Crystallization and X-ray Analysis of Stemphyloxin I, a Phytotoxin from Stemphylium botryosum

See allHide authors and affiliations

Science  03 Jun 1983:
Vol. 220, Issue 4601, pp. 1065-1066
DOI: 10.1126/science.220.4601.1065


Certain isolates of the plant-pathogenic fungus Stemphylium botryosum produce a phytotoxin, stemphyloxin I. This toxin (C21H34O6) was crystallized and its structure was determined by x-ray crystallography to be a β-ketoaldehyde trans-Decalin. This compound is a highly unusual natural product. Iron (Fe3+) controls production of toxin by this fungus. Furthermore, iron reacts with the toxin to yield a colored product which aids in its detection on chromatograms and in its quantitative estimation by colorimetry.;