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Related Experiment Video

Updated: Oct 6, 2025

Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC

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Published on: May 9, 2020

Structural basis of Nrd1-Nab3 heterodimerization.

Belén Chaves-Arquero^1,2, Santiago Martínez-Lumbreras^1,3, Sergio Camero¹

¹Departamento de Química-Física Biológica, Instituto de Química-Física "Rocasolano" (IQFR), Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain.

Life Science Alliance

|January 13, 2022

Summary

This summary is machine-generated.

The heterodimerization of RNA binding proteins Nrd1 and Nab3 is crucial for nascent RNA recognition. Their structural complex reveals key interactions essential for yeast cell fitness and suggests conserved mechanisms in RNA processing.

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Area of Science:

Molecular Biology
Structural Biology
Yeast Genetics

Background:

The heterodimerization of RNA binding proteins Nrd1 and Nab3 is critical for communicating RNA recognition.
This interaction links nascent transcript processing with RNA polymerase II C-terminal domain recognition.

Purpose of the Study:

To elucidate the structural basis of Nrd1-Nab3 heterodimerization.
To understand the functional significance of this interaction in yeast.

Main Methods:

X-ray crystallography of a Nrd1-Nab3 chimera.
Mutagenesis studies.
Analysis of temperature-sensitive phenotypes.

Main Results:

The crystal structure reveals how the Nrd1 interaction domain of Nab3 (NRID) and Nab3 interaction domain of Nrd1 (NAID) form a stable heterodimer.
A conserved hydrophobic interface drives the favorable heterodimerization.
Mutations in this interface cause temperature-sensitive growth defects in yeast.

Conclusions:

The Nrd1-Nab3 structure explains their essential heterodimerization for RNA processing.
The findings highlight the importance of protein-protein interactions in gene expression regulation.
Structural similarities to the Rna14/Rna15 heterodimer suggest convergent evolution in RNA termination pathways.