Structural and functional analyses explain Pea KAI2 receptor diversity and reveal stereoselective catalysis during signal perception.
Structural and functional analyses explain Pea KAI2 receptor diversity and reveal stereoselective catalysis during signal perception.
复制标题
结构和功能分析解释了 Pea KAI2 受体的多样性,并揭示了信号感知过程中的立体选择性催化作用。
DOI:
10.1038/s42003-022-03085-6
复制
发表时间:
2022-02-11
影响因子:
5.9
通讯作者:
Shabek N
中科院分区:
文献类型:
--
作者:
Guercio AM;Torabi S;Cornu D;Dalmais M;Bendahmane A;Le Signor C;Pillot JP;Le Bris P;Boyer FD;Rameau C;Gutjahr C;de Saint Germain A;Shabek N
KAI2 proteins are plant α/β hydrolase receptors which perceive smoke-derived butenolide signals and endogenous, yet unidentified KAI2-ligands (KLs). The number of functional KAI2 receptors varies among species and KAI2 gene duplication and sub-functionalization likely plays an adaptative role by altering specificity towards different KLs. Legumes represent one of the largest families of flowering plants and contain many agronomic crops. Prior to their diversification, KAI2 underwent duplication resulting in KAI2A and KAI2B. Here we demonstrate that Pisum sativum KAI2A and KAI2B are active receptors and enzymes with divergent ligand stereoselectivity. KAI2B has a higher affinity for and hydrolyses a broader range of substrates including strigolactone-like stereoisomers. We determine the crystal structures of PsKAI2B in apo and butenolide-bound states. The biochemical, structural, and mass spectra analyses of KAI2s reveal a transient intermediate on the catalytic serine and a stable adduct on the catalytic histidine, confirming its role as a bona fide enzyme. Our work uncovers the stereoselectivity of ligand perception and catalysis by diverged KAI2 receptors and proposes adaptive sensitivity to KAR/KL and strigolactones by KAI2B. Guercio et al., combine structural biology, biochemistry, and plant biology to reveal the dual functions of evolutionarily diverged Pisum KAI2A and KAI2B as both receptors and enzymes with distinct ligand selectivity, and propose adaptive sensitivity to strigolactone phytohormones by KAI2B. They reported the structures of KAI2 in apo and ligand intermediate -bound states that further illuminate KAI2s catalysis mechanism.
登录
查看更多内容
影响因子:
8.8
作者:
Burger, Marco;Mashiguchi, Kiyoshi;Chory, Joanne
通讯作者:
Chory, Joanne
DOI:
10.1107/s0907444909052925
发表时间:
2010-02
期刊:
Acta crystallographica. Section D, Biological crystallography
影响因子:
--
作者:
Adams PD;Afonine PV;Bunkóczi G;Chen VB;Davis IW;Echols N;Headd JJ;Hung LW;Kapral GJ;Grosse-Kunstleve RW;McCoy AJ;Moriarty NW;Oeffner R;Read RJ;Richardson DC;Richardson JS;Terwilliger TC;Zwart PH
通讯作者:
Zwart PH
影响因子:
7.2
作者:
Clough, SJ;Bent, AF
通讯作者:
Bent, AF
影响因子:
3.7
作者:
Bythell-Douglas R;Waters MT;Scaffidi A;Flematti GR;Smith SM;Bond CS
通讯作者:
Bond CS
影响因子:
64.8
作者:
Gomez-Roldan, Victoria;Fermas, Soraya;Rochange, Soizic F.
通讯作者:
Rochange, Soizic F.