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Research article2003Peer reviewedOpen access

MIR phasing using merohedrally twinned crystals

van Scheltinga ACT, Valegard K, Hajdu J, Andersson I

Abstract

Merohedral twinning is a crystal-growth disorder that seriously hinders the determination of macromolecular crystal structures by isomorphous replacement. The strategies used in the structures solved so far are discussed. Several methods can be used to determine the extent of twinning, the twin fraction and to detwin the data. Accurate determination of the twin fraction by analysing heavy-atom refinement statistics is possible, but only influences the resulting phases slightly. It seems more crucial to restrict the variation in twin fractions between data sets, either by making the twin fractions of some data sets artificially higher or by screening crystals to obtain data with a low twin fraction

Keywords

MIR phasing; merohedral twinning

Published in

Acta Crystallographica Section D: Biological Crystallography
2003, Volume: 59, pages: 2017-2022
Publisher: BLACKWELL MUNKSGAARD

      SLU Authors

    • Andersson, Inger

      • Department of Molecular Biology, Swedish University of Agricultural Sciences
      • Terwisscha Van Scheltinga, Anke

        • Department of Molecular Biology, Swedish University of Agricultural Sciences
        • Valegård, Karin

          • Department of Molecular Biology, Swedish University of Agricultural Sciences

        UKÄ Subject classification

        Food Science

        Publication identifier

        DOI: https://doi.org/10.1107/S090744490302122X

        Permanent link to this page (URI)

        https://res.slu.se/id/publ/2464