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RNA Catalyst as a Reporter for Screening Drugs against RNA Editing in Trypanosomes

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Structural basis of Spliced Leader RNA recognition by the Trypanosoma brucei cap-binding complex.

Harald Bernhard^1,2, Hana Petržílková¹, Barbora Popelářová^1,3

¹EMBL Grenoble, 71 Avenue des Martyrs, Grenoble, France.

Nature Communications

|January 15, 2025

Summary

Researchers uncovered the structure of the Trypanosoma brucei cap-binding complex (TbCBC), revealing how it binds to spliced leader RNA during mRNA processing in kinetoplastids.

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Area of Science:

Molecular biology
Structural biology
Parasitology

Background:

Kinetoplastids transcribe genes into polycistronic pre-mRNAs requiring trans-splicing for mature mRNAs.
A trypanosomatid-specific cap-binding complex (CBC) binds the spliced leader RNA (SL RNA) during this process.
The function of some CBC subunits in kinetoplastids remains unclear.

Purpose of the Study:

To determine the molecular architecture of the Trypanosoma brucei cap-binding complex (TbCBC).
To elucidate the interaction between TbCBC and the SL RNA.
To provide insights into mRNA maturation in kinetoplastids and potential drug targets.

Main Methods:

Cryo-electron microscopy (cryo-EM) to determine the structure of the TbCBC complex.
Structural analysis to identify subunit interactions with SL RNA features.

Main Results:

The cryo-EM structures reveal the molecular architecture of the TbCBC.
TbCBC interacts with two distinct SL RNA features: TbCBP20 binds the m7G cap, and TbCBP66 recognizes double-stranded regions.
This detailed structural understanding clarifies the mechanism of SL RNA binding.

Conclusions:

The study elucidates the structural basis of SL RNA recognition by TbCBC.
Findings advance understanding of mRNA processing in kinetoplastids.
Structural insights may guide the development of anti-trypanosomatid drugs targeting TbCBC.