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Protein Science, Vol 7, Issue 3 600-604, Copyright © 1998 by Cold Spring Harbor Laboratory Press

ARTICLE

Cadmium-induced crystallization of proteins: II. Crystallization of the Salmonella typhimurium histidine-binding protein in complex with L-histidine, L-arginine, or L-lysine

S. TRAKHANOV, D. I. KREIMER, S. PARKIN, GFL. AMES and B. RUPP
Department of Molecular and Cellular Biology, Division of Biochemistry and Molecular Biology, University of California, Berkeley, California 94720 Lawrence Livermore National Laboratory, Biology and Biotechnology Research Program, L-452, University of California, Livermore, California 94550

To further investigate favorable effects of divalent cations on the formation of protein crystals, three complexes of Salmonella typhimurium histidine-binding protein were crystallized with varying concentrations of cadmium salts. For each of the three histidine-binding protein complexes, cadmium cations were found to promote or improve crystallization. The optimal cadmium concentration is ligand specific and falls within a narrow concentration range. In each case, crystals grown in the presence of cadmium diffract to better than 2.0 A resolution and belong to the orthorhombic space group P2(1)2(1)2(1). From our results and from the analysis of cadmium sites in well-refined protein structures, we propose that cadmium addition provides a generally useful technique to modify crystal morphology and to improve diffraction quality.
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