A three-dimensional working model for a guide RNA from Trypanosoma brucei.

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 Res

journal_title

Nucleic acids research

authors

Hermann T,Schmid B,Heumann H,Göringer HU

doi

10.1093/nar/25.12.2311

subject

Has Abstract

pub_date

1997-06-15 00:00:00

pages

2311-8

issue

12

eissn

0305-1048

issn

1362-4962

pii

gka384

journal_volume

25

pub_type

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