Journal
ENZYME AND MICROBIAL TECHNOLOGY
Volume 36, Issue 2-3, Pages 280-284Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2004.08.038
Keywords
superoxide anions; H2O2; elicitor; Catharanthus roseus cells; catharanthine; PAL
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Elicitor, derived from the cell walls of Aspergillus niger, induced rapid generation of reactive oxygen intermediates (ROI), including superoxide anion (O-2(-)) and hydrogen peroxide (H2O2), sequentially followed by phenylalanine ammonia-lyase (PAL) activation and catharanthine biosynthesis in Catharanthus roseus suspension cells. The elicitor-induced PAL activation and catharanthine biosynthesis were blocked by NAD(P)H oxidase inhibitor, diphenylene iodonium (DPI). O-2(-) generated by the reaction of xanthine/xanthine oxidase (X/XO) triggered PAL activation and catharanthine biosynthesis of C. roseus cells in the absence of elicitor and reversed the inhibitory effect of DPI on elicitor-induced PAL activation and catharanthine biosynthesis. External application of H2O2 and catalase had no effect on PAL activity and catharanthine contents of C. roseus cells. The results demonstrated a causal relationship between elicitor-induced oxidative burst and PAL activation in C. roseus suspension cells and suggested a sequence of signaling events from ROI production to PAL activation and catharanthine synthesis. Within this sequence, O-2(-) rather than H2O2 appeared to trigger the subsequent reactions. (C) 2004 Elsevier Inc. All rights reserved.
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