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Pre-Receptor Enzyme Action by GH3 Enzymes. Modification of jasmonic acid (JA) and indole-3-acetic acid (IAA; auxin) directly effects plant hormone potency. Conjugation of JA with isoleucine by AtGH3-11 leads to formation of the active jasmonate hormone (+)-JA-Ile (top part). Conjugation of IAA with aspartate by OsGH3-8 yields IAA-Asp, which leads to degradation of the active hormone (bottom part). Red and green correspond to inactive and active hormone forms, respectively.
