Wang Qia, Smith Steven M, Huang Jinling
Key Laboratory for Plant Diversity and Biogeography of East Asia, Yunnan Key Laboratory for Fungal Diversity and Green Development, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China.
ARC Centre of Excellence for Plant Success in Nature and Agriculture, School of Natural Sciences, University of Tasmania, Hobart 7001, Australia.
Trends Plant Sci. 2022 May;27(5):450-459. doi: 10.1016/j.tplants.2021.11.009. Epub 2021 Dec 4.
Strigolactones (SLs) and karrikins (KARs) are butenolides that influence multiple aspects of plant growth and development. D14 and KAI2 are members of the α/β-fold hydrolase superfamily and act as receptors of SLs and KARs, as well as of unidentified endogenous KAI2-ligands (KLs). Phylogenetic analyses suggest that plant KAI2 was derived from bacterial RsbQ via horizontal gene transfer (HGT) before the emergence of streptophytes. The D14/KAI2 and RsbQ proteins share conserved tertiary structures and functional features. In this opinion article, we suggest that the acquisition of RsbQ by plant cells was fundamental to the formation of butenolide sensing systems. Recruitment of additional signal transduction components and gene duplication subsequently led to versatile butenolide signaling systems throughout land plants.
独脚金内酯（SLs）和卡里金（KARs）是对植物生长发育多个方面有影响的丁烯内酯。D14和KAI2是α/β折叠水解酶超家族的成员，作为SLs、KARs以及未鉴定的内源性KAI2配体（KLs）的受体。系统发育分析表明，在链形植物出现之前，植物KAI2通过水平基因转移（HGT）从细菌RsbQ衍生而来。D14/KAI2和RsbQ蛋白具有保守的三级结构和功能特征。在这篇观点文章中，我们认为植物细胞对RsbQ的获得是丁烯内酯传感系统形成的基础。随后，额外信号转导成分的招募和基因复制导致了整个陆地植物中多功能的丁烯内酯信号系统。
