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Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
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A Cdc7 kinase inhibitor restricts initiation of DNA replication and has antitumor activity

Alessia Montagnoli1, Barbara Valsasina, Valter Croci

  • 1Nerviano Medical Sciences Oncology, Via Pasteur 10, 20014 Nerviano, Italy.

Nature Chemical Biology
|May 13, 2008
PubMed

Insights

A new drug, PHA-767491, effectively inhibits cell division kinase 7 (Cdc7) to block cancer cell DNA replication. This targeted approach shows promise for novel anticancer therapeutics by preventing cancer origin activation.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Oncology

Background:

  • Cell division kinase 7 (Cdc7) is crucial for initiating DNA replication by activating replication origins.
  • Targeting DNA replication is a validated strategy in cancer therapy.

Purpose of the Study:

  • To characterize the Cdc7 inhibitor PHA-767491.
  • To evaluate its efficacy as an anticancer therapeutic in preclinical models.

Main Methods:

  • Biochemical and cell-based assays were employed to study PHA-767491.
  • In vivo antitumor activity was assessed in rodent cancer models.
  • Effects on DNA synthesis, origin activation, and DNA damage response were analyzed.

Main Results:

  • PHA-767491 potently inhibits Cdc7 kinase activity.
  • The compound blocks DNA synthesis by preventing replication origin activation without impeding fork progression.
  • PHA-767491 induces apoptotic cell death in cancer cells and inhibits tumor growth in vivo.
  • Unlike other DNA synthesis inhibitors, it does not trigger a sustained DNA damage response.

Conclusions:

  • PHA-767491 is the first molecule identified to specifically inhibit the initiation phase of DNA replication.
  • Cdc7 kinase inhibition represents a novel and promising strategy for developing new anticancer drugs.

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