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Related Experiment Videos

Phasing proteins at low resolution.

K M Andersson1, S Hovmöller

  • 1Structural Chemistry, Arrhenius Laboratory, University of Stockholm, Sweden. klasa@struc.su.se

Acta Crystallographica. Section D, Biological Crystallography
|November 1, 1996
PubMed
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This study presents a novel method to determine protein phases using low-order reflections. Accurate phase determination aids in understanding protein size and low-resolution shape, crucial for structural biology.

Area of Science:

  • Crystallography
  • Structural Biology
  • Biophysics

Background:

  • Determining the phase information of reflections is critical for solving protein structures.
  • Existing methods for phase determination can be complex and time-consuming.
  • Low-resolution data often contains valuable information about molecular shape and size.

Purpose of the Study:

  • To develop a method for accurately obtaining phases of low-order reflections for protein crystallography.
  • To leverage the physical properties of proteins, such as uniform electron density and spherical shape, for phase determination.
  • To provide a reliable starting set of phases for phase extension in protein structure determination.

Main Methods:

  • Utilizing observations of smooth, uniform protein electron density at low resolution.

Related Experiment Videos

  • Applying knowledge of protein volume based on known molecular weight.
  • Exploiting the scattering behavior of spherical objects and their phase relationships.
  • Accurately positioning the center of gravity from low-order reflection data.

    • Main Results:

    • Accurate determination of phases for typically the ten lowest resolution reflections.
    • Successful phase determination is contingent on accurate measurement of low-order reflections and precise positioning of the center of gravity.
    • The method provides a robust starting set for phase extension.

    Conclusions:

    • The developed method enables precise determination of protein phases from low-order reflections.
    • This approach facilitates the acquisition of the molecular envelope (size and low-resolution shape) of unknown proteins.
    • The obtained phases serve as a valuable starting point for advanced crystallographic studies and structural elucidation.