Structural basis for prereceptor modulation of plant hormones by GH3 proteins - PubMed (original) (raw)

. 2012 Jun 29;336(6089):1708-11.

doi: 10.1126/science.1221863. Epub 2012 May 24.

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Structural basis for prereceptor modulation of plant hormones by GH3 proteins

Corey S Westfall et al. Science. 2012.

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 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.

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