Structural basis for prereceptor modulation of plant hormones by GH3 proteins.Westfall, C.S., Zubieta, C., Herrmann, J., Kapp, U., Nanao, M.H., Jez, J.M.
(2012) Science 336: 1708-1711
- PubMed: 22628555
- DOI: 10.1126/science.1221863
- Primary Citation of Related Structures:
- Also Cited By: 5ECR, 5ECQ, 5ECP, 5ECO, 5ECN, 5ECM, 5ECL, 5ECK, 5ECI, 5ECH
- PubMed Abstract:
Acyl acid amido synthetases of the GH3 family act as critical prereceptor modulators of plant hormone action; however, the molecular basis for their hormone selectivity is unclear. Here, we report the crystal structures of benzoate-specific Arabidops ...
Acyl acid amido synthetases of the GH3 family act as critical prereceptor modulators of plant hormone action; however, the molecular basis for their hormone selectivity is unclear. Here, we report the crystal structures of benzoate-specific Arabidopsis thaliana AtGH3.12/PBS3 and jasmonic acid-specific AtGH3.11/JAR1. These structures, combined with biochemical analysis, define features for the conjugation of amino acids to diverse acyl acid substrates and highlight the importance of conformational changes in the carboxyl-terminal domain for catalysis. We also identify residues forming the acyl acid binding site across the GH3 family and residues critical for amino acid recognition. Our results demonstrate how a highly adaptable three-dimensional scaffold is used for the evolution of promiscuous activity across an enzyme family for modulation of plant signaling molecules.
Department of Biology, Washington University, St. Louis, MO 63130, USA.