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Iterative Optimization of DNA Duplexes for Crystallization of SeqA-DNA Complexes

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Published on: November 1, 2012

Functional implications from the Cid1 poly(U) polymerase crystal structure.

Paola Munoz-Tello¹, Caroline Gabus, Stéphane Thore

¹Department of Molecular Biology, University of Geneva, 30 Quai Ernest Ansermet, Geneva 1211, Switzerland.

Structure (London, England : 1993)

|May 22, 2012

Summary

This summary is machine-generated.

Researchers elucidated the atomic structure of the poly(U) polymerase Cid1, revealing its UTP binding and catalytic cycle. This provides insights into cellular RNA degradation and its role in gene regulation.

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Identification of Functional Protein Regions Through Chimeric Protein Construction

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Published on: January 8, 2019

Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

mRNA degradation is a crucial cellular process in eukaryotes, initiated by poly(A) tail removal, decapping, and subsequent exonuclease activity.
3'-end uridylation has emerged as a key regulatory step in RNA degradation pathways, highlighting the importance of poly(U) polymerases (PUPs).

Purpose of the Study:

To determine the atomic structure of the Cid1 protein, a founding member of the PUP family, in its UTP-bound state.
To elucidate the mechanism of RNA substrate accommodation and product translocation by Cid1.
To propose a catalytic cycle for Cid1 based on structural and mutagenesis data.

Main Methods:

X-ray crystallography was employed to determine the atomic structure of the Cid1 protein bound to UTP.
Site-directed mutagenesis was performed to investigate the role of specific amino acid residues in Cid1 function.
Biochemical assays were used to study the catalytic activity and RNA binding properties of Cid1.

Main Results:

The atomic structure of Cid1 in complex with UTP was resolved, showing unambiguous positioning of the UTP molecule.
Structural data suggest that Cid1 utilizes local and global movements for RNA substrate binding and product release.
Mutagenesis studies supported the proposed catalytic cycle and highlighted Cid1's RNA binding capabilities.

Conclusions:

The atomic model of Cid1 provides a structural basis for understanding its enzymatic mechanism and role in RNA processing.
Cid1's RNA binding properties have significant implications for microRNA (miRNA) regulation, histone mRNA decay, and general cellular RNA degradation.
This study offers a foundation for further research into the broader biological roles of poly(U) polymerases.