Download MendeleyDicer-TRBP Complex Formation Ensures Accurate Mammalian MicroRNA Biogenesis.
Wilson, R.C., Tambe, A., Kidwell, M.A., Noland, C.L., Schneider, C.P., Doudna, J.A.(2015) Mol Cell 57: 397-407
- PubMed: 25557550
- DOI: https://doi.org/10.1016/j.molcel.2014.11.030
- Primary Citation of Related Structures:
4WYQ - PubMed Abstract:
RNA-mediated gene silencing in human cells requires the accurate generation of ∼22 nt microRNAs (miRNAs) from double-stranded RNA substrates by the endonuclease Dicer. Although the phylogenetically conserved RNA-binding proteins TRBP and PACT are known to contribute to this process, their mode of Dicer binding and their genome-wide effects on miRNA processing have not been determined. We solved the crystal structure of the human Dicer-TRBP interface, revealing the structural basis of the interaction. Interface residues conserved between TRBP and PACT show that the proteins bind to Dicer in a similar manner and by mutual exclusion. Based on the structure, a catalytically active Dicer that cannot bind TRBP or PACT was designed and introduced into Dicer-deficient mammalian cells, revealing selective defects in guide strand selection. These results demonstrate the role of Dicer-associated RNA binding proteins in maintenance of gene silencing fidelity.
Organizational Affiliation:
Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA.
