ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The success of molecular replacement depends, in part, on the degree of similarity of the target and search molecules. We have systematically investigated this effect in cross-rotation functions for members of the aspartic proteinase family of enzymes. The influence of various parameters on peak heights was investigated for six search models using |Fobs| data for two target enzymes. The beneficial effects of high-resolution data and a large radius of integration are most pronounced when target and search molecules have high-percentage identities. Correction for small differences in domain–domain orientation (typically 4–8°) between search and target structures leads to only a marginal improvement in the rotation-function peak height. There is an almost linear relationship between the structural distance, D, a parameter used in cluster analysis to define differences between three-dimensional protein structures, and the height of the cross-rotation-function peaks.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S010876739200847X
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