title: Lin28 recruits the TUTase Zcchc11 to inhibit let-7 maturation in mouse embryonic stem cells.
abstract: Lin28 and Lin28B, two developmentally regulated RNA-binding proteins and likely proto-oncogenes, selectively inhibit the maturation of let-7 family microRNAs (miRNAs) in embryonic stem cells and certain cancer cell lines. Moreover, let-7 precursors (pre-let-7) were previously found to be terminally uridylated in a Lin28-dependent fashion. Here we identify Zcchc11 (zinc finger, CCHC domain containing 11) as the 3' terminal uridylyl transferase (TUTase) responsible for Lin28-mediated pre-let-7 uridylation and subsequent blockade of let-7 processing in mouse embryonic stem cells. We demonstrate that Zcchc11 activity is UTP-dependent, selective for let-7 and recruited by Lin28. Furthermore, knockdown of either Zcchc11 or Lin28, or overexpression of a catalytically inactive TUTase, relieves the selective inhibition of let-7 processing and leads to the accumulation of mature let-7 miRNAs and repression of let-7 target reporter genes. Our results establish a role for Zcchc11-catalyzed pre-let-7 uridylation in the control of miRNA biogenesis.
authors.affiliation: Stem Cell Program, Children's Hospital Boston, Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Harvard Stem Cell Institute, Boston, Massachusetts, USA.
authors.forename: John P
authors.initials: JP
authors.lastname: Hagan
authors.forename: Elena
authors.initials: E
authors.lastname: Piskounova
authors.forename: Richard I
authors.initials: RI
authors.lastname: Gregory
mesh_terms: D000818:Animals; D002384:Catalysis; D045744:Cell Line, Tumor; D004268:DNA-Binding Proteins / Q000378:metabolism*; D053595:Embryonic Stem Cells / Q000378:metabolism; D017930:Genes, Reporter; D051379:Mice; D035683:MicroRNAs / Q000378:metabolism*; D008957:Models, Genetic; D009865:Oocytes / Q000378:metabolism; D017434:Protein Structure, Tertiary; D012333:RNA, Messenger / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000378:metabolism / Q000502:physiology*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016335:Zinc Fingers
chemical_list: D004268:DNA-Binding Proteins; C488352:Lin-28 protein, mouse; D035683:MicroRNAs; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; C542687:mirnlet7 microRNA, mouse; C511129:ZCCHC11 protein, mouse