl group modification.
Conclusions:
- Multiple peptidases in Neurospora crassa likely have overlapping roles in cellular functions.
- Peptidase II is a significant aminopeptidase with unique biochemical properties, potentially involving a metallo-cofactor and essential sulfhydryl group.