title: Partial purification of a double-stranded RNA specific ribonuclease (RNAse D) from Krebs II ascites cells.
abstract: In a search for eucaryotic enzymes which might process the heterogenous nuclear RNA (HnRNA) from animal cells into messenger RNA, a ribonuclease called RNAse D analogous to E. coli RNAse III in its ability to cleave specifically synthetic or viral double-stranded polyribonucleotides has been detected and extensively purified from the cytosol of Krebs II mouse ascites cells. The purification procedure involved cellular fractionation followed by DEAE-and CM-cellulose chromatography and resulted in an RNAas D preparation contaminated with trace amounts of single-strand specific RNAse (equivalent to less than 0.3 ng per ml) as assayed against poly (rC). Significant levels of RNAse H activity against poly (rA)-poly (dT) were still present in these preparations.
mesh_terms: D000818:Animals; D002287:Carcinoma, Krebs 2 / Q000201:enzymology*; D002467:Cell Nucleus; D007700:Kinetics; D051379:Mice; D012260:Ribonucleases / Q000302:isolation & purification* / Q000378:metabolism; D013347:Subcellular Fractions / Q000201:enzymology
chemical_list: D012260:Ribonucleases