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  1. Home
  3. Case Study Of Using The Single-atom R1 Method To Solve A Small Protein Structure.
  1. Home
  3. Case Study Of Using The Single-atom R1 Method To Solve A Small Protein Structure.

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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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Case study of using the single-atom R1 method to solve a small protein structure.

Xiaodong Zhang1

  • 1Chemistry Department, Tulane University, 6400 Freret Street, New Orleans, Louisiana 70118, USA.

Acta Crystallographica. Section A, Foundations and Advances
|June 25, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

The single-atom R1 (sR1) method struggled with a small protein until hidden solvent effects were addressed. Padding with carbon atoms, even if overcompensating, improved the sR1 method for solving small protein structures.

Keywords:
padding additional C atomssingle-atom R1solvent diffraction effectsstructure solution

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Area of Science:

  • Structural biology
  • Biophysics
  • Crystallography

Background:

  • The single-atom R1 (sR1) method is a technique used in structural biology.
  • Solving small protein structures can be challenging with existing methods.

Purpose of the Study:

  • To investigate challenges encountered with the sR1 method for small protein structures.
  • To identify and address factors hindering successful structure determination using sR1.

Main Methods:

  • Application of the single-atom R1 (sR1) method.
  • Hypothesizing and addressing hidden solvent diffraction effects.
  • Utilizing carbon atom padding to mitigate issues in sR1 calculations.

Main Results:

  • The sR1 method initially failed for a small protein, with many atoms being dubiously accepted.
  • A hidden solvent diffraction effect was hypothesized as the cause of failure.
  • Padding with additional carbon atoms successfully solved the small protein structure using sR1.
  • Analysis revealed that carbon atom padding may over-account for solvent content but still benefits the calculation.

    • Conclusions:

    • Hidden solvent diffraction effects can impede sR1 structure determination for small proteins.
    • Padding with carbon atoms, even if it overcompensates for solvent, can enhance the reliability and completeness of sR1 calculations.
    • This padding strategy offers a practical solution for overcoming initial difficulties in applying the sR1 method to challenging protein structures.