Crystallization of native source <i>E. coli</i> proteins.

<p>(A) Capillary electrophoresis of purified protein fractions. White stars indicate samples successfully crystallized and black stars represent solved structures. (B) Crystals of 5-keto-4-deoxyuronate isomerase crystallized from fractions of varying purity. Crystal quality was not always correlated with sample purity. (C) Resolution of the data collected versus percent purity of the starting sample based on quantification of protein concentrations by capillary gel electrophoresis with the Caliper system. Sample purity did not correlate with higher resolution data.