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Related Experiment Videos

Structural basis for stable DNA complex formation by the caspase-activated DNase.

Stefanie Reh1, Christian Korn, Oleg Gimadutdinow

  • 1Institute of Biochemistry, Faculty of Biology and Chemistry, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany.

The Journal of Biological Chemistry
|October 21, 2005
PubMed
Summary

We propose a structural model for DNA binding by caspase-activated DNase (CAD). DNA interacts with CAD through two distinct positively charged regions, one in the active site and another on helix alpha4, for minor and major groove binding, respectively.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Caspase-activated DNase (CAD) is a key enzyme involved in DNA fragmentation during apoptosis.
  • Understanding CAD's DNA binding mechanism is crucial for elucidating its role in programmed cell death.

Purpose of the Study:

  • To elucidate the structural model of DNA binding by caspase-activated DNase (CAD).
  • To identify the specific regions of CAD involved in DNA interaction.

Main Methods:

  • Utilized mutational analysis to probe protein-DNA interactions.
  • Employed computational modeling to predict and visualize the structural complex.

Main Results:

  • Identified a positively charged surface on CAD responsible for DNA binding.

Related Experiment Videos

  • Discovered two functionally distinct DNA binding regions: one at the active site (minor groove) and another involving helix alpha4 (major groove).
  • Observed this bipartite interaction in both the CAD/inhibitor of CAD heterodimer and the active CAD dimer.

    • Conclusions:

    • The study presents a novel structural model for CAD-DNA interaction.
    • CAD employs a bipartite binding strategy, engaging both DNA grooves via distinct surface regions.
    • This interaction mode is conserved across different CAD complex formations.