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• W2000821778 abstract "We have previously shown that chitosan stimulates anthraquinone synthesis in Rubia tinctorum L. cells through activation of the PLCPKC, PI3K, MAPK and Ca 2+ messenger systems. In view of this evidence, we have now investigated whether guanine nucleotide‐binding G‐proteins are part of the signal transduction mechanism which mediates the elicitor action. The G‐protein agonists mastoparan, AlF 4 – and GTPyS increased anthraquinone levels to the same extent as chitosan. No additive effects were observed when cultured R. tinctorum cells were treated with agonist and the elicitor together. In agreement with these observations, the G‐protein antagonists suramin and GDPβS abolished the increase in anthraquinone synthesis induced by chitosan. Furthermore, elicitation was not affected in the presence of pertussis toxin. Consistent with this result, when cell cultures were preincubated with a monoclonal anti‐Gαq11 antibody, the chitosan‐dependent increase in anthraquinone levels was fully inhibited. Moreover, the presence of an immunoreactive protein of the expected size for Gαq11 (42 kDa) was observed in R. tinctorum microsomal membranes by Western blot analysis using the same antibody. These results indicate that chitosan stimulates anthraquinone synthesis in R. tinctorum cells through a heterotrimeric G‐protein, most likely belonging to the Gαq family." @default.
• W2000821778 created "2016-06-24" @default.
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• W2000821778 date "2006-07-07" @default.
• W2000821778 modified "2023-09-30" @default.
• W2000821778 title "Involvement of G-proteins in chitosan-induced Anthraquinone synthesis in Rubia tinctorum" @default.
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• W2000821778 doi "https://doi.org/10.1111/j.1399-3054.2006.00717.x" @default.
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