A new additive for protein crystallization

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The potential usefulness of the new zwitterionic solubilizing agent, dimethyl ethylammonium propane sulfonate (NDSB195), in protein crystallization was shown using hen egg-white lysozyme. In the presence of this agent, highly diffracting crystals were obtained using ammonium sulphate as a precipitant, whereas in its absence only amorphous precipitates were obtained. The crystals possess a triclinic unit cell not previously described and diffract to a resolution of 2 Å. To ascertain that the new reagent had not produced significant changes in the protein fold the structure was determined to a resolution of 2.6 Å. Only minor differences were observed (notably in regions of crystal contacts) with the known tetragonal lysozyme structure (Brookhaven Protein Data Bank entry 1HEL). © 1994.

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Vuillard, L., Rabilloud, T., Leberman, R., Berthet-Colominas, C., & Cusack, S. (1994). A new additive for protein crystallization. FEBS Letters, 353(3), 294–296. https://doi.org/10.1016/0014-5793(94)01060-9

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