Organism
Arabidopsis thaliana
Function
Methylesterase shown to have carboxylesterase activity, methyl indole-3-acetic acid (MeIAA) esterase activity and methyl salicylate (MeSA) esterase activity in vitro. Required to convert methyl salicylate (MeSA) to salicylic acid (SA) as part of the signal transduction pathways that activate systemic acquired resistance in systemic tissue. MeSA is believed to be an inactive form that needs to be demethylated to exert a biological effect.
Similarity
Belongs to the AB hydrolase superfamily. Methylesterase family.
Sequence
MDKNNQKKFVLVHGICHGAWCWYKVKAQLEAAGHSVTAVDLAASGVNMTSLDEIQTLKDYCKPLLEFLSSLGSDDDKVILVAHSMGGISASLAADIFPSKVAAIVFVAAFMPDISNPPAYVFQKLVKDVTQEVWMDTVFGKPDRPLEFALFGPEFMAKYLYNLSPLQDFELAKMSVRVSPFMTNNLAGTISFSEDRYGSVTRIYIVCGEDVAVPVDYQRGMINDFPVKEVLEIKDADHMPMFSKPQELCALLLEIADKYA