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. 2018 Feb 8;293(12):4277–4288. doi: 10.1074/jbc.RA118.002006

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© 2018 Sherp et al.

Published under exclusive license by The American Society for Biochemistry and Molecular Biology, Inc.

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Figure 8. — Overview of IBA to IAA conversion and conjugation with amino acids by GH3 proteins in Arabidopsis. IBA is imported into the peroxisome, where it undergoes peroxisomal β-oxidation to IAA. Export of IAA out of the peroxisome leads to nuclear signaling events. AtGH3.1, AtGH3.2, AtGH3.5/WES1, and AtGH3.17/VAS2 are IAA-conjugating enzymes that produce IAA-Asn (AtGH3.1), IAA-Asp (AtGH3.2 and AtGH3.5/WES1), and AtGH3.17/VAS2 (IAA-Glu). AtGH3.15 conjugates IBA. Conjugation of IAA and IBA lead to inactivation and/or storage forms of these auxins.