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Ab initio molecular-replacement phasing for symmetric helical membrane proteins.

Pavel Strop1, Michael R Brzustowicz, Axel T Brunger

  • 1Howard Hughes Medical Institute and Department of Molecular and Cellular Physiology, and Stanford Synchrotron Radiation Laboratory, Stanford University, James H. Clark Center E300, Stanford, California 94305, USA.

Acta Crystallographica. Section D, Biological Crystallography
|January 24, 2007
PubMed
Summary

A new ab initio molecular replacement method aids in phasing X-ray diffraction data for symmetric helical membrane proteins. This technique bypasses the need for prior structural knowledge or heavy-atom derivatives, simplifying structure determination.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Crystallography

Background:

  • Phasing X-ray diffraction data is crucial for protein structure determination.
  • Membrane proteins present unique challenges for structure determination due to their hydrophobic nature and complex environments.
  • Current phasing methods often require prior structural information or heavy-atom derivatives, which are not always available.

Purpose of the Study:

  • To develop an ab initio molecular replacement method for phasing X-ray diffraction data of symmetric helical membrane proteins.
  • To overcome the limitations of existing phasing techniques by not requiring prior structural knowledge or heavy-atom derivatives.
  • To enable structure determination of membrane proteins that are difficult to crystallize or derivatize.

Main Methods:

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  • Generation of idealized transmembrane helix models.
  • Utilizing geometrical and structural restraints specific to membrane proteins to reduce model complexity.
  • Molecular replacement searches using generated models.
  • Evaluation of results using noncrystallographic symmetry (NCS) map correlation, OMIT map correlation, and R(free) values.
  • Application to the mechanosensitive channel of large conductance (MscL) using 4 Å diffraction data.

Main Results:

  • Successfully phased X-ray diffraction data for MscL without prior structural information.
  • The method accurately determined the spatial organization and position of transmembrane helices.
  • Generated electron-density maps were of sufficient quality for automated model building of helical segments and the cytoplasmic domain.
  • Demonstrated feasibility with low-resolution (4 Å) data.

Conclusions:

  • The developed ab initio molecular replacement method is effective for phasing symmetric helical membrane proteins.
  • This approach simplifies structure determination by eliminating the need for prior structural knowledge or heavy-atom derivatives.
  • The method is applicable to membrane proteins with one or two helices per monomer and does not require high-resolution data.