In plants, GH3 proteins act as molecular on/off switches that control bioactive plant hormone formation by catalyzing the addition of specific amino acids to jasmonic acid, auxin, and benzoates. X-ray structures of GH3 proteins reveal a common three-dimensional fold but variability in the hormone binding site. This figure shows the variation in the jasmonic acid binding site of Arabidopsis thaliana GH3.11/JAR1 (gold) and the salicylic acid binding site of A. thaliana GH3.12/PBS3 (green).
Credit or Source: Argonne National Laboratory
US DOE. 2013. DOE User Facilities Advanced Technologies for Biology: Synchrotron and Neutron Beam Facilities Accelerating Biological Research, US Department of Energy Office of Science. (p. 2)