RNase A (RP145)

The Ribonuclease A (RNase A) is a 13.7 kDa (monomer) endoribonuclease isolated from bovine pancreas, which selectively cleaves single-stranded RNA 3’ next to pyrimidine residues (cytosine, uracil). It degrades RNA to cyclic nucleotide monophosphates to 5’- OH and 2’-, 3’-cyclic monophosphate. The enzyme exhibits no endonuclease or exonuclease activity towards DNA substrates. The RNase A is used to remove RNA during the isolation procedures of plasmid and genomic DNA.
RP147, RP145

SKU: RP145 Categories: ,
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RNase A RP145. 50 mg Ask for an offer

The enzyme is very active under a wide range of reaction conditions and difficult to inactivate. At low salt concentrations (up to 100 mM NaCl), the RNase A cleaves single- and double-stranded RNA as well as an RNA strand in RNA-DNA hybrids. However, under high salt concentrations (>300 mM NaCl), the RNase A specifically cleaves single-stranded RNA.


  • Enzyme activity: > 80 units/mg protein
  • Supplied in a salt-free, freeze dried form
  • DNase-free
  • Protease-free


  • Purification of RNA-free DNA
  • Plasmid and genomic DNA isolation
  • Removal of RNA during recombinant proteins preparations
  • RNA protection assays
  • Mapping of single-base mutations in DNA or RNA

Unit definition

One unit (U) of activity is defined as that amount of enzyme which causes the hydrolys is of RNA to yield a velocity constant, k=1, at 25°C and pH 5.0

RNase A (RP145) - Manual


Stock solutions should be prepared to a final concentration 1 – 10 mg/ml by resuspending in 10 mM Tris-HCl (pH 7.5), 15 mM NaCl, 50% (v/v) glycerol or in TE buffer.

The recommended working solution concentration depends on application.

  1. For removal of RNA from plasmid preparations use 10 μg/ml working solution and incubate sample for 1 hour at room temperature.
  2. For preparation of „blunt ends” of double-stranded cDNA use 100 ng/ml working solution.

Storage conditions

Keep at -20°C (lyophilized or in a 50% glycerol solution) for long-term storage or at +4°C for up to several weeks. When stored at -20°C (lyophilized or in a glycerol solution), the enzyme remains stable for several years.

Shipping conditions

Shipping at ambient temperature.

Additional information

  • The RNase A has a high affinity to glass surfaces.
  • At neutral pH & high concentrations (>10 mg/ml) the enzyme will precipitate.
  • The enzyme is inhibited by diethyl pyrocarbonate (DEPC), guanidinium salts (4 M GuSCN), β-mercaptoethanol, heavy metals and RNase-inhibitors like RIBOPROTECT Hu (RT35).
  • In order to remove the enzyme from a sample, perform a separation with spin columns or several phenol/chloroform extractions.

Quality control

The activity of the enzyme, absence of deoxyribonucleases and proteases has been confirmed in appropriate quality tests.

RNase A (RP145) – MSDS

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