ENGINEERED TdT VARIANT
TdT for blocked nucleotides is an engineered terminal deoxynucleotidyl transferase designed to efficiently incorporate modified or blocked deoxynucleotides (3′-NH₂ blocked dNTPs) to the 3' end of DNA strands.
Built for researchers developing controlled extension, iterative enzymatic DNA synthesis, ssDNA end labeling, and barcoding workflows, this TdT gives teams an option for controlled synthesis using amino-blocked nucleotides.
DNA synthesis
3′-amino blocked nucleotide incorporation
ssDNA end labeling and extension
DNA tagging
TdT for blocked nucleotides gives researchers access to one of Kura Biotech’s engineered TdT variants in a standalone format. It is designed for teams working with 3′-amino blocked nucleotides who need a focused enzyme option for method development, optimization, or continued use after panel screening.
This TdT was designed to incorporate 3′-amino blocked nucleotides, which makes it well-suited for workflows that rely on reversible blocking strategies.
Relevant for methods where nucleotide addition needs to be compatible with iterative or stepwise workflows, such as controlled tailing and enzymatic DNA synthesis methods.
Work directly with our team to discuss nucleotide chemistry, reaction conditions, and next-step optimization.
Product Type: All-In-One / MasterMix
Polymerase: DeCodiFi™ Alpha Hotstart High-Fidelity Polymerase
Format: 5 mL
Reactions: 400
Storage: -20°C
Standalone engineered TdT variant
Best for:
Teams working controlled DNA synthesis workflows using 3′-amino blocked nucleotides.
Six engineered TdT variants for workflow screening
Best for:
Teams that are still identifying which TdT variant is best suited to their nucleotide chemistry or application.
If you are comparing nucleotide chemistries, working outside 3′-amino blocked nucleotides, or unsure whether TdT for blocked nucleotides is the right starting point, begin with the TdT Synthesis Panel.
PERFORMANCE DATA
DeCodiFi™ Alpha shows an ultra-high fidelity profile in an Illumina library-based comparison of polymerase error rates, supporting workflows where polymerase-introduced errors can affect downstream interpretation.
HIGHER FIDELITY
Comparison of DeCodiFi™ Alpha 2X All-In-One Mix, Kura DeCodiFi™ 2X All-In-One Mix, Q5® High-Fidelity 2X Master Mix, Watchmaker Equinox Library Amplification Kit, Roche KAPA HiFi HotStart ReadyMix, and Taq, measured in error per million based on Illumina libraries of the complete E. coli genome.
DeCodiFi™ Alpha supports uniform coverage across tested genomic regions, helping reduce GC-related coverage bias during NGS library amplification.
UNIFORM COVERAGE
Illumina libraries prepared from an E. coli genome were amplified using DeCodiFi™ Alpha 2X All-In-One Mix, DeCodiFi™ 2X All-In-One Mix, Q5® High-Fidelity 2X Master Mix, and Taq polymerase.
APPLICATIONS
For synthesis workflows that require repeatable TdT performance across multiple extension cycles.
For workflows that depend on efficient one-by-one incorporation of 3′-NH₂ blocked dNTPs and reversible blocking strategies.
Carlos Loncoman, Ph.D.
Assistant Professor, Universidad Austral de Chile
Cristian Droppelmann, Ph.D.
Research Associate/Team Leader, The University of Western Ontario
Paola Krall, Ph.D.
Academic, Universidad de Chile
Ignacio Valencia
Researcher, Platech Company
SUPPORT
TdT for blocked nucleotides is designed to incorporate 3′-amino blocked deoxynucleotides (3′-NH₂ blocked dNTPs) to the 3' hydroxyl terminus of DNA molecules.
Choose TdT for blocked nucleotides if you already know that 3′-amino blocked nucleotide compatibility is central to your workflow, or if this TdT has already been identified as the preferred variant during screening.
Choose the TdT Synthesis Panel if you are still comparing nucleotide chemistries, evaluating multiple TdT variants, or unsure which enzyme background is best suited to your application.
No. TdT for blocked nucleotides is not designed to incorporate 3′-phosphate or 3′-azidomethyl blocked nucleotides. If you are working with other chemistries, we recommend starting with the TdT Synthesis Panel or discussing your application with our team.
Yes, we can engineer a TdT variant to work with other nucleotide chemistries. If you are interested, please discuss your application with our team.
Yes, TdT for blocked nucleotides is designed for iterative enzymatic DNA synthesis workflows that use 3′-amino blocked nucleotides and require controlled extension across repeated cycles.
Yes, TdT for blocked nucleotides can be considered for ssDNA end-labeling and extension workflows where 3′-amino blocked nucleotide incorporation is part of the method.
RNA-end workflows should be discussed with our technical team before evaluation. TdT for blocked nucleotides is best positioned for DNA workflows involving 3′-amino blocked nucleotides.
Yes. Our technical team can discuss your nucleotide chemistry, reaction setup, blocking strategy, deblocking conditions, and downstream workflow requirements.
If your team is moving from evaluation to recurring use, we can discuss format options, supply planning, and scale-up needs.
For general high-fidelity PCR and sequencing workflows.


