what is rnase
1 EC 3.1.26.5: RNase P is a type of ribonuclease that is unique in that it is a ribozyme â a ribonucleic acid that acts as a catalyst in the same way as an enzyme. 2  Its function is to cleave off an extra, or precursor, sequence on tRNA molecules. RNase A (e.g. , bovine pancreatic ribonuclease A: PDB: 2AAS â) is one of the hardiest enzymes in common laboratory usage; one method of isolating it is to boil a crude cellular extract until all enzymes other than RNase A are denatured.