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A modified phase-retrieval algorithm to facilitate automatic de novo macromolecular structure determination in

Xingke Fu1, Zhi Geng2, Zhichao Jiao1

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

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|June 21, 2024
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Summary

A new phase-retrieval algorithm improves heavy atom substructure determination in macromolecular crystallography. This enhanced method, using combined phase perturbation and tangent formulas, offers accurate and automated single-wavelength anomalous diffraction (SAD) phasing.

Keywords:
SADautomatic de novo structure determinationmacromolecular crystallographyphase-retrieval algorithmsingle-wavelength anomalous diffractionsubstructure determinationtangent formula

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Area of Science:

  • Macromolecular crystallography
  • Structural biology
  • Biophysics

Background:

  • Accurate heavy atom positioning is crucial for experimental phasing in macromolecular crystallography.
  • Substructure determination is a key step in solving crystal structures.

Purpose of the Study:

  • To develop an improved phase-retrieval algorithm for enhanced substructure determination in single-wavelength anomalous diffraction (SAD) experiments.
  • To increase the accuracy and efficiency of SAD phasing for macromolecular structures.

Main Methods:

  • Development of a modified phase-retrieval algorithm based on the relaxed alternating averaged reflection (RAAR) framework.
  • Integration of π-half phase perturbation for weak reflections and tangent formula for strong reflections.
  • Extensive testing on 100 diverse SAD experimental datasets (protein and nucleic acid structures).

Main Results:

  • The modified algorithm demonstrated significantly improved effectiveness and accuracy in SAD substructure determination compared to the standard RAAR algorithm.
  • The algorithm's self-adaptive parameters allow for largely automated operation, facilitating integration into structural determination pipelines.
  • Experimental validation confirmed the possibility of automatic de novo structure determination using the proposed algorithm with the IPCAS software suite.

Conclusions:

  • The developed modified RAAR algorithm provides a more effective and accurate approach to SAD substructure determination.
  • The algorithm's automation capabilities streamline the structural determination process.
  • This advancement enables efficient and automated de novo structure determination in macromolecular crystallography.