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Molecular Evolution of the Tre Recombinase
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Molecular replacement then and now.

Giovanna Scapin1

  • 1Global Structural Chemistry, Merck and Co. Inc, 2000 Galloping Hill Road, Kenilworth, NJ 07033, USA.

Acta Crystallographica. Section D, Biological Crystallography
|November 6, 2013
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The molecular replacement (MR) method is crucial for solving the crystallography phase problem. Success in MR relies heavily on selecting a high-quality search model, emphasizing sequence identity and structural similarity.

Keywords:
accuracymodelsmolecular replacementquality

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Area of Science:

  • Crystallography
  • Structural Biology
  • X-ray Diffraction

Background:

  • The crystallography phase problem arises from the inability to directly measure X-ray wave phases.
  • Intensities are measured, but phase information requires alternative methods like molecular replacement (MR).
  • Existing phasing methods (MIR, SAR, MAD, SAD, MR) depend on knowing marker atom positions.

Purpose of the Study:

  • To provide a personal overview of the development, application, and requirements of molecular replacement (MR).
  • To highlight the critical factors influencing the success of MR in structure determination.

Main Methods:

  • Review of the historical development of molecular replacement (MR).
  • Discussion of modern computational approaches, including six-dimensional searches and brute-force methods.
  • Emphasis on the selection criteria for optimal search models in MR.

Main Results:

  • Molecular replacement (MR) is the most popular method for solving the phase problem in crystallography.
  • The success of MR is significantly influenced by the resolution range, data quality, and critically, the choice of search model.
  • Key parameters for selecting a search model include sequence identity (≥25%) and structural similarity.

Conclusions:

  • The quality of the probe (search model) is paramount for successful molecular replacement (MR).
  • Structural biologists should prioritize depositing high-quality structures to serve as reliable probes for future studies.
  • Ensuring the quality of deposited structures is essential for advancing molecular replacement methodologies.