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Related Experiment Videos

Dependence of McrBC cleavage on distance between recognition elements

F J Stewart1, E A Raleigh

  • 1New England Biolabs, Beverly, MA 01915, USA.

Biological Chemistry
|June 17, 1998
PubMed
Summary

The restriction enzyme McrBC efficiently cleaves DNA when its recognition sites are optimally spaced between 55-103 basepairs apart. This enzyme shows broad spacing tolerance, indicating DNA flexibility is key for McrBC DNA cleavage.

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Area of Science:

  • Molecular Biology
  • Enzymology
  • Genetics

Background:

  • The modification-dependent restriction enzyme McrBC plays a role in DNA restriction.
  • McrBC-mediated DNA cleavage is contingent upon the presence and spacing of two modified recognition elements.

Purpose of the Study:

  • To precisely define the DNA spacing requirements for McrBC activity.
  • To investigate the impact of varying distances between recognition sites on cleavage efficiency.

Main Methods:

  • Construction of a plasmid with a single McrBC cleavage site.
  • Systematic variation of the distance between McrBC recognition elements.
  • Assessment of DNA cleavage efficiency at different spacings.

Main Results:

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  • Optimal DNA cleavage by McrBC occurred with element spacing between 55 and 103 basepairs.
  • Detectable cleavage was observed across a wide range of spacings (32 bp to 2 kb).
  • No cleavage was observed at spacings of 22 bp or less, or at 3 kb, indicating specific spatial constraints.

Conclusions:

  • The spacing between McrBC recognition elements significantly influences cleavage efficiency.
  • The enzyme tolerates substantial variation in spacing, suggesting DNA flexibility is important.
  • The lack of sensitivity to minor spacing changes (e.g., 4 bp) implies recognition elements do not require precise helical positioning.