Medical Term:

ribonuclease (pancreatic)

Pronunciation: rī′bō-nū′klē-ās pan′krē-at′ik

Definition: An enzyme isolated from the pancreas of ruminants that transfers the 3′-phosphate of a pyrimidine ribonucleotide residue in a polynucleotide from the 5′-position of the adjoining nucleotide to the 2′-position of the pyrimidine nucleotide itself (a transferase, endonuclease action), thus breaking the chain and forming a pyrimidine 2′,3′-cyclic phosphate, then (or independently) hydrolyzing this phosphodiester to leave a pyrimidine nucleoside 3′-phosphate residue (phosphodiesterase action); used in cytochemistry to selectively degrade and remove RNA as a control for staining of RNA. End products are nucleoside 3′-phosphates and 3′-phosphooligonucleotides ending Cp or Up.

Synonym(s): RNase A, RNase I

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