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Thermo Scientific RevertAid Premium Reverse Transcriptase was developed through in vitro evolution of M-MuLV RT. The enzyme possesses an RNA-dependent and DNA-dependent polymerase activity, but lacks RNase H activity. The engineered enzyme features dramatically improved thermostability, robustness, and an increased synthesis rate compared to wild type M-MuLV RT.
The eliminated RNase H activity enables the enzyme to produce very long RNA transcripts up to 20 kb. Due to its high thermostability, the enzyme maintains full activity during the entire reverse transcription reaction and generates high yields of cDNA. The reaction temperature can be increased up to 60°C for efficient transcription of RNA regions with a high secondary structure, or to improve specificity using gene-specific primers.
Figure 1 | RevertAid Premium Reverse Transcriptase retains more activity over time. Reverse transcriptases were incubated in 1X reaction buffer. At the indicated time points (5 to 240 minutes), enzyme activity was determined in a standard activity assay.
Figure 2 | RevertAid Premium Reverse Transcriptase synthesizes transcripts up to 20 kb long. 1 µg of total mouse tongue RNA and oligo(dT)18 primer were used in a 60 minute reverse transcription reaction at 50°C with RevertAid Premium Reverse Transcriptase. Synthesized cDNA was used as a template in subsequent PCR with the Long PCR Enzyme Mix and primers specific to different regions of the nebulin gene.
Figure 3 | RevertAid Premium Reverse Transcriptase enables accurate quantification of transcripts over 8 orders of magnitude. RevertAid Premium Reverse Transcriptase was used in parallel first strand synthesis reactions with serial dilutions of in vitro transcribed GAPDH RNA (10-108 copies) for 15 minutes at 50°C. The synthesized cDNA was used in qPCR with Maxima SYBR Green/ROX qPCR Master Mix and primers specific to the GAPDH gene. Reaction efficiency was 96%, slope -3.43, R2 = 0.999.
F. L. Pinto, P. Lindblad, A guide for in-house design of template-switch-based 5’rapid amplification of cDNA ends systems. Analytical Biochemistry. 397(2), 227-232 (15 February 2010).