Correction of X-ray intensities from single crystals containing lattice-translocation defectsWang, J., Kamtekar, S., Berman, A.J., Steitz, T.A.
(2005) Acta Crystallogr D Biol Crystallogr 61: 67-74
- PubMed: 15608377
- DOI: https://doi.org/10.1107/S0907444904026721
- Primary Citation of Related Structures:
- PubMed Abstract:
In 1954, Howells and colleagues described an unusual diffraction pattern from imidazole methemoglobin crystals caused by lattice-translocation defects. In these crystals, two identical lattices coexist as a single coherent mosaic block, but are translated by a fixed vector with respect to each other. The observed structure is a weighted sum of the two identical but translated structures, one from each lattice; the observed structure factors are a weighted vector sum of the two structure factors with identical unit amplitudes but shifted phases. A general procedure is described to obtain the unit amplitudes of observed structure factors from a realigned single lattice through an X-ray intensity correction. An application of this procedure is made to determine the crystal structure of phi29 DNA polymerase at 2.2 A resolution using multiple isomorphous replacement and multiwavelength anomalous dispersion methods.
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