2ZSI: Structural Basis Of Gibberellin(Ga4)-Induced Della Recognition By The Gibberellin Receptor

Citation:
Abstract
Gibberellins control a range of growth and developmental processes in higher plants and have been widely used in the agricultural industry. By binding to a nuclear receptor, GIBBERELLIN INSENSITIVE DWARF1 (GID1), gibberellins regulate gene expression by promoting degradation of the transcriptional regulator DELLA proteins, including GIBBERELLIN INSENSITIVE (GAI). The precise manner in which GID1 discriminates and becomes activated by bioactive gibberellins for specific binding to DELLA proteins remains unclear. Here we present the crystal structure of a ternary complex of Arabidopsis thaliana GID1A, a bioactive gibberellin and the amino-terminal DELLA domain of GAI. In this complex, GID1A occludes gibberellin in a deep binding pocket covered by its N-terminal helical switch region, which in turn interacts with the DELLA domain containing DELLA, VHYNP and LExLE motifs. Our results establish a structural model of a plant hormone receptor that is distinct from the mechanism of the hormone perception and effector recognition of the known auxin receptors.
PDB ID: 2ZSIDownload
MMDB ID: 68099
PDB Deposition Date: 2008/9/10
Updated in MMDB: 2008/12
Experimental Method:
x-ray diffraction
Resolution: 1.8  Å
Source Organism:
Similar Structures:
Biological Unit for 2ZSI: dimeric; determined by author and by software (PISA)
Molecular Components in 2ZSI
Label Count Molecule
Proteins (2 molecules)
1
Probable Gibberellin Receptor Gid1l1(Gene symbol: GID1A)
Molecule annotation
1
Della Protein GAI(Gene symbol: GAI)
Molecule annotation
Chemical (1 molecule)
1
1
* Click molecule labels to explore molecular sequence information.

Citing MMDB
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