Chapter

Phase refinement through density modification

Jan Pieter Abrahams, Jasper R. Plaisier, Steven Ness and Navraj S. Pannu

in Macromolecular Crystallography

Published in print August 2007 | ISBN: 9780198520979
Published online September 2007 | e-ISBN: 9780191706295 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780198520979.003.0010
 Phase refinement through density modification

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This chapter discusses the concept of density modification, where a priori information about the structure of the macromolecule being studied is used to improve phase estimates. These concepts of density modification for the improvement of phases from crystallography have been implemented in many different programs in the past. Some of the popular density modification programs implementing the real space restraints are SOLOMON (Abrahams, 1997), DM (Cowtan, 1999), and RESOLVE (Terwilliger, 2003).

Keywords: X-ray diffraction; phase measurement; electron density; density modification

Chapter.  5600 words.  Illustrated.

Subjects: Biochemistry

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