Plants use special enzymes to deactivate the growth hormone auxin by attaching different amino acids to it. This study shows that two families of these enzymes have distinct preferences — one favors aspartate, the other glutamine — a division that is conserved across plant species.
1
NtGH3.1a (and its Arabidopsis counterpart AtGH3.1) preferentially conjugates auxin (IAA) with aspartate, producing IAA-Asp as the main inactivation product.
2
NtGH3.6e (and Arabidopsis AtGH3.5/6) preferentially conjugates auxin with glutamine, producing the less-studied conjugates IAA-Gln and oxIAA-Gln.
3
Both enzyme types localize to the nucleus and cytoplasm regardless of auxin levels, suggesting their distribution is not dynamically regulated by the hormone they inactivate.
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