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DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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A simple cipher governs DNA recognition by TAL effectors.

Matthew J Moscou1, Adam J Bogdanove

  • 1Department of Plant Pathology and Bioinformatics and Computational Biology Program, Iowa State University, Ames, IA 50011, USA.

Science (New York, N.Y.)
|November 26, 2009
PubMed
Summary
This summary is machine-generated.

TAL effectors from Xanthomonas bacteria bind host DNA to cause disease. A repeat-variable residue pair in TAL effectors directly determines DNA target specificity, revealing a novel recognition mechanism.

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Area of Science:

  • Molecular Biology
  • Plant Pathology
  • Genetics

Background:

  • TAL effectors are proteins secreted by Xanthomonas bacteria that bind to host plant DNA.
  • These effectors play a crucial role in plant pathogenesis by activating or suppressing host genes.
  • The specificity of TAL effector DNA binding is determined by variable repeats, but the recognition mechanism remains unclear.

Purpose of the Study:

  • To elucidate the mechanism by which TAL effectors recognize and bind specific DNA target sites.
  • To understand how the variable repeats within TAL effectors confer DNA target specificity.
  • To explore the potential applications of this understanding in research and biotechnology.

Main Methods:

  • Analysis of the structural and functional relationship between TAL effector repeat regions and their DNA targets.
  • Site-directed mutagenesis of repeat-variable residues to assess their impact on DNA binding specificity.
  • In vitro and in vivo assays to confirm DNA-protein interactions and functional consequences.

Main Results:

  • A direct correlation was established between a specific pair of residues within each TAL effector repeat and the targeted DNA nucleotide.
  • This residue-nucleotide pairing functions independently of the surrounding DNA sequence context.
  • The findings reveal a previously undescribed mechanism for protein-DNA recognition.

Conclusions:

  • The study identifies a simple, direct code for TAL effector DNA binding specificity based on repeat-variable residues.
  • This mechanism explains how TAL effectors achieve precise DNA targeting.
  • The findings enable accurate prediction of TAL effector target sites and open avenues for novel biotechnological tools.