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Expanding the model: anisotropic displacement parameters in protein structure refinement.

¹Department of Biological Structure, University of Washington, Seattle, WA 98195-7742, USA. merritt@u.washington.edu

Acta Crystallographica. Section D, Biological Crystallography

|May 18, 1999

Summary

High-resolution protein structures reveal consistent atomic motion patterns. Including anisotropic displacement parameters (ADPs) significantly improves structural models and aids in validating crystallographic data.

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Area of Science:

Structural Biology
Crystallography
Biophysics

Background:

Technological advancements enable atomic-resolution protein structure determination.
Expanded structural models incorporating anisotropic displacement parameters (ADPs) require new analysis tools.

Purpose of the Study:

To analyze the distribution of anisotropy in protein structures with ADPs.
To assess the utility of ADP analysis for model validation and refinement.

Main Methods:

Utilized the PARVATI tool to examine protein structures from the Protein Data Bank with expanded ADP models.
Analyzed a dataset of protein structures with peptide chains exceeding 50 residues.

Main Results:

A consistent distribution of anisotropy was observed across all examined protein models.

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Mean anisotropy values ranged from 0.4-0.5, differing significantly from isotropic models.

Inclusion of ADPs substantially improved crystallographic residuals (R and Rfree).

Conclusions:

The observed anisotropy distribution is valuable for validating high-resolution protein structures.
Understanding anisotropy can lead to improved protein structural models, even at lower resolutions.