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Related Experiment Videos

Structural determinants for specific recognition by T4 endonuclease V

A K McCullough1, O Schärer, G L Verdine

  • 1Sealy Center for Molecular Science and Department of Human Biological Chemistry & Genetics, University of Texas Medical Branch, Galveston, Texas 77555-1071, USA.

The Journal of Biological Chemistry
|December 13, 1996
PubMed
Summary
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Modulation of the turnover of formamidopyrimidine DNA glycosylase.

Biochemistry·2006

T4 endonuclease V recognizes UV-damaged DNA via a positively charged pyrrolidine residue in a synthesized inhibitor. This study reveals key DNA structural determinants for T4 endonuclease V recognition.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • DNA glycosylases remove damaged DNA bases.
  • T4 endonuclease V specifically targets UV-induced pyrimidine dimers.
  • Understanding enzyme-DNA interactions is crucial for DNA repair mechanisms.

Purpose of the Study:

  • To synthesize and characterize a transition state analog/inhibitor for glycosylases.
  • To investigate the role of positive charge in T4 endonuclease V binding specificity.
  • To elucidate the structural basis of DNA lesion recognition by T4 endonuclease V.

Main Methods:

  • Synthesis of a phosphoramidite derivative containing a pyrrolidine residue.
  • Gel mobility shift assays to analyze protein-DNA complex formation.

Related Experiment Videos

  • Affinity studies using wild-type and mutant T4 endonuclease V with non-cleavable analogs.

    • Main Results:

    • A stable T4 endonuclease V-inhibitor complex formed with a dissociation constant (Kd) of 17 nM.
    • The positive charge of the pyrrolidine residue is critical for high-affinity binding.
    • Catalytically compromised mutants exhibited altered binding affinities for various analogs.

    Conclusions:

    • The positive charge on the pyrrolidine moiety is essential for T4 endonuclease V's specific recognition of DNA lesions.
    • Structural determinants of DNA are vital for specific protein binding.
    • This study provides insights into the mechanism of DNA repair targeting.