RNasin Plus RNase Inhibitor, 10,000u

RNases are ubiquitous and can cause RNA degradation and compromise RNA integrity. Native and Recombinant RNasin Inhibitors are 50kDa proteins that inhibit RNase A family and human placental RNases by noncovalently binding to RNases in a 1:1 ratio. For downstream applications such as GoScript Reverse Transcriptase, AMV/M-MLV reverse transcriptases, SP6, T7/T3 RNA polymerase, and Taq DNA polymerases, Recombinant RNasin Inhibitor does not inhibit RNase T1, S1 nuclease, RNase from Aspergillus, RNase H, RNase ONE Ribonuclease and enzymes. RNasin Plus RNase Inhibitor is a recombinant mammalian RNase inhibitor that is expressed as a soluble protein in E. coli, allowing easy purification through a combination of ion exchange and hydrophobic interaction chromatography. The protein is capable of inhibiting eukaryotic RNases (e.g., RNase A and RNase B) similarly to human placental RNase inhibitor. RNasin Plus RNase Inhibitor is tested in RT-PCR and compatible with enzymes such as AMV, M-MLV and ImProm-II Reverse Transcriptases or Taq and Tfl DNA Polymerases. RNasin Plus RNase Inhibitor also is tested and compatible with quantitative, real-time RT-PCR in a TaqMan assay. RNasin Plus RNase Inhibitor offers increased resistance to oxidation over the human version of the protein. Two cysteines in the human protein have been identified as especially sensitive to oxidation and react by forming a disulfide bond that can block the active site of the inhibitor. RNasin Plus, through natural amino acid diversity, lacks the ability to form this site-blocking disulfide. In addition, the new protein has characteristics never before realized, including continued inhibition of RNases above 50°C. Heating solutions of RNasin Plus and RNase followed by cooling does not result in the reappearance of RNase activity—even when the solution is heated above the denaturation temperature of the RNasin Plus protein alone. This allows RNasin Plus to protect RNA species prior to, during and after heating, even at temperatures normally used during first-strand DNA synthesis in RT-PCR. Solutions heated up to 70°C for 15 minutes did not result in RNase reactivation.