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1 Acta Biochimica Polonica

1 2004

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Novel oligosaccharides isolated from Fusarium oxysporum L. rapidly induced PAL activity in Rubus cells

100%

Nita-Lazar M. , Heyraud A. , Gey C. , Braccini I. , Lienart Y.

Acta Biochimica Polonica

2004

tom 51

nr 3

Activation of the phenolic pathway is known to be part of a defense response against cell wall-derived elicitors from pathogens. Many examples of a defense response by increasing the synthesis of phenolic compound against the elicitor were demonstrated in the past, but the elicitor structure has so far been poorly characterized. Our results indicate that a disaccharide fraction containing the following structure: a-D-mannopyranosyl (1=>2)a/ß-D-glucopyranosyl and a-D-mannopyranosyl (1=>x) inositol, isolated from Fusarium oxysporum L., promotes rapid and transient phenylalanine ammonia lyase activity in Rubus fructicosus cells at nanomolar concentration. The disaccharides were isolated by size-exclusion chromatography directly from extracts obtained by alkaline treatment of F. oxysporum mycelium. Their structure was determined by 500-MHz-1H-NMR spectroscopy combined with methylation analysis and fast atom bombardment mass spectrometry.