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Structure and function of type II restriction endonucleases.

A Pingoud1, A Jeltsch

  • 1Institut für Biochemie (FB 08), Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392 Giessen, Germany. alfred.m.pingoud@chemie.bio.uni-giessen.de

Nucleic Acids Research
|September 15, 2001
PubMed
Summary
This summary is machine-generated.

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Type II restriction enzymes are crucial DNA-cutting tools. They bind DNA non-specifically before locating and cleaving specific recognition sites, utilizing a common structural core and a PD. D/EXK motif for catalysis.

Area of Science:

  • Molecular Biology
  • Enzymology
  • Structural Biology

Background:

  • Over 3000 type II restriction endonucleases are known, recognizing specific DNA sequences (4-8 bp) and cleaving DNA in the presence of Mg(2+).
  • These enzymes are typically homodimers recognizing palindromic sites, with conserved structural cores (four beta-strands, one alpha-helix) and two main structural families (EcoRI-like, EcoRV-like).

Purpose of the Study:

  • To elucidate the structural and mechanistic aspects of type II restriction endonuclease function.
  • To describe the DNA binding and cleavage mechanisms of these enzymes.

Main Methods:

  • Structural analysis of restriction enzymes.
  • Biochemical characterization of DNA binding and cleavage.

Main Results:

Related Experiment Videos

  • Restriction enzymes exhibit non-specific DNA binding via the backbone for target site location, transitioning to specific binding involving base and backbone interactions.
  • Specific binding involves extensive hydrogen bonds (approx. 15-20) and van der Waals contacts, triggering conformational changes and activating catalytic centers.
  • The PD. D/EXK motif is central to catalysis, coordinating Mg(2+) for DNA cleavage, though the exact number of Mg(2+) ions involved remains uncertain.

Conclusions:

  • Type II restriction enzymes employ a dual binding strategy (non-specific and specific) for efficient DNA recognition and cleavage.
  • The conserved structural features and catalytic motifs underpin the diverse functions of these essential molecular tools.
  • Further research is needed to fully define the precise catalytic mechanism and the role of Mg(2+) in DNA cleavage.