Dissecting processing and apoptotic activity of a cysteine protease by mutant analysis
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Published on: March 17, 2010
B Allet1, A Hochmann, I Martinou
1Geneva Biomedical Research Institute, Glaxo Wellcome Research and Development S.A., Switzerland.
Abstract:
We have compared the behavior of wild-type mouse NEDD-2, a neural precursor cell-expressed, developmentally down-regulated cysteine protease gene, to various mutant forms of the gene in both apoptotic activity in neuronal cells and proteolytic cleavage in the Semliki Forest virus and rabbit reticulocyte protein expression systems. Our results confirm that NEDD-2 processing and apoptotic activity are linked phenomena. They identify aspartate residues as likely targets for autocatalytic cleavage. They establish that cleavage events only occur at specific sites. Finally, they pinpoint differential effects of individual mutations on the overall proteolytic cleavage patterns, raising interesting questions related to the mechanisms of subunit assembly.
Insights
We found that NEDD-2 processing and apoptotic activity are linked. Mutations in the NEDD-2 gene affect its proteolytic cleavage patterns, impacting cell death pathways.
Area of Science:
- Molecular Biology
- Neuroscience
- Biochemistry
Background:
- NEDD-2 is a cysteine protease gene expressed in neural precursor cells.
- Its expression is developmentally regulated, decreasing with differentiation.
- Understanding NEDD-2's function is crucial for neural development and apoptosis research.
Purpose of the Study:
- To compare wild-type mouse NEDD-2 with mutant forms.
- To investigate the relationship between NEDD-2 processing and apoptotic activity in neuronal cells.
- To identify specific cleavage sites and the impact of mutations on proteolytic patterns.
Main Methods:
- Utilized protein expression systems (Semliki Forest virus and rabbit reticulocyte).
- Analyzed apoptotic activity in neuronal cells with wild-type and mutant NEDD-2.
- Examined proteolytic cleavage patterns of NEDD-2.
Main Results:
- Confirmed a link between NEDD-2 processing and apoptotic activity.
- Identified aspartate residues as probable sites for autocatalytic cleavage.
- Demonstrated that cleavage occurs only at specific sites.
- Observed differential effects of mutations on proteolytic cleavage patterns.
Conclusions:
- NEDD-2 processing is intrinsically connected to its role in apoptosis.
- Specific aspartate residues are critical for NEDD-2 autocatalysis.
- Mutations can alter NEDD-2's proteolytic activity, providing insights into subunit assembly mechanisms.
