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A modified Crowther and Blow T1 translation function for partial search models
1Biology Department, Brookhaven National Laboratory, Upton, NY 11973-5000, USA.
Abstract:
A simple modification to the fast T(1) translation function of Crowther & Blow [Crowther & Blow (1967). Acta Cryst. 23, 544-548] can reduce systematic error in cases where the input set of oriented search models represents a fraction of the scattering matter of the unknown crystal unit cell. The observed Patterson function is modified by a partial self-vector subtraction (SVS) and then the residual Patterson origin is removed. In a test case where a protein/DNA complex crystal was searched using a protein-only model, the highest signal- to-noise ratios for translation-search maps were obtained either with origin removal alone or partial SVS combined with origin removal. Origin removal is likely to be a generally useful alternative to SVS for the function.
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