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Slow Dissociation from the PARP1-HPF1 Complex Drives Inhibitor Potency.

Petra Stojanovic1, Karolin Luger1,2, Johannes Rudolph1

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Poly (ADP-ribose) polymerase inhibitors (PARPi) show increased potency when their dissociation rate from the PARP1-HPF1 complex is slow. This finding guides the development of next-generation PARPi for cancer therapy.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Poly (ADP-ribose) polymerase 1 (PARP1) is crucial for DNA repair via poly ADP-ribosylation (PARylation).
  • HPF1 acts as a cofactor, altering the PARP1 active site and directing PARylation towards histones.
  • The mechanism of PARP1 inhibitor (PARPi) potency, especially with HPF1, remains unclear.

Purpose of the Study:

  • To investigate the binding kinetics of various PARPi to the PARP1-HPF1 complex.
  • To determine the key kinetic parameter correlating with PARPi cellular potency.
  • To guide the rational design of next-generation PARPi.

Main Methods:

  • Measured association rates (k_on) for eight PARPi binding to PARP1.
  • Characterized dissociation rates (k_off) and binding constants (K_D) for specific PARPi with the PARP1-HPF1 complex.
  • Correlated kinetic parameters with in-cell PARPi potency.

Main Results:

  • PARPi association rates (k_on) to PARP1 showed minor differences with or without HPF1.
  • Dissociation half-life for saruparib was 22.5 hours; fluzoparib exhibited higher affinity for PARP1 in the presence of HPF1.
  • PARPi cellular potency strongly correlated with the dissociation rate (k_off) from the PARP1-HPF1 complex.

Conclusions:

  • The dissociation rate from the PARP1-HPF1 complex is a critical determinant of PARPi efficacy.
  • Slower drug dissociation from the PARP1-HPF1 complex is key for enhanced PARPi potency.
  • Dissociation kinetics from the PARP1-HPF1 complex should guide future PARPi drug development.