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Revisiting the TALE repeat.

Dong Deng1, Chuangye Yan, Jianping Wu

  • 1State Key Laboratory of Bio-membrane and Membrane Biotechnology, Center for Structural Biology, School of Life Sciences and School of Medicine, Tsinghua-Peking Center for Life Sciences, Beijing, 100084, China.

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This summary is machine-generated.

This study redefines Transcription Activator-Like Effector (TALE) repeat structure for better DNA binding understanding. New structural insights and crystal structures clarify TALE-DNA interactions, aiding TALEN design.

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Area of Science:

  • Structural biology
  • Molecular genetics
  • Protein-DNA interactions

Background:

  • Transcription Activator-Like (TAL) effectors bind double-stranded DNA via tandem repeats.
  • Each TAL effector (TALE) repeat recognizes a specific DNA base through a variable residue.
  • Previous structural studies defined TALE repeat structure, but a revised demarcation is proposed.

Purpose of the Study:

  • To propose a structure-based re-demarcation of the TALE repeat.
  • To elucidate the structural basis for adenine (A) and guanine (G) recognition by TALE codes.
  • To analyze sequence-structure correlations within TALE repeats for improved TALEN design.

Main Methods:

  • Analysis of existing structural data for TALE proteins.
  • Determination of fifteen crystal structures of engineered dHax3 variants complexed with DNA.
  • Sequence-structure correlation analysis of amino acid residues within TALE repeats.

Main Results:

  • A new TALE repeat demarcation is proposed, consistent with the α-solenoid superfamily.
  • The new system provides an integral number of TALE repeats matching bound DNA bases.
  • Crystal structures reveal the molecular basis for adenine and guanine recognition by specific TALE codes.

Conclusions:

  • The proposed TALE repeat re-demarcation enhances mechanistic understanding of TALE proteins.
  • Structural insights facilitate the design of TALENs with improved binding affinity and specificity.
  • This work advances the field of protein engineering for targeted DNA manipulation.