In Trypanosoma brucei RNA editing, TbMP18 (band VII) is critical for editosome integrity and for both insertional and deletional cleavages

Julie A. Law, Sean O'Hearn, Barbara Sollner-Webb

Research output: Contribution to journalArticle

Abstract

In trypanosome RNA editing, uridylate (U) residues are inserted and deleted at numerous sites within mitochondrial pre-mRNAs by an ∼20S protein complex that catalyzes cycles of cleavage, U addition/U removal, and ligation. We used RNA interference to deplete TbMP18 (band VII), the last unexamined major protein of our purified editing complex, showing it is essential. TbMP18 is critical for the U-deletional and U-insertional cleavages and for integrity of the ∼20S editing complex, whose other major components, TbMP99, TbMP81, TbMP63, TbMP52, TbMP48, TbMP42 (bands I through VI), and TbMP57, instead sediment as ∼10S associations. Additionally, TbMP18 augments editing substrate recognition by the TbMP57 terminal U transferase, possibly aiding the recognition component, TbMP81. The other editing activities and their coordination in precleaved editing remain active in the absence of TbMP18. These data are reminiscent of the data on editing subcomplexes reported by A. Schnaufer et al. (Mol. Cell 12:307-319, 2003) and suggest that these subcomplexes are held together in the ∼20S complex by TbMP18, as was proposed previously. Our data additionally imply that the proteins are less long-lived in these subcomplexes than they are when held in the complete editing complex. The editing endonucleolytic cleavages being lost when the editing complex becomes fragmented, as upon TbMP18 depletion, should be advantageous to the trypanosome, minimizing broken mRNAs.

Original languageEnglish (US)
Pages (from-to)777-787
Number of pages11
JournalMolecular and Cellular Biology
Volume27
Issue number2
DOIs
StatePublished - Jan 2007

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RNA Editing
Trypanosoma brucei brucei
Trypanosomiasis
Proteins
RNA Precursors
Transferases
RNA Interference
Ligation
Messenger RNA

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cell Biology

Cite this

In Trypanosoma brucei RNA editing, TbMP18 (band VII) is critical for editosome integrity and for both insertional and deletional cleavages. / Law, Julie A.; O'Hearn, Sean; Sollner-Webb, Barbara.

In: Molecular and Cellular Biology, Vol. 27, No. 2, 01.2007, p. 777-787.

Research output: Contribution to journalArticle

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