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NCS-constrained exhaustive search using oligomeric models.

Michail N Isupov1, Andrey A Lebedev

  • 1Henry Wellcome Building for Biocatalysis, School of Biosciences, University of Exeter, Stocker Road, Exeter EX4 4QD, England. m.isupov@exeter.ac.uk

Acta Crystallographica. Section D, Biological Crystallography
|December 21, 2007
PubMed
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This study presents a novel approach to molecular replacement (MR) by omitting the cross-rotation function step. This method optimizes oligomer orientation and internal organization, simplifying difficult MR cases.

Area of Science:

  • Structural biology
  • Biophysics
  • Crystallography

Background:

  • The cross-rotation function in molecular replacement (MR) is limited by its use of only a fraction of Patterson vectors.
  • Existing methods often require general techniques or specific structural features for improved efficiency.

Purpose of the Study:

  • To develop and validate an alternative MR strategy that bypasses the cross-rotation function step.
  • To optimize oligomer orientation and internal organization parameters through exhaustive search in specific cases.

Main Methods:

  • Utilizing unambiguous noncrystallographic symmetry (NCS) axes derived from self-rotation functions.
  • Employing homologous protein structures in related oligomeric states.
  • Performing exhaustive searches to optimize unknown parameters defining oligomer orientation and internal organization.

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Main Results:

  • Successfully omitted the cross-rotation function step in three challenging MR cases.
  • Determined key parameters for oligomer orientation and internal organization.
  • Positioned oligomers by maximizing the correlation coefficient during translation searches.

Conclusions:

  • The proposed method offers an efficient alternative to the traditional cross-rotation function in MR.
  • This approach is particularly effective in special cases with well-defined NCS axes and available homologous structures.
  • The strategy simplifies complex molecular replacement problems, enabling successful structure determination.