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Type III restriction-modification enzymes use ATP hydrolysis for DNA sliding, enabling long-range interactions. This study reveals the helicase-like domain

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Enzymology

Background:

  • Type III restriction-modification enzymes cleave bacteriophage DNA through long-range DNA site interactions.
  • These interactions are mediated by one-dimensional diffusion, or 'DNA sliding', powered by ATP hydrolysis.
  • A superfamily 2 helicase-like ATPase drives this process, but its precise roles remain incompletely understood.

Purpose of the Study:

  • To investigate the multifaceted roles of ATP hydrolysis by the helicase-like domain in Type III enzyme function.
  • To elucidate the mechanism of DNA sliding and long-range communication between DNA sites.

Main Methods:

  • Ultrafast twist measurements using plasmonic DNA origami nano-rotors.
  • Stopped-flow fluorescence assays.
  • Gel-based assays to analyze DNA interactions and enzyme activity.

Main Results:

  • The helicase-like domain stabilizes initial DNA binding with methyltransferase subunits.
  • ATP hydrolysis induces environmental changes in adenine bases and remodels nucleoprotein complexes.
  • Constrained translocation of a DNA loop (5-22 bp) is mediated by the helicase domain.
  • DNA sliding initiation requires 8-15 bp downstream of the motor, aligning with nuclease domain binding.

Conclusions:

  • The helicase-like ATPase domain plays multiple critical roles beyond simple DNA translocation.
  • This study unifies previous, often contradictory, models of communication within Type III restriction-modification enzyme systems.
  • The findings provide a comprehensive mechanistic understanding of how these enzymes achieve long-range DNA targeting.