Moloney Murine Leukemia Virus Reverse Transcriptase (MMLV RT) is an RNA-dependent DNA polymerase that can be used for cDNA synthesis and subsequent PCR or qPCR in one-step or two-step RT-PCR or RT-qPCR assays.

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Meridian's MMLV-RT

  • Highly sensitive, even with low concentrations of template RNA

  • Thermostability up to 45°C, for more challenging transcripts

  • High-quality, first-strand cDNA ideal for most RT-PCR and RT-qPCR applications

  • Lower RNase H activity for high yield



Application: RT-qPCR Specimen Type: Reverse Transcriptase Concentration: 100x High Concentration: No Wet: Yes
Glycerol-Free: NoNo Lyo-Ready: No Air-Dryable: No Dryable: No Sustainability:

For cDNA synthesis and subsequent PCR or qPCR in a one-step or two-step assay.

Available in 200 µL (1,000 Rxns) or 2 mL (10,000 Rxns) aliquots


MMLV-RT is a high-quality reverse transcriptase that synthesizes a complementary DNA (cDNA) strand from mRNA or total RNA. With higher thermostability and reduced RNase H activity, it can be used for synthesis with long messenger RNA templates with high sensitivity and efficiency and is ideal for detecting low-level target genes.


Description MMLV-RT (Moloney Murine Leukemia Virus Reverse Transcriptase) is used for cDNA synthesis and subsequent PCR or qPCR in a one-step or two-step assay.
Concentration 100x
Appearance Clear, colorless solution
Application cDNA synthesis, RT-PCR, PCR, two-step RT-qPCR, one-step RT-qPCR
Sample type RNA
Presentation 1 vial
Storage -20 °C
Mix stability See outer label
Consistency ± 0.5 Ct variance between test and reference sample
DNA contamination None detected in PCR amplification with traces overlay with the negative control on E. coli and mouse genomic DNA specific targets.
DNase/RNase Contamination No detectable degradation


For RNA with very high secondary structure we recommend using 55C MMLV-RT (MDX117), this reverse transcriptase can be used at temperatures up to 60°C which improves the cDNA yield from difficult RNA targets that require higher temperature to denature strong secondary structures.

Avoiding ribonuclease contamination is of primary concern since high quality template RNA is required. You can add RNase Inhibitor (MDX056), alternatively we also have RNase-Tolerant MMLV-RT (MDX043) which includes an RNase inhibitor.

If you are going to make cDNA, you will require a buffer that contains 0.2 mM each dATP, dCTP, dGTP & dTTP, 10 mM DTT (dithiothreitol), 25 mM KCl, 3.5 mM MgCl2 and 50 mM Tris–HCl (7.5). However if you want to do RT-qPCR, we recommend 1-Step qPCR Buffer, 4x (MDX034) or Lyo-Ready 1-Step RT-qPCR Buffer (MDX052).

The reverse transcriptase can be inactivated by adding a chelating agent such as EDTA or heating to 70°C or higher for 10 min.

Yes, to initiate reverse transcription, the MMVL-RT reverse transcriptase require a primer to bind to its complementary sequences on the RNA template and serve as a starting point for synthesis of a new strand. For general cDNA synthesis, random hexamer primers and oligo(dT) primers can be used either separately or mixed. For RT-PCR and RT-qPCR gene-specific primers should be used.

Unlike eukaryotic replicative polymerases, reverse transcriptase lack exonuclease activity and so is error prone. MMLV-based reverse transcriptase has been reported to have an error rate in the range of 1.1 × 10−4 to 4.8 × 10−4.

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