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Removal of a methyl group of the allosamizoline moiety of allosamidin decreases the inhibitory effect on family 18 chitinases from three different species (a bacterium, Serratia marcescens, a crustacean, Artemia salina, and an insect cell line, Chironomus tentans). Loss of a second methyl group weakens enzyme inhibition further. This is in agreement with the highly conserved catalytic centre of these enzymes.
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Spindler et al. (1997) studied this question.
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