TY - JOUR
T1 - A comparative study of impurity effects on protein crystallization
T2 - diffusive versus convective crystal growth
AU - Adawy, A.
AU - van der Heijden, E.G.G.
AU - Hekelaar, J.
AU - van Enckevort, W.J.P.
AU - de Grip, W.J.
AU - Vlieg, E.
PY - 2015/3/4
Y1 - 2015/3/4
N2 - The incorporation of impurities during protein crystallization is one of the main obstacles that prevents the growth of high quality crystals. Mass transport has been shown to affect the incorporation of impurities. Here we used a special growth configuration that enables the simultaneous investigation of the two main means of mass transport, diffusion and convection, under otherwise identical conditions. Two polymorphic forms of hen egg-white lysozyme were crystallized using this configuration in the presence of different types of impurities at various degrees of contamination. We found that even in the presence of impurities that are not easily segregated, the diffraction quality of crystals grown under diffusion-limited conditions is better than that of those grown in the presence of natural convection. The results also reveal a significant difference in impurity uptake for the different polymorphic forms of the same protein. The combined results show that also in the presence of large fractions of impurities, the more perfect crystals grow when the rate of accretion of molecules is slow and orderly, as accomplished under diffusion-limited conditions.
AB - The incorporation of impurities during protein crystallization is one of the main obstacles that prevents the growth of high quality crystals. Mass transport has been shown to affect the incorporation of impurities. Here we used a special growth configuration that enables the simultaneous investigation of the two main means of mass transport, diffusion and convection, under otherwise identical conditions. Two polymorphic forms of hen egg-white lysozyme were crystallized using this configuration in the presence of different types of impurities at various degrees of contamination. We found that even in the presence of impurities that are not easily segregated, the diffraction quality of crystals grown under diffusion-limited conditions is better than that of those grown in the presence of natural convection. The results also reveal a significant difference in impurity uptake for the different polymorphic forms of the same protein. The combined results show that also in the presence of large fractions of impurities, the more perfect crystals grow when the rate of accretion of molecules is slow and orderly, as accomplished under diffusion-limited conditions.
UR - http://www.scopus.com/inward/record.url?scp=84929175233&partnerID=8YFLogxK
U2 - 10.1021/cg501455d
DO - 10.1021/cg501455d
M3 - Article
AN - SCOPUS:84929175233
SN - 1528-7483
VL - 15
SP - 1150
EP - 1159
JO - Crystal Growth and Design
JF - Crystal Growth and Design
IS - 3
ER -