6R89

Structure of Arabidopsis thaliana GLR3.3 ligand-binding domain in complex with L-cysteine

6R89 の概要

• エントリーDOI: 10.2210/pdb6r89/pdb
• 関連するPDBエントリー: 6R85 6R88
• 分子名称: Glutamate receptor 3.3,Glutamate receptor 3.3, CYSTEINE, SODIUM ION, ... (6 entities in total)
• 機能のキーワード: glutamate receptor-like, amino acid-binding, membrane protein
• 由来する生物種: Arabidopsis thaliana (thale cress); 詳細
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 108441.27

構造登録者

Alfieri, A.,Pederzoli, R.,Costa, A. (登録日: 2019-04-01, 公開日: 2020-01-01, 最終更新日: 2024-01-24)

主引用文献

Alfieri, A.,Doccula, F.G.,Pederzoli, R.,Grenzi, M.,Bonza, M.C.,Luoni, L.,Candeo, A.,Romano Armada, N.,Barbiroli, A.,Valentini, G.,Schneider, T.R.,Bassi, A.,Bolognesi, M.,Nardini, M.,Costa, A.
The structural bases for agonist diversity in anArabidopsis thalianaglutamate receptor-like channel.
Proc.Natl.Acad.Sci.USA, 117:752-760, 2020

PubMed Abstract: glutamate receptor-like (GLR) channels are amino acid-gated ion channels involved in physiological processes including wound signaling, stomatal regulation, and pollen tube growth. Here, fluorescence microscopy and genetics were used to confirm the central role of GLR3.3 in the amino acid-elicited cytosolic Ca increase in seedling roots. To elucidate the binding properties of the receptor, we biochemically reconstituted the GLR3.3 ligand-binding domain (LBD) and analyzed its selectivity profile; our binding experiments revealed the LBD preference for l-Glu but also for sulfur-containing amino acids. Furthermore, we solved the crystal structures of the GLR3.3 LBD in complex with 4 different amino acid ligands, providing a rationale for how the LBD binding site evolved to accommodate diverse amino acids, thus laying the grounds for rational mutagenesis. Last, we inspected the structures of LBDs from nonplant species and generated homology models for other GLR isoforms. Our results establish that GLR3.3 is a receptor endowed with a unique amino acid ligand profile and provide a structural framework for engineering this and other GLR isoforms to investigate their physiology.

PubMed: 31871183
DOI: 10.1073/pnas.1905142117

実験手法

X-RAY DIFFRACTION (2.5 Å)