Bioactive and structural metabolites of pseudomonas and burkholderia species causal agents of cultivated mushrooms diseases

• Published in: Perspectives in medicinal chemistry 2008-01, Vol.2, p.81-112
• Main Authors: Andolfi, Anna, Cimmino, Alessio, Cantore, Pietro Lo, Iacobellis, Nicola Sante, Evidente, Antonio
• Format: Article
• Language: English
• Subjects: Agaricus bisporus; Antimicrobial activity; Basidiocarps; bioactive metabolites; Burkholderia; Burkholderia gladioli; Cell culture; Diseases and pests; Erythrocytes; exopolysaccharides; Gram-positive bacteria; Health aspects; Lipid A; lipodepsipeptides; Lipopolysaccharides; Liposomes; Metabolites; Mushrooms; N.M.R; Pleurotus; Pseudomonas; Pseudomonas tolaasii; Spectroscopy; Structure-activity relationships
• ISSN: 1177-391X; 1177-391X
• DOI: 10.1177/1177391x0800200004

Pseudomonas tolaasii, P. reactans and Burkholderia gladioli pv. agaricicola, are responsible of diseases on some species of cultivated mushrooms. The main bioactive metabolites produced by both Pseudomonas strains are the lipodepsipeptides (LDPs) tolaasin I and II and the so called White Line Inducing Principle (WLIP), respectively, LDPs which have been extensively studied for their role in the disease process and for their biological properties. In particular, their antimicrobial activity and the alteration of biological and model membranes (red blood cell and liposomes) was established. In the case of tolaasin I interaction with membranes was also related to the tridimensional structure in solution as determined by NMR combined with molecular dynamic calculation techniques. Recently, five news minor tolaasins, tolaasins A-E, were isolated from the culture filtrates of P. tolaasii and their chemical structure was determined by extensive use of NMR and MS spectroscopy. Furthermore, their antimicrobial activity was evaluated on target micro-organisms (fungi-including the cultivated mushrooms Agaricus bisporus, Lentinus edodes, and Pleurotus spp.-chromista, yeast and bacteria). The Gram positive bacteria resulted the most sensible and a significant structure-activity relationships was apparent. The isolation and structure determination of bioactive metabolites produced by B. gladioli pv. agaricicola are still in progress but preliminary results indicate their peptide nature. Furthermore, the exopolysaccharide (EPS) from the culture filtrates of B. gladioli pv. agaricicola, as well as the O-chain and lipid A, from the lipopolysaccharide (LPS) of the three bacteria, were isolated and the structures determined.