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A bifunctional molecule that displays context-dependent cellular activity.

Patrick D Braun1, Katherine T Barglow, Yun-Ming Lin

  • 1Department of Chemistry, Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA.

Journal of the American Chemical Society
|June 19, 2003
PubMed
Summary
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A novel bifunctional molecule, MTXSLF, inhibits dihydrofolate reductase (DHFR). Its efficacy is modulated by FKBP binding, demonstrating a new strategy for controlling drug activity.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Dihydrofolate reductase (DHFR) is a key enzyme in folate metabolism, essential for DNA synthesis.
  • Methotrexate (MTX) is a potent DHFR inhibitor used in chemotherapy.
  • FKBP is a protein involved in various cellular processes, known to bind specific ligands.

Purpose of the Study:

  • To design and synthesize a bifunctional molecule (MTXSLF) linking methotrexate to an FKBP ligand.
  • To investigate the impact of FKBP on the inhibitory activity of MTXSLF against human and Plasmodium falciparum DHFR.
  • To explore a novel strategy for modulating drug efficacy through interactions with a non-target protein.

Main Methods:

  • Chemical synthesis of the bifunctional molecule MTXSLF.

Related Experiment Videos

  • In vitro enzymatic assays to assess DHFR inhibition.
  • In vivo experiments in relevant models to evaluate drug efficacy and FKBP influence.

    • Main Results:

    • MTXSLF effectively inhibits human DHFR in vitro.
    • The presence of human FKBP significantly reduces MTXSLF efficacy against human DHFR due to high affinity and concentration.
    • MTXSLF inhibits Plasmodium falciparum DHFR in vitro, with minimal impact from Plasmodium FKBP in vivo.

    Conclusions:

    • The design of MTXSLF demonstrates a strategy to control drug activity by leveraging interactions with a secondary protein (FKBP).
    • The binding affinity and concentration of the non-target protein (FKBP) are critical factors in modulating the efficacy of bifunctional molecules.
    • This approach offers a versatile platform for fine-tuning the biological activity of synthetic compounds.