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Structural basis of the TAL effector-DNA interaction.

Matthias Bochtler1

  • 1International Institute of Molecular and Cell Biology, Trojdena 4, 02-109 Warsaw, Poland. mbochtler@iimcb.gov.pl

Biological Chemistry
|October 24, 2012
PubMed
Summary

Phytopathogen transcription activator-like effectors (TALEs) bind DNA to control host genes. Recent structural studies reveal how TALE DNA-binding domains decipher the genetic code, uncovering unexpected molecular interactions.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • Transcription activator-like effectors (TALEs) are proteins secreted by phytopathogens.
  • TALEs bind specific DNA sequences to regulate host gene expression.
  • The DNA-binding specificity of TALEs is determined by variable amino acid residues within repetitive domains.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying TALE-DNA interactions.
  • To provide insights into the TALE 'code' that dictates DNA sequence specificity.
  • To summarize TALE biology, applications, and recent structural findings.

Main Methods:

  • X-ray crystallography was used to determine the structures of TALE DNA-binding domains.
  • Analysis of TALE-DNA complex structures to identify key molecular interactions.
  • Review of existing literature on TALE biology and function.

Main Results:

  • TALE repeats form a right-handed superhelix that wraps around B-DNA.
  • Repeat variable residue 1 (RVR1) is crucial for structural stability, not direct DNA base contact.
  • Repeat variable residue 2 (RVR2) mediates sequence-specific contacts with the top DNA strand; bottom strand bases are exposed.

Conclusions:

  • The TALE DNA-binding mechanism involves specific interactions with the top DNA strand and structural stabilization by RVR1.
  • The TALE code is deciphered through a combination of direct RVR2-base contacts and the overall structural arrangement.
  • Understanding these molecular details advances TALE technology applications in research and biotechnology.