Abstract:
:RNA editing in protozoan parasites is a mitochondrial RNA processing reaction in which exclusively uridylate residues are inserted into, and less frequently deleted from, pre-mRNAs. Molecules central to the process are so-called guide RNAs (gRNAs) which function as templates in the reaction. For a detailed molecular understanding of the mechanism of the editing process knowledge of structural features of gRNAs will be essential. Here we report on a computer-assisted molecular modelling approach to construct the first three-dimensional gRNA model for gND7-506, a ND7-specific gRNA from Trypanosoma brucei. The modelling process relied on chemical modification and enzymatic probing data and was validated by in vitro mutagenesis experiments. The model predicts a reasonably compact structure, where two stem/loop secondary structure elements are brought into close proximity by a triple A tertiary interaction, forming a core element within the centre of the molecule. The model further suggests that the surface of the gRNA is primarily made up of the sugar-phoshate backbone. On the basis of the model, footprinting experiments of gND7-506 in a complex with the gRNA binding protein gBP21 could successfully be interpreted and provide a first picture for the assembly of gRNAs within a ribonucleoprotein complex.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Hermann T,Schmid B,Heumann H,Göringer HUdoi
10.1093/nar/25.12.2311subject
Has Abstractpub_date
1997-06-15 00:00:00pages
2311-8issue
12eissn
0305-1048issn
1362-4962pii
gka384journal_volume
25pub_type
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