The abscisic acid receptor PYR1 in complex with abscisic acid.

来自 Nature

喜欢 0

阅读量：

301

作者：

J Santiago，F Dupeux，A Round，R Antoni，SY Park，M Jamin，SR Cutler，PL Rodriguez，JA Marquez

展开

摘要：

The plant hormone abscisic acid (ABA) has a central role in coordinating the adaptive response in situations of decreased water availability as well as the regulation of plant growth and development. Recently, a 14-member family of intracellular ABA receptors, named PYR/PYL/RCAR, has been identified. These proteins inhibit in an ABA-dependent manner the activity of a family of key negative regulators of the ABA signalling pathway: the group-A protein phosphatases type 2C (PP2Cs). Here we present the crystal structure of Arabidopsis thaliana PYR1, which consists of a dimer in which one of the subunits is bound to ABA. In the ligand-bound subunit, the loops surrounding the entry to the binding cavity fold over the ABA molecule, enclosing it inside, whereas in the empty subunit they form a channel leaving an open access to the cavity, indicating that conformational changes in these loops have a critical role in the stabilization of the hormone-receptor complex. By providing structural details on the ABA-binding pocket, this work paves the way for the development of new small molecules able to activate the plant stress response.

展开

关键词：

Arabidopsis Abscisic Acid Protein Structure, Tertiary Protein Binding Models, Molecular Membrane Transport Proteins Arabidopsis Proteins

DOI：

10.1038/nature08591

被引量：

711

年份：

2009