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“Addition of putrescine to the control or resistant cells had no effect on their content of spermidine and spermine but addition of decarboxylated S-adenosylmethionine increased the content of spermidine and spermine.”
“Exogenously added polyamines had little effect on ornithine decarboxylase, whereas S-adenosylmethionine and arginine decarboxylase activities rapidly diminished with added spermidine or spermine.”
The Journal of biological chemistry • 1986 | View Paper
“These findings suggest that the availability of decarboxylated S-adenosylmethionine may be rate-limiting for the synthesis of spermine in plant protoplasts.”