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Crystals 2017, 7(6), 170; doi:10.3390/cryst7060170

Effect of an External Electric Field on the Kinetics of Dislocation-Free Growth of Tetragonal Hen Egg White Lysozyme Crystals

Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Received: 28 April 2017 / Revised: 30 May 2017 / Accepted: 9 June 2017 / Published: 10 June 2017
(This article belongs to the Special Issue Protein Crystallization under the Presence of an Electric Field)
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Abstract

Dislocation-free tetragonal hen egg white (HEW) lysozyme crystals were grown from a seed crystal in a cell. The rates of tetragonal HEW lysozyme crystal growth normal to the (110) and (101) faces with and without a 1-MHz external electric field were measured. A decrease in the typical growth rates of the crystal measured under an applied field at 1 MHz was observed, although the overall driving force increased. Assuming that the birth and spread mechanism of two-dimensional nucleation occurs, an increase in the effective surface energy of the step ends was realized in the presence of the electric field, which led to an improvement in the crystal quality of the tetragonal HEW lysozyme crystals. This article also discusses the increase in the effective surface energy of the step ends with respect to the change in the entropy of the solid. View Full-Text
Keywords: protein crystals; growth kinetics; electric field; crystal quality protein crystals; growth kinetics; electric field; crystal quality
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Koizumi, H.; Uda, S.; Fujiwara, K.; Okada, J.; Nozawa, J. Effect of an External Electric Field on the Kinetics of Dislocation-Free Growth of Tetragonal Hen Egg White Lysozyme Crystals. Crystals 2017, 7, 170.

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