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Case-controlled structure validation.

Randy J Read1, Gerard J Kleywegt

  • 1Department of Haematology, University of Cambridge, Cambridge Institute for Medical Research, Wellcome Trust/MRC Building, Cambridge, England. rjr27@cam.ac.uk

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Summary
This summary is machine-generated.

This study introduces case-matched controls to compare macromolecular crystal structure quality. Controlling for factors like resolution and size reveals no significant quality difference between structural genomics and traditional sources or journal impact factors.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Crystallography

Background:

  • Macromolecular crystal structure quality is influenced by multiple factors beyond resolution.
  • Current validation criteria often rely solely on resolution, potentially invalidating comparisons between different structure sets.
  • Systematic differences in factors like structure size and deposition year can affect quality assessments.

Purpose of the Study:

  • To introduce and apply a case-matched control methodology for comparing macromolecular crystal structure quality.
  • To investigate if structures from structural genomics efforts match the quality of those from traditional sources.
  • To determine if journal impact factor correlates with the quality of published macromolecular structures.

Main Methods:

  • Utilized a case-matched control approach, matching structures based on resolution, asymmetric unit volume, and year of deposition.
  • Applied this method to compare structures from structural genomics initiatives versus traditional sources.
  • Analyzed the relationship between journal impact factor and structure quality, controlling for other relevant factors.

Main Results:

  • After controlling for factors like resolution, structure size, and deposition year, no significant quality difference was found between structural genomics and traditional sources.
  • Controlling for these factors also revealed little evidence of a systematic correlation between journal impact factor and structure quality.

Conclusions:

  • The case-matched control method provides a robust framework for comparing macromolecular structure quality across different datasets.
  • Structural genomics efforts produce crystal structures of comparable quality to traditional methods.
  • Journal impact factor does not appear to be a reliable indicator of macromolecular structure quality when other factors are controlled.