If Jasmonate O-methyltransferase catalyzes the methylation of jasmonate into methyljasmonate
can same enzyme catalyzes the methylation of the free carboxyl end of the plant hormone indole-3-acetic acid (IAA) ?
Dear Dr. Dina Abdulmajid ,
To our knowledge the jasmonate O-methyltransferase catalyzes only the chemical reaction:
S-adenosyl-L-methionine + jasmonate ⇌ S-adenosyl-L-homocysteine + methyl jasmonate
Considering the pivotal role of the oxylipin pathway and the antagonism between jasmonic acids and auxins, it is very unlikely that the same enzyme would have high enough affinity for compounds in both pathways. However, it might be possible that there is a significant difference in affinity that would strengthen the antagonism between the pathways, as in the oxylipin pathway being repressed leading to lack of the compound with the most affinity and leaving the second one in the other pathway. Stil, it would need to be a concerted effect to prevent it from becoming a bottleneck.
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