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Updated: Aug 15, 2025
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High-throughput Gene Tagging in Trypanosoma brucei
Published on: August 12, 2016
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Dissecting Trypanosoma brucei RRP44 function in the maturation of segmented ribosomal RNA using a regulated genetic
Eloise Pavão Guerra-Slompo1, Giovanna Cesaro1,2, Beatriz Gomes Guimarães1,2
1Carlos Chagas Institute, Oswaldo Cruz Foundation, FIOCRUZ, R. Prof. Algacyr Munhoz Mader 3775, 81350-010, Curitiba-PR, Brazil.
Nucleic Acids Research
|January 7, 2023
Summary
The Trypanosoma brucei RRP44 nuclease is crucial for processing ribosomal RNA (rRNA) and U3 snoRNA. Its domains are essential for cell growth and proper RNA maturation, preventing precursor accumulation.
Area of Science:
- Molecular Biology
- Cell Biology
- Parasitology
Background:
- Trypanosoma brucei exhibits fragmented large subunit (LSU) rRNA, necessitating complex processing pathways.
- The RRP44 nuclease, containing PIN and RNB domains, is implicated in RNA processing and linked to the exosome complex.
Purpose of the Study:
- To investigate the role of the T. brucei RRP44 nuclease in pre-rRNA maturation using genetic complementation.
- To determine the functional importance of TbRRP44's PIN and RNB domains in T. brucei.
Main Methods:
- Genetic complementation strategy in T. brucei.
- Analysis of TbRRP44 domain function through mutation and deficiency studies.
- Identification of novel rRNA processing sites and intermediates.
Main Results:
- Both exonucleolytic RNB domain activity and the physical presence of the PIN domain are vital for TbRRP44 function.
- A catalytic site mutation in the PIN domain did not affect cell growth.
- TbRRP44 is essential for 5.8S rRNA 3'-end maturation, 5'-ETS degradation, and ITS1 removal during 18S rRNA processing.
- TbRRP44 deficiency causes accumulation of LSU rRNA precursors and affects U3 snoRNA and spliced leader processing.
Conclusions:
- TbRRP44 plays a critical role in multiple RNA processing events in T. brucei, including rRNA maturation and U3 snoRNA processing.
- The distinct domains of TbRRP44 contribute differentially to its essential functions in RNA processing and cell viability.
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