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Related Experiment Videos

Inhibitors of farnesyltransferase and Ras processing peptidase

C C Hall1, J D Watkins, S B Ferguson

  • 1Department of Oncology, Hoffmann-La Roche Inc., Nutley, NJ 07110-1199, USA.

Biochemical and Biophysical Research Communications
|December 26, 1995
PubMed
Summary

Researchers explored analogs of the p21Ras protein terminus as inhibitors. One naphthyl-substituted peptide analog inhibited both farnesyltransferase and peptidase enzymes involved in Ras processing.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • The p21Ras protein is crucial in cellular signaling pathways.
  • Proper processing of p21Ras involves farnesyltransferase and peptidase enzymes.
  • Inhibiting these enzymes is a target for cancer therapeutics.

Purpose of the Study:

  • To evaluate carboxy-terminal analogs of p21Ras as inhibitors of its processing enzymes.
  • To identify inhibitors with dual activity against farnesyltransferase and peptidase.
  • To understand the implications of dual inhibition on assessing inhibitor mechanisms.

Main Methods:

  • Synthesis of four carboxy-terminal analogs of p21Ras.
  • Enzyme inhibition assays for farnesyltransferase and peptidase.

Related Experiment Videos

  • Determination of IC50 values for active compounds.

    • Main Results:

    • Three analogs exhibited specific inhibitory activity against either farnesyltransferase or peptidase.
    • One naphthyl-substituted peptide analog demonstrated dual inhibitory activity.
    • The dual inhibitor showed IC50 values of 16 microM for farnesyltransferase and 3 microM for peptidase.

    Conclusions:

    • A novel naphthyl-substituted peptide analog inhibits both p21Ras farnesyltransferase and peptidase.
    • Dual inhibition of Ras processing steps can complicate the determination of inhibitor mechanisms.
    • This finding has implications for the development of Ras-targeted therapies.