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Roles of Meltrin beta /ADAM19 in the processing of neuregulin
K Shirakabe1, S Wakatsuki, T Kurisaki
1Department of Cell Biology, The Tokyo Metropolitan Institute of Medical Science, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo 113-8613, Japan.
The Journal of Biological Chemistry
|December 26, 2000
Summary
Meltrin beta (ADAM19) processes neuregulin-1 (NRG) beta isoforms. This ADAM protein enhances NRG-beta1 shedding, suggesting a role in regulating NRG signaling pathways during development.
Area of Science:
- Molecular Biology
- Cell Biology
- Developmental Biology
Background:
- Meltrin beta (ADAM19) is a metalloprotease involved in various biological processes.
- Meltrin beta expression patterns overlap with neuregulin-1 (NRG) during mouse development.
Purpose of the Study:
- To investigate the role of meltrin beta in the proteolytic processing of membrane-anchored neuregulin-1 (NRG).
Main Methods:
- Expression of NRG-beta1 in mouse L929 cells.
- Overexpression of wild-type and protease-deficient meltrin beta mutants.
- Analysis of NRG-beta1 processing and cell surface exposure.
- Testing effects of secretory pathway inhibitors.
Main Results:
- Meltrin beta potentiated the processing and release of NRG-beta1's extracellular domain.
- Overexpression of meltrin beta decreased cell surface exposure of NRG-beta1.
- Protease-deficient meltrin beta mutants inhibited basal NRG-beta1 processing.
- Meltrin beta showed substrate preference for NRG-beta isoforms over NRG-alpha2.
- Evidence suggests intracellular processing of NRGs by meltrin beta.
Conclusions:
- Meltrin beta plays a significant role in the proteolytic processing of neuregulin-1 beta isoforms.
- Meltrin beta likely functions intracellularly to regulate NRG processing and signaling.