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Phasing the 30S ribosomal subunit structure.

D E Brodersen¹, W M Clemons, A P Carter

¹MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, England.

Acta Crystallographica. Section D, Biological Crystallography

|October 24, 2003

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Determining the large 850 kDa structure of the 30S ribosomal subunit from Thermus thermophilus used standard crystallography methods. Anomalous signals from heavy atoms on RNA were essential for high-resolution ab initio structure determination.

Area of Science:

Structural Biology
Biochemistry
Crystallography

Background:

The 30S ribosomal subunit is crucial for protein synthesis.
Determining the structure of large macromolecular complexes presents significant challenges.

Purpose of the Study:

To review and analyze methods for phasing large structures.
To demonstrate the necessity and sufficiency of anomalous signals for ab initio structure determination of the 850 kDa 30S ribosomal subunit.

Main Methods:

Standard protein crystallography techniques were employed.
Anomalous scattering data were collected from heavy-atom compounds bound to RNA.
Strategies to address non-isomorphism and radiation decay were implemented.

Main Results:

Related Experiment Videos

The anomalous signal from heavy atoms was sufficient for high-resolution ab initio structure determination.
The methods are applicable to other large macromolecular structures.
Effective measures against experimental challenges like non-isomorphism and radiation decay were identified.

Conclusions:

High-resolution structure determination of large complexes like the 850 kDa 30S ribosomal subunit is feasible using anomalous scattering.
Anomalous signal phasing is a robust method for ab initio structure determination of RNA-containing macromolecular assemblies.
The study provides insights into overcoming common hurdles in crystallographic structure determination.