Journal: EMBO J / Year: 2009 Title: Snapshots of the RNA editing machine in trypanosomes captured at different assembly stages in vivo. Authors: Monika M Golas / Cordula Böhm / Bjoern Sander / Kerstin Effenberger / Michael Brecht / Holger Stark / H Ulrich Göringer / Abstract: Mitochondrial pre-messenger RNAs in kinetoplastid protozoa are substrates of uridylate-specific RNA editing. RNA editing converts non-functional pre-mRNAs into translatable molecules and can generate ...Mitochondrial pre-messenger RNAs in kinetoplastid protozoa are substrates of uridylate-specific RNA editing. RNA editing converts non-functional pre-mRNAs into translatable molecules and can generate protein diversity by alternative editing. Although several editing complexes have been described, their structure and relationship is unknown. Here, we report the isolation of functionally active RNA editing complexes by a multistep purification procedure. We show that the endogenous isolates contain two subpopulations of approximately 20S and approximately 35-40S and present the three-dimensional structures of both complexes by electron microscopy. The approximately 35-40S complexes consist of a platform density packed against a semispherical element. The approximately 20S complexes are composed of two subdomains connected by an interface. The two particles are structurally related, and we show that RNA binding is a main determinant for the interconversion of the two complexes. The approximately 20S editosomes contain an RNA-binding site, which binds gRNA, pre-mRNA and gRNA/pre-mRNA hybrid molecules with nanomolar affinity. Variability analysis indicates that subsets of complexes lack or possess additional domains, suggesting binding sites for components. Together, a picture of the RNA editing machinery is provided.
History
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Jan 26, 2009
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Header (metadata) release
Feb 25, 2009
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Map release
Jan 27, 2011
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Update
Dec 11, 2013
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Current status
Dec 11, 2013
Processing site: PDBe / Status: Released
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