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    ENGINEERED TdT VARIANT  

TdT for blocked nucleotides

Engineered TdT for 3′-amino blocked nucleotide workflows

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

Product Overview

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.

Why TdT F

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Built for blocked nucleotide workflows

This TdT was designed to incorporate 3′-amino blocked nucleotides, which makes it well-suited for workflows that rely on reversible blocking strategies.

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Supports controlled extension

Relevant for methods where nucleotide addition needs to be compatible with iterative or stepwise workflows, such as controlled tailing and enzymatic DNA synthesis methods.

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Technical support included

Work directly with our team to discuss nucleotide chemistry, reaction conditions, and next-step optimization.

Product format

OPTIMIZED FOR ACCURATE LIBRARY AMPLIFICATION
DeCodi-Fi™ Alpha
2X All-In-One Mix


Provides our DeCodi-Fi™ high-fidelity polymerase in a 2X MasterMix optimized for NGS library amplification. This mix includes all essential PCR components: dNTPs, MgCl₂, and stabilizers, within a proprietary buffer designed to enhance fidelity and coverage. Just add primers and template.

  • Product Type: All-In-One / MasterMix

  • Polymerase: DeCodiFi™ Alpha Hotstart High-Fidelity Polymerase

  • Format: 5 mL

  • Reactions: 400

  • Storage: -20°C

Choose your starting point

If your workflow is centered on 3′-amino blocked nucleotides, TdT F is the focused standalone enzyme to evaluate. If you are still comparing nucleotide chemistries or not sure which engineered TdT variant fits best, start with the TdT Synthesis Panel.

TdT F

Standalone engineered TdT variant


Best for:
Teams working controlled DNA synthesis workflows using 3′-amino blocked nucleotides. 

TdT Synthesis Panel

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. 

Not sure yet? Start with the panel.

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

Evidence-based performance

 

Polymerase error rate in Illumina library amplification

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 Kura 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.

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.

Coverage uniformity across GC content

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 Kura DeCodiFi™ Alpha 2X All-In-One Mix, Kura DeCodiFi™ 2X All-In-One Mix, Q5® High-Fidelity 2X Master Mix, and Taq polymerase.

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

Controlled DNA synthesis & modified nucleotide workflows

TdT for blocked nucleotides supports workflows where 3′-amino blocked nucleotide incorporation, controlled extension, and enzyme fit are critical to moving beyond standard TdT.

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Iterative enzymatic DNA synthesis

For synthesis workflows that require repeatable TdT performance across multiple extension cycles.

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3′-amino blocked nucleotide incorporation

For workflows that depend on efficient one-by-one incorporation of 3′-NH₂ blocked dNTPs and reversible blocking strategies.

 

RESOURCES

Technical Documentation

Technical Data Sheet / Protocol

DeCodi-Fi™ All-In-One Mix TDS / Protocol

VIEW 


DeCodi-Fi™ All-In-One Mix TDS / Protocol

VIEW 

Brochure

Quick Start Guides

DeCodi-Fi™ All-In-One Mix Quick Start Guide

VIEW


DeCodi-Fi™ PCR Kit Quick Start Guide

VIEW

 

Testimonials

Recurso 29-3
Kura Biotech's enzyme generates more homogeneous products, requires less template to amplify, and also needs shorter extension times in each amplification cycle. Therefore, it is more efficient and has proofreading activity that enables the generation of more homogeneous products.

Carlos Loncoman, Ph.D.

Assistant Professor, Universidad Austral de Chile
Recurso 24-4
I just tested DeCodi-Fi™ and compared it to the one I regularly use in the lab for cloning. The yield (amount of product) is higher, and without a doubt, I can say that I like the product because it is so simple and fast to work with, while also giving me confidence that it is a high-fidelity enzyme. The kit is very easy to use since everything comes ready to go, which is really convenient.

Cristian Droppelmann, Ph.D.

Research Associate/Team Leader, The University of Western Ontario
Recurso 12-Oct-13-2025-05-48-14-6057-PM
I want to highlight the speed of the PCR—it shortens the reaction time by about 20–30 minutes. The PCR product yield is great, making it easy to identify the desired fragment. I'm very satisfied with the product. One of the diseases I study involves a candidate gene with high GC content and pseudogenes, which makes PCR quite challenging. I work with limited amounts of DNA and still achieve high yields of the desired product. When dealing with patient samples, where material is low, that's a major advantage.

Paola Krall, Ph.D.

Academic, Universidad de Chile
platech-logo
Kura Biotech's enzyme is of excellent quality and surpasses many of the options currently available on the market. The objective of the experiment was to generate a plasmid encoding a truncated protein using the overlap PCR technique. The results with DeCodi-Fi™ were very positive: we managed to correctly generate the desired plasmid, and the PCRs were fast and consistent. No errors or aberrant products were observed at any point in the process.

Ignacio Valencia

Researcher, Platech Company

SUPPORT

Frequently Asked Questions

 

What is TdT for blocked nucleotides?

TdT for blocked nucleotides is a standalone engineered terminal deoxynucleotidyl transferase developed for workflows that require efficient 3′-amino blocked nucleotide incorporation.

What type of nucleotides can incorporate TdT for blocked nucleotides?

TdT for blocked nucleotides is designed to incorporate 3′-amino blocked deoxynucleotides (3′-NH₂ blocked dNTPs) to the 3' hydroxyl terminus of DNA molecules. 

When should I choose TdT for blocked nucleotides instead of the TdT Synthesis Panel?

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.

Can I use TdT for blocked nucleotides with 3′-phosphate or 3′-azidomethyl blocked nucleotides?

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.

Can you adapt a TdT to use 3′-phosphate, 3′-azidomethyl, or other blocked nucleotides?

Yes, we can engineer a TdT variant to work with other nucleotide chemistries. If you are interested, please discuss your application with our team.

Is TdT for blocked nucleotides suitable for iterative enzymatic DNA synthesis?

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.

Can TdT for blocked nucleotides be used for ssDNA end labeling?

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.

Can TdT for blocked nucleotides be used for RNA-end labeling?

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.

Can your team help optimize my reaction conditions?

Yes. Our technical team can discuss your nucleotide chemistry, reaction setup, blocking strategy, deblocking conditions, and downstream workflow requirements.

Is TdT for blocked nucleotides available in larger or recurring formats?

If your team is moving from evaluation to recurring use, we can discuss format options, supply planning, and scale-up needs.

CONTACT US

See how TdT for blocked nucleotides performs in your workflow

Whether you are ready to evaluate TdT for blocked nucleotides, compare it against the TdT Synthesis Panel, or discuss optimization for your nucleotide chemistry, our team can help you choose the right next step.

 

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