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Subunit interactions of the Go protein
L van der Voorn1, T M Hengeveld, H L Ploegh
1Division of Cellular Biochemistry, The Netherlands Cancer Institute, Amsterdam.
FEBS Letters
|August 10, 1992
Summary
The monoclonal antibody MONO binds the G protein alpha o-subunit, facilitating its immunoprecipitation. This binding enhances the affinity of alpha o-GDP for beta gamma subunits, suggesting a novel regulatory mechanism for Go proteins.
Area of Science:
- Biochemistry
- Molecular Biology
- Neuroscience
Background:
- G proteins are key signal transducers.
- Go proteins are involved in various cellular processes.
- Understanding G protein regulation is crucial for cell signaling research.
Purpose of the Study:
- To investigate the interaction of monoclonal antibody MONO with the Go protein.
- To determine the effect of MONO binding on Go protein subunit dissociation.
- To explore the potential regulatory role of MONO in Go protein function.
Main Methods:
- Immunoprecipitation of heterotrimeric Go proteins using monoclonal antibody MONO.
- Incubation of immunoprecipitates with GTP gamma S and GTP to assess subunit dissociation.
- Analysis of Go protein dissociation under varying concentrations and dilution conditions.
Main Results:
- Monoclonal antibody MONO effectively immunoprecipitates Go proteins.
- GTP gamma S induces beta gamma-subunit release from alpha o-subunit, unaffected by MONO.
- GTP failed to induce Go protein dissociation, and dilution did not dissociate MONO-bound Go.
- MONO binding appears to increase the affinity of alpha o-GDP for beta gamma subunits.
Conclusions:
- Monoclonal antibody MONO binds to the G protein alpha o-subunit.
- MONO binding enhances the affinity of alpha o-GDP for beta gamma subunits.
- This enhanced affinity may represent a novel regulatory mechanism for Go protein function.