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FOR CRYSTALLOGRAPHIC GROUPS OF
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Chirikjian Mathematical aspects of molecular replacement
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.
Acta Crystallographica Section A Foundations of Crystallography – Wiley
Published: Jan 1, 2011
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