Journeying through the complexities of isothermal amplification research, especially when pinpointing the most suitable Bst enzyme variant for your specific needs, can be an intricate endeavor. With a burgeoning spectrum of Bst types available, making a decision can be overwhelming. Let us shed light on the assorted Bst enzymes and help you identify a variant that flawlessly matches your research goals. The crucial first step is to unequivocally define your project’s objectives since the optimal Bst is inherently linked to them.
Bst DNA Polymerase Large Fragment: For conventional strand displacement reaction
Bst DNA Polymerase Large Fragment is the portion of the Bacillus stearothermophilus DNA Polymerase protein that contains the 5´ → 3´ polymerase activity, but lacks 5´ →3´ exonuclease activity. It has basic strand displacement activity and can be used for isothermal amplification.
However, without further genetic engineering, the amplification speed, impurity tolerance, and specificity of Bst DNA Polymerase (Large Fragment) are not ideal. So we don't recommend this enzyme for most of your experiments.
Bst DNA Polymerase (Large Fragment) is the basic version of Bst
Bst DNA Polymerase: Ideal for isothermal amplification of DNA template
Bst DNA Polymerase is also derived from Bacillus stearothermophilus DNA polymerase I. Its 5 '- 3' exonuclease activity was removed by genetic engineering, while the 5 '- 3' polymerase activity was retained.
As the name suggests, Bst DNA Polymerase has a strong strand-displacement ability for DNA template, so it is an excellent enzyme for isothermal amplification.
Compared with wild-type Bst DNA polymerase (large fragment), Bst DNA Polymerase has been greatly improved in terms of amplification speed, yield, salt tolerance, and thermal stability.
At the same time, Bst DNA Polymerase can be amplified with dUTP as substrate, while Bst DNA Polymerase (Large Fragment) has no such activity.
Bst DNA Polymerase is ideal for the isothermal amplification of DNA template
Bst Polymerase: For isothermal amplification of both DNA and RNA template with a single enzyme system
Bst Polymerase is also derived from Bacillus stearothermophilus DNA polymerase I. Its 5'- 3' and 3'-5' exonuclease activity was removed by genetic engineering, while the 5'- 3' polymerase activity was retained.
Compared with wild-type Bst DNA polymerase (large fragment) and Bst DNA Polymerase, Bst Polymerase has better isothermal amplification activity and stronger reverse transcription activity. Single enzyme system reaction can be realized in the isothermal amplification experiment with RNA as a template.
Bst Polymerase has good reverse transcription activity at 60-65°C, which can effectively solve the reverse transcription of the RNA template with secondary complex structure, while Bst DNA Polymerase and wild-type Bst DNA polymerase (large fragment) do not have this activity.
Bst Polymerase can be used for isothermal amplification of both DNA and RNA template with a single enzyme system
Bst DNA/RNA Polymerase: Ideal for isothermal amplification of RNA template
Bst DNA/RNA Polymerase is suitable for isothermal amplification reaction of both DNA and RNA templates, which can detect low-sensitivity nucleic acid templates with great efficiency and specificity. Besides, with a special preparation process, this enzyme has a fast amplification rate and high tolerance to impurity.
Since Bst DNA/RNA Polymerase is extremely thermostable and also provides sensitive reverse transcriptase activity, it is reported to have higher sensitivity at high Ct values.
Bst DNA/RNA Polymerase is ideal for isothermal amplification of RNA template
Bst P DNA/RNA Polymerase: The most advanced enzyme solution
Bst P DNA/RNA Polymerase is an upgraded version of Bst DNA/RNA Polymerase through enzyme electronic re-structure and evolution screening (in silico Design & in vitro Evolution), which is generally used for LAMP or RT-LAMP amplification of DNA or RNA.
Performance improvements include:
- The whole Bst P DNA/RNA System includes hot start Aptamer, which ensures that the enzyme activity blocking efficiency is >95% at <30°C, and the enzyme activity is completely released within 1 min at >60°C. This characteristic facilitates the establishment of the reaction system at room temperature and greatly reduces the non-specific amplification at low temperatures.
- The reaction temperature is further raised to 70°C, which greatly reduces the formation of primer dimer, improves the amplification specificity, and makes the nucleic acid release of crude samples more sufficient.
- The whole portfolio contains Helicase, so Premium LAMP amplification (pLAMP) is allowed without using F3/B3 primers. At the same time, Helicase has the function of assisting in strand unwinding, which further reduces the concentration of FIP/BIP primers. This will further reduce non-specific amplification and greatly improve amplification homogeneity.
Comparison between the most common Bst DNA Polymerase and the latest Bst P DNA/RNA Polymerase
In conclusion, your selection of a Bst polymerase variant is intrinsically linked to your research goals, each presenting unique capabilities and constraints. We trust this guide will be instrumental in aiding you to choose an enzyme that adeptly aligns with your research pursuits. At SBS Genetech, we offer an extensive variety of Bst polymerase, curated to cater to your diverse requirements.
 Lu S, Duplat D, Benitez-Bolivar P, León C, Villota SD, Veloz-Villavicencio E, et al. (2022) Multicenter international assessment of a SARS-CoV-2 RT-LAMP test for point of care clinical application. PLoS ONE 17(5): e0268340. https://doi.org/10.1371/journal.pone.0268340