CATH Classification

Domain Context

CATH Clusters

Superfamily Ribonuclease A-like domain
Functional Family Ribonuclease pancreatic

Enzyme Information

4.6.1.18
Pancreatic ribonuclease.
based on mapping to UniProt P00669
(1) An (RNA) containing cytidine + H(2)O = an (RNA)-3'-cytidine- 3'-phosphate + a 5'-hydroxy-ribonucleotide-3'-(RNA). (2) An (RNA) containing uridine + H(2)O = an (RNA)-3'-uridine- 3'-phosphate + a 5'-hydroxy-ribonucleotide-3'-(RNA).
-!- Specifically cleaves at the 3'-side of pyrimidine (uracil or cytosine) phosphate bonds in RNA. -!- The reaction takes place in two steps, with the 2',3'-cyclic phosphodiester intermediates released from the enzyme at the completion of the first step. -!- Hydrolysis of these cyclic compounds occurs at a much slower rate through a reversal of the first step, in which the -OH group of water substitutes for the 2'-OH group of the ribose used in the first step, and does not take place until essentially all the susceptible 3',5'-phosphodiester bonds have been cyclised. -!- The enzyme can act as an endo- or exo ribonuclease. -!- Formerly EC 2.7.7.16, EC 3.1.4.22 and EC 3.1.27.5.

UniProtKB Entries (1)

P00669
RNS_BOVIN
Bos taurus
Seminal ribonuclease

PDB Structure

PDB 11BA
External Links
Method X-RAY DIFFRACTION
Organism
Primary Citation
Binding of a substrate analog to a domain swapping protein: X-ray structure of the complex of bovine seminal ribonuclease with uridylyl(2',5')adenosine.
Vitagliano, L., Adinolfi, S., Riccio, A., Sica, F., Zagari, A., Mazzarella, L.
Protein Sci.
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