title: Base-specific ribonucleases potentially involved in heterogeneous nuclear RNA processing and poly(A) metabolism.
abstract: Polyadenylation and splicing of heterogeneous nuclear RNA, two crucial steps in mRNA processing, are apparently enzymatically mediated processes. This contribution summarizes the properties and the presumed functions of the known poly(A) catabolic enzymes (endoribonuclease IV and V, 2',3'- exoribonuclease ) as well as those of the pyrimidine-specific endoribonucleases associated with snRNP -hnRNP complexes (endoribonuclease VII, acidic pI 4.1 endoribonuclease and poly(U)-specific U1 snRNP -nuclease).
mesh_terms: D000818:Animals; D001483:Base Sequence; D009690:Nucleic Acid Conformation; D011061:Poly A / Q000096:biosynthesis* / Q000378:metabolism; D011072:Poly U; D012326:RNA Splicing; D012332:RNA, Heterogeneous Nuclear / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D012260:Ribonucleases / Q000378:metabolism*; D012261:Ribonucleoproteins / Q000378:metabolism; D017411:Ribonucleoproteins, Small Nuclear
chemical_list: D012332:RNA, Heterogeneous Nuclear; D012333:RNA, Messenger; D012261:Ribonucleoproteins; D017411:Ribonucleoproteins, Small Nuclear; D011061:Poly A; D011072:Poly U; D012260:Ribonucleases