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Updated: May 5, 2026

Examination of Thymic Positive and Negative Selection by Flow Cytometry
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TAL effectors specificity stems from negative discrimination.

Basile I M Wicky1, Marco Stenta, Matteo Dal Peraro

  • 1Laboratory for Biomolecular Modeling, Institute of Bioengineering, School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.

Plos One
|November 28, 2013
PubMed
Summary
This summary is machine-generated.

Transcription Activator-Like (TAL) effectors bind plant DNA. New research clarifies how their Repeat Variable Diresidue (RVD) sequences determine specificity, enabling improved TAL-based genome engineering tools.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Transcription Activator-Like (TAL) effectors are bacterial proteins that bind plant DNA promoters.
  • Their DNA-binding specificity is determined by Repeat Variable Diresidue (RVD) sequences.
  • TAL effectors are crucial tools in genome engineering.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying TAL effector DNA-binding specificity.
  • To understand the role of RVDs and non-variable residues in DNA recognition.
  • To develop a predictive model for TAL effector-DNA interactions.

Main Methods:

  • Molecular simulations of TAL effector-DNA complexes.
  • Analysis of protein-DNA binding energies and dynamics.
  • Development of a pharmacophore-like model for RVD-DNA interactions.

Main Results:

  • Non-specific DNA backbone interactions contribute significantly to binding energy.
  • The first RVD residue facilitates DNA helix folding, while the second confers specificity.
  • A model explaining RVD-DNA interactions and binding affinities was proposed.

Conclusions:

  • The study provides a deeper understanding of TAL effector DNA-binding specificity.
  • The proposed model aids in interpreting experimental data and predicting binding.
  • This work facilitates the rational design of enhanced TAL-derived genome engineering tools.