Cerato-ulmin—a wilting toxin of Dutch elm disease fungus |
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Authors: | Kenneth J Stevenson Judie A Slater Shozo Takai |
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Institution: | Biochemistry Group, Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4 |
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Abstract: | Cerato-ulmin, a toxin produced by Ceratocystis ulmi, the causal agent of Dutch elm disease, has been characterized as a small protein (128 residues) with a MW of ca 13000. The protein has a high content of cystine, proline, leucine, serine and aspartic acid/asparagine; it is low in histidine, lysine, arginine, isoleucine, phenylalanine and tyrosine and does not contain cysteine, methionine, or tryptophan. The amino acid sequence of the N-terminal region is: H2N-Ala-Asp-Ser-Tyr-Asp-Pro-Cys-Thr-Gly-Leu-Leu-Gln-Lys-Ser-Pro-Gln-Cys-Cys-Asp-Thr-Asp-Ile-Leu-Gly-Val-Ser-Asp-Leu-Asp-Cys-. Toxic symptoms similar to those of Dutch elm disease can be elicited by cerato-ulmin in white elm shoot cuttings (Ulmus americana L.). |
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Keywords: | Dutch elm disease cerato-ulmin wilting toxin protein MW amino acid composition amino acid sequence |
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