生物
精子
细胞生物学
脂质双层融合
卵细胞
融合蛋白
拟南芥
遗传学
进化生物学
基因
膜
突变体
重组DNA
作者
Wei Wang,Hanxian Xiong,Peng Zhao,Xiongbo Peng,Meng-Xiang Sun
标识
DOI:10.1073/pnas.2207608119
摘要
Sexual reproduction involves the fusion of two gametes of opposite sex. Although the sperm-expressed fusogen HAPLESS 2 (HAP2) or GENERATIVE CELL SPECIFIC 1 (GCS1) plays a vital role in this process in many eukaryotic organisms and an understanding of its regulation is emerging in unicellular systems [J. Zhang et al. , Nat. Commun. 12, 4380 (2021); J. F. Pinello et al. Dev. Cell 56, 3380–3392.e9 (2021)], neither HAP2/GCS1 interactors nor mechanisms for delivery and activation at the fusion site are known in multicellular plants. Here, we show that Arabidopsis thaliana HAP2/GCS1 interacts with two sperm DUF679 membrane proteins (DMP8 and DMP9), which are required for the EGG CELL 1 (EC1)-induced translocation of HAP2/GCS1 from internal storage vesicle to the sperm plasma membrane to ensure successful fertilization. Our studies in Arabidopsis and tobacco provide evidence for a conserved function of DMP8/9-like proteins as HAP2/GCS1 partner in seed plants. Our data suggest that seed plants evolved a DMP8/9-dependent fusogen translocation process to achieve timely acquisition of sperm fusion competence in response to egg cell–derived signals, revealing a previously unknown critical step for successful fertilization.
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