Bürger Marco, Peterson Danica, Chory Joanne
Plant Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
Howard Hughes Medical Institute, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
iScience. 2024 Nov 28;27(12):111491. doi: 10.1016/j.isci.2024.111491. eCollection 2024 Dec 20.
Strigolactones serve as germination signals for several root-parasitic plant species within the Orobanchaceae family. Yet, their role in the life cycle of the facultatively parasitic genus has remained elusive. Here, we demonstrate that strigolactones initiate the formation of haustorium-like structures in . We present the genome of , which reveals an abundance of KAI2d paralogs that act as strigolactone receptors. 's KAI2d proteins include high-turnover enzymes, in particular KAI2d15, which features a substrate binding pocket with a methionine cluster at its entrance that is involved in the trade-off between substrate turnover and affinity. Our findings provide insights into strigolactone perception in and refine our perspective on their role in facultative parasitism.
独脚金内酯是列当科几种根寄生植物物种的萌发信号。然而，它们在兼性寄生属生命周期中的作用仍不清楚。在这里，我们证明独脚金内酯会引发该属中类吸器结构的形成。我们展示了该属的基因组，其揭示了大量作为独脚金内酯受体的KAI2d旁系同源物。该属的KAI2d蛋白包括高周转率的酶，特别是KAI2d15，其具有一个底物结合口袋，在其入口处有一个甲硫氨酸簇，参与底物周转率和亲和力之间的权衡。我们的研究结果为该属中独脚金内酯的感知提供了见解，并完善了我们对它们在兼性寄生中作用的看法。
