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Related Experiment Videos

Substrate assisted catalysis -- application to G proteins.

M Kosloff1, Z Selinger

  • 1Department of Biological Chemistry, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Trends in Biochemical Sciences
|March 14, 2001
PubMed
Summary
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Substrate-assisted catalysis (SAC) in G proteins uses GTP. Engineered SAC identified a rate-limiting step, showing oncogenic Ras mutants aren't irreversibly impaired, suggesting new anti-cancer drug strategies.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzyme kinetics

Background:

  • Guanine nucleotide-binding proteins (G proteins) are crucial molecular switches.
  • Substrate-assisted catalysis (SAC) is a mechanism where both enzyme and substrate participate in catalysis.
  • Naturally occurring SAC in G proteins utilizes guanosine triphosphate (GTP) as a general base.

Purpose of the Study:

  • To investigate the role and engineering of SAC in G protein function.
  • To identify rate-limiting steps in the GTPase reaction catalyzed by G proteins.
  • To explore therapeutic strategies for GTPase-deficient oncogenic Ras mutants.

Main Methods:

  • Utilizing engineered SAC to probe the GTPase reaction mechanism.
  • Analyzing the kinetics of GTP hydrolysis in G proteins.

Related Experiment Videos

  • Characterizing the functional status of oncogenic Ras mutants.

    • Main Results:

    • Engineered SAC pinpointed a putative rate-limiting step in the GTPase reaction.
    • GTPase-deficient oncogenic Ras mutants were found not to be irreversibly impaired.
    • Demonstrated the potential for modulating G protein activity through engineered SAC.

    Conclusions:

    • SAC is a viable mechanism for understanding and potentially manipulating G protein function.
    • Targeting the identified rate-limiting step could restore GTPase activity in certain mutants.
    • This research opens avenues for developing novel anti-cancer therapeutics by restoring G protein function.