Amino Acid Sequence and Toxicity of the Elicitin Secreted with Ubiquitin by Phytophthora infestans. Jean Claude Huet. Laboratoire d'Etude des Proteines, Department de Physiologie et Biochimie vegetales, INRA, Versailles, Route de St Cyr, F-78026 Versailles Cedex, France. Mauricette Salle-Tourne, and Jean-Claude Pernollet. Laboratoire d'Etude des Proteines, Department de Physiologie et Biochimie vegetales, INRA, Versailles, Route de St Cyr, F-78026 Versailles Cedex, France. MPMI 7:302-304. Accepted 28 December 1993. Copyright 1994 The American Phytopathological Society.

A single a elicitin, phytotoxin secreted by Phytophthora infestans, responsible for systemic HR-Iike necroses in tobacco, was purified from the culture filtrate. Its sequence was compared to other a elicitins in correlation with toxicity. In the filtrate, we also found ubiquitin, whose biological function remains unclear.