IUBMB Enzyme Nomenclature


Accepted name: ribonuclease IX

Reaction: Endonucleolytic cleavage of poly(U) or poly(C) to fragments terminated by 3'-hydroxy and 5'-phosphate groups

Other name(s): poly(U)- and poly(C)-specific endoribonuclease

Comments: Acts on poly(U) and poly(C), with a higher affinity for poly(C), but does not act on poly(A) or poly(G).

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 9001-99-4 (not distinguished from EC


1. Sideris, D.C. and Fragoulis, E.G. Purification and characterization of a ribonuclease specific for poly(U) and poly(C) from the larvae of Ceratitis capitata. Eur. J. Biochem. 164 (1987) 309-315. [PMID: 3569265]

[EC created 1992]

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