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Mathematical aspects of molecular replacement. I. Algebraic properties of motion spaces

Mathematical aspects of molecular replacement. I. Algebraic properties of motion spaces Molecular replacement (MR) is a well established method for phasing of X‐ray diffraction patterns for crystals composed of biological macromolecules of known chemical structure but unknown conformation. In MR, the starting point is known structural domains that are presumed to be similar in shape to those in the macromolecular structure which is to be determined. A search is then performed over positions and orientations of the known domains within a model of the crystallographic asymmetric unit so as to best match a computed diffraction pattern with experimental data. Unlike continuous rigid‐body motions in Euclidean space and the discrete crystallographic space groups, the set of motions over which molecular replacement searches are performed does not form a group under the operation of composition, which is shown here to lack the associative property. However, the set of rigid‐body motions in the asymmetric unit forms another mathematical structure called a quasigroup, which can be identified with right‐coset spaces of the full group of rigid‐body motions with respect to the chiral space group of the macromolecular crystal. The algebraic properties of this space of motions are articulated here. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A Foundations of Crystallography Wiley

Mathematical aspects of molecular replacement. I. Algebraic properties of motion spaces

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References (68)

Publisher
Wiley
Copyright
Copyright © 2011 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0108-7673
eISSN
1600-5724
DOI
10.1107/S0108767311021003
pmid
21844648
Publisher site
See Article on Publisher Site

Abstract

Molecular replacement (MR) is a well established method for phasing of X‐ray diffraction patterns for crystals composed of biological macromolecules of known chemical structure but unknown conformation. In MR, the starting point is known structural domains that are presumed to be similar in shape to those in the macromolecular structure which is to be determined. A search is then performed over positions and orientations of the known domains within a model of the crystallographic asymmetric unit so as to best match a computed diffraction pattern with experimental data. Unlike continuous rigid‐body motions in Euclidean space and the discrete crystallographic space groups, the set of motions over which molecular replacement searches are performed does not form a group under the operation of composition, which is shown here to lack the associative property. However, the set of rigid‐body motions in the asymmetric unit forms another mathematical structure called a quasigroup, which can be identified with right‐coset spaces of the full group of rigid‐body motions with respect to the chiral space group of the macromolecular crystal. The algebraic properties of this space of motions are articulated here.

Journal

Acta Crystallographica Section A Foundations of CrystallographyWiley

Published: Jan 1, 2011

Keywords: ; ; ; ;

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