Joint X-ray and Neutron Refinement with Phenix.refine

Overview

Journal Acta Crystallogr D Biol Crystallogr

Specialty Chemistry

Date 2010 Nov 3

PMID 21041930

Citations 165

Authors

Pavel V Afonine

Marat Mustyakimov

Ralf W Grosse-Kunstleve

Nigel W Moriarty

Paul Langan

Paul D Adams

Affiliations

Soon will be listed here.

Abstract

Approximately 85% of the structures deposited in the Protein Data Bank have been solved using X-ray crystallography, making it the leading method for three-dimensional structure determination of macromolecules. One of the limitations of the method is that the typical data quality (resolution) does not allow the direct determination of H-atom positions. Most hydrogen positions can be inferred from the positions of other atoms and therefore can be readily included into the structure model as a priori knowledge. However, this may not be the case in biologically active sites of macromolecules, where the presence and position of hydrogen is crucial to the enzymatic mechanism. This makes the application of neutron crystallography in biology particularly important, as H atoms can be clearly located in experimental neutron scattering density maps. Without exception, when a neutron structure is determined the corresponding X-ray structure is also known, making it possible to derive the complete structure using both data sets. Here, the implementation of crystallographic structure-refinement procedures that include both X-ray and neutron data (separate or jointly) in the PHENIX system is described.

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