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Comparing anisotropic displacement parameters in protein structures.

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

Acta Crystallographica. Section D, Biological Crystallography

|February 10, 2000

Summary

Researchers developed a new method to compare atomic details in protein structures. This helps understand the physical significance of anisotropic displacement parameters (ADPs) in macromolecular crystallography.

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Area of Science:

Structural biology
Macromolecular crystallography

Background:

Advancements in synchrotron radiation and cryo-preparation enable high-resolution macromolecular structure determination.
High-resolution structures allow for the inclusion of anisotropic displacement parameters (ADPs) for individual atoms.

Purpose of the Study:

To explore the physical significance of anisotropic displacement parameters (ADPs) in protein structures.
To develop a quantitative method for comparing electron density distributions of crystallographically independent atoms.

Main Methods:

Derivation of a real-space correlation coefficient for comparing atoms with anisotropic displacement parameters (ADPs).
Application of the correlation coefficient to protein structural models from the Protein Data Bank.

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Main Results:

An easily calculated correlation coefficient was derived.
The method allows quantitative comparison of electron density distributions.

Conclusions:

The developed measure facilitates the investigation of similarities between chemically equivalent but crystallographically independent atoms.
This approach aids in understanding the physical significance of ADPs in protein structures.