Estimation of the quality of refined protein crystal structures.

ABSTRACT: Crystallographic R work and R free values, which are measures of the ability of the models of macromolecular structures to explain the crystallographic data on which they are based, are often used to assess structure quality. It is widely known, and confirmed here that both are sensitive to the methods used to compute them, and can be manipulated to improve the apparent quality of the model. As an alternative it is proposed here that the quality of crystallographic models should be assessed using a global goodness-of-fit metric RO2A /R work where RO2A is the number of reflections used for refinement divided by the number of nonhydrogen atoms in the structure, and R work is the working R-factor of the refined structure. Also, analysis of structures in the Protein Data Bank suggests that man

SUBMITTER: Wang J 

PROVIDER: S-EPMC4420517 | biostudies-literature | 2015 May

REPOSITORIES: biostudies-literature