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Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae

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A dimeric structure for archaeal box C/D small ribonucleoproteins.

Franziska Bleichert¹, Keith T Gagnon, Bernard A Brown

¹Department of Genetics, Yale University School of Medicine, New Haven, CT 06520, USA.

Science (New York, N.Y.)

|September 12, 2009

Summary

Methylation of ribosomal RNA (rRNA) is essential for protein synthesis. Archaeal box C/D small ribonucleoproteins (sRNPs) form an unexpected dimeric structure crucial for their function.

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Area of Science:

Molecular Biology
Structural Biology
Biochemistry

Background:

Ribosomal RNA (rRNA) methylation is vital for efficient protein synthesis.
Box C/D guide ribonucleoproteins (sRNPs/snoRNPs) perform these methylations, conserved across life.
Methylation specificity relies on RNA-protein base pairing with target rRNA.

Purpose of the Study:

To determine the structure of an archaeal box C/D sRNP.
To investigate the architectural organization of archaeal box C/D sRNPs.
To assess the functional relevance of the observed sRNP structure.

Main Methods:

Single-particle electron microscopy (cryo-EM) of reconstituted sRNPs.
Structural determination of archaeal box C/D sRNPs.
Mutational analysis to probe enzymatic function.

Main Results:

The structure of a reconstituted, active box C/D sRNP from Methanocaldococcus jannaschii was determined.
Archaeal box C/D sRNPs were found to form an unexpected dimeric structure.
This dimeric organization features an alternative arrangement of RNA and protein components.

Conclusions:

The dimeric structure of archaeal box C/D sRNPs challenges conventional models.
The di-sRNP architecture is functionally relevant for archaeal box C/D sRNP enzymatic activity.
This finding provides new insights into the evolution and mechanism of rRNA methylation machinery.