Amino Acid Composition of the Host-specific Toxin of Helminthosporium carbonum
- 1 December 1971
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 48 (6), 756-759
- https://doi.org/10.1104/pp.48.6.756
Abstract
The host-specific toxin of Helminthosporium carbonum (C32H50N6O10) was hydrolyzed by 6 n HCl to yield a number of α-amino acids. The common amino acids, proline and alanine, occurred in a ratio of 1:2. Two other unstable α-amino acids that produced lower color values with ninhydrin were also produced. One of these was tentatively identified as 2-amino-2,3-dehydro-3-methylpentanoic acid by electrolytic reduction to isoleucine. Additional ninhydrin-reacting substances were produced in low yield and probably represented secondary hydrolysis products of the unstable amino acids. The finding of an α,β-unsaturated linkage in H. carbonum toxin explains the instability of the compound and may also account for its specific toxicity.Keywords
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