GScript RTase

Catalog No.: SM303-0050

Size: 50 Reactions

The GScript RTase is recombinant M-MLV RTase expressed in E. coli and purified to homogeneity. It has lower RNase H activity and high thermal stability. The enzyme is widely used to synthesize first-strand cDNA at temperatures up to 55°C with increased specificity, higher yields of cDNA, and more full-length product than other reverse transcriptases. It can generate cDNA from 100 bp to 12 Kb.


First-Strand cDNA Synthesis

1. In a sterile microfuge tube, first add:

  •     RNA solution (10 pg~5 μg total RNA or 10 pg~500 ng mRNA)
  •     1 μl oligo(dT)20 (50 μM), or other primers
  •     1 μl 10 mM dNTP Mix
  •     nuclease-free H2O to final volume of 13 μl
  • 2. Heat for 3-5 minutes at 65°C. Spin briefly and place promptly on ice.
  1. Add:
  •    4 μl 5X RT Buffer
  •    1 μl 0.1 M DTT
  •    1 μl RNase Inhibitor (10 U/μl)
  •    1 μl GScript RTase (200 units/μl)
  •    final volume 20 μl

If generating cDNA longer than 5 kb at temperatures above 50°C using a gene-specific primer or oligo(dT)20, the amount of GScript RTase may be raised to 400 U (2 μl) to increase yield.
4. Incubate at 50°C for 30-60 minutes. Increase the reaction temperature to 55°C for gene-specific primer.
The reaction temperature may also be increased to 55°C for difficult templates or templates with high secondary structure.
5. Inactivate enzyme at 70°C for 15 minutes.
6. Store products at -20°C or proceed to PCR using 2 μl first-strand cDNA synthesis reaction mixture. Amplification of some PCR targets (> 1 kb) may require the removal of RNA complementary to the cDNA. To remove RNA complementary to the cDNA, add 1 μl (2 units) of E. coli RNase H and incubate at 37°C for 20 minutes.


Store all components at -20°C (non-frost-free). Thaw 5X RT Buffer, 0.1 M DTT at room temperature just prior to use and refreeze immediately.



MSDSGScript RTase0.1M DTT5X RT Buffer