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Plant Physiology 98:225-229 (1992)
© 1992 American Society of Plant Biologists

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Environmental and Stress Physiology

Cadmium-Sulfide Crystallites in Cd-({gamma}EC)nG Peptide Complexes from Tomato 1

R. Neil Reese, Cindy A. White and Dennis R. Winge

Department of Biology/Microbiology, South Dakota State University, Brookings, South Dakota 57007, Department of Medicine, University of Utah Medical Center, Salt Lake City, Utah 84132, Department of Biochemistry, University of Utah Medical Center, Salt Lake City, Utah 84132

Hydroponically grown tomato plants (Lycopersicon esculentum P. Mill. cv Golden Boy) exposed to 100 micromolar cadmium sulfate produced metal-({gamma}EC)nG peptide complexes containing acid-labile sulfur. The properties of the complexes resemble those of the cadmium-({gamma}EC)nG peptide complexes from Schizosaccharomyces pombe and Candida glabrata known to contain a cadmium sulfide crystallite core. The crystallite is stabilized by a sheath of peptides of general structure ({gamma}Glu-Cys)n-Gly. The cadmium-peptide complexes of tomato contained predominantly peptides of n3, n4, and n5. spectroscopic analyses indicated that the tomato cadmium-sulfide-peptide complex contained CdS crystallite core particles smaller than 2.0 nanometers in diameter.

1 R.N.R. was supported in part by a South Dakota State University Research Fund Grant. D.R.W. received support from National Institutes of Health grants ES 03817 and ES 00147.




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