A conformation-dependent stereochemical library improves crystallographic refinement even at atomic resolution

作者：Tronrud Dale E; Karplus P Andrew^*

来源：Acta Crystallographica Section D-Biological Crystallography, 2011, 67(8): 699-706.

DOI：10.1107/S090744491102292X

To utilize a new conformation-dependent backbone-geometry library (CDL) in protein refinements at atomic resolution, a script was written that creates a restraint file for the SHELXL refinement program. It was found that the use of this library allows models to be created that have a substantially better fit to main-chain bond angles and lengths without degrading their fit to the X-ray data even at resolutions near 1 angstrom. For models at much higher resolution (similar to 0.7 angstrom), the refined model for parts adopting single well occupied positions is largely independent of the restraints used, but these structures still showed much smaller r.m.s.d. residuals when assessed with the CDL. Examination of the refinement tests across a wide resolution range from 2.4 to 0.65 angstrom revealed consistent behavior supporting the use of the CDL as a next-generation restraint library to improve refinement. CDL restraints can be generated using the service at http://pgd.science.oregonstate.edu/cdl_shelxl/.

• 出版日期2011-8