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Evolving a Thermostable Terminal Deoxynucleotidyl Transferase.

Jasmine Puay Suan Chua1,2,3, Maybelle Kho Go1,2, Trina Osothprarop4

  • 1Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, 8 Medical Drive, Singapore 117597.

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Summary
This summary is machine-generated.

Researchers engineered a more heat-stable Terminal deoxynucleotidyl transferase (TdT) enzyme. This thermostable TdT variant maintains its catalytic function and can be used for novel DNA synthesis applications.

Keywords:
TdTmodified nucleotidesprotein engineeringterminal deoxynucleotidyl transferasethermostabilitythermostable TdT

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Area of Science:

  • Enzymology
  • Molecular Biology
  • Biotechnology

Background:

  • Terminal deoxynucleotidyl transferase (TdT) is crucial for template-free DNA synthesis in biotech and clinical settings.
  • Current TdT applications are limited by enzyme instability and inefficient incorporation of modified nucleotides.
  • Engineering TdT for novel DNA synthesis requires a more stable enzyme backbone.

Purpose of the Study:

  • To evolve a thermostable Terminal deoxynucleotidyl transferase (TdT) variant.
  • To establish a foundation for future TdT engineering for modified nucleotide incorporation.
  • To develop a TdT enzyme suitable for high-temperature DNA synthesis applications.

Main Methods:

  • Development of a high-throughput assay for identifying thermostable TdT variants.
  • Screening of approximately 10,000 TdT mutants.
  • Characterization of enzyme thermostability and catalytic activity.

Main Results:

  • Identification of a TdT variant, TdT3-2, exhibiting 10 °C increased thermostability compared to wild-type (WT) TdT.
  • Preservation of WT TdT's catalytic properties in the engineered variant.
  • Successful development of a screening method for thermostable TdT.

Conclusions:

  • The TdT3-2 variant represents a significant advancement in TdT engineering.
  • This thermostable TdT provides a robust platform for developing enzymes with enhanced capabilities for modified nucleotide incorporation.
  • The findings pave the way for improved TdT-mediated DNA synthesis technologies.