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R6513 Sigma

Ribonuclease A from bovine pancreas

for molecular biology, ≥70 Kunitz units/mg protein, lyophilized

Synonym: Pancreatic Ribonuclease, RNase A, Ribonuclease I, Ribonucleate 3′-pyrimidinooligonucleotidohydrolase



Analysis Note

Protein determined by E1%/280.

Features and Benefits

• RNase protection assays
• Remove unspecifically bound RNA
• Analysis of RNA sequences
• Hydrolyze RNA contained in protein samples
• Purification of DNA

General description

RNase A is an endoribonuclease that attacks at the 3’OHphosphate of a pyrimidine nucleotide. The sequence of pG-pG-pC-pA-pG will be cleaved to give pG-pG-pCp and A-pG. The highest activity is exhibited with single stranded RNA.

Other Notes

A major application for RNase A is the removal of RNA from preparations of plasmid DNA. For this application, DNase free RNase A is used at a final concentration of 10 μg/mL.

Boiling stock solutions of this RNase A product to inactivate residual DNase is not necessary and may cause precipitation of RNase and possible loss of enzymatic activity. If an RNase A solution is heated at a neutral pH, precipitation will occur. When heated at a lower pH, some precipitation may occur because of protein impurities that are present.

Activators of RNase A include potassium and sodium salts. RNase A can be inhibited by alkylation of His12 or His119.


Ribonuclease A is used to remove RNA from DNA plasmid preparations and protein samples. It is also used in RNA sequence analysis and protection assays.

Price and Availability

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Protocols & Articles


Enzymatic Assay of Ribonuclease A (EC

This procedure may be used for determination of Ribonuclease A (RNase A) activity. The Spectrophotometric Stop Rate Determination [Absorbance at 300 nm (A300), Light path = 1 cm] is based on the foll...

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