拟南芥
液泡
细胞生物学
液泡蛋白分选
拟南芥
高尔基体
排序nexin
转运蛋白
化学
信号转导衔接蛋白
泛素
生物
内体
生物化学
突变体
基因
细胞质
磷酸化
内质网
细胞内
作者
Akira Yoshinari,Yutaro Shimizu,Takuya Hosokawa,Akihiko Nakano,Tomohiro Uemura,Junpei Takano
出处
期刊:Plant and Cell Physiology
[Oxford University Press]
日期:2024-08-31
摘要
Abstract Plants maintain nutrient homeostasis by controlling the activities and abundance of nutrient transporters. In Arabidopsis thaliana, the borate (B) transporter BOR1 plays a role in the efficient translocation of B under low-B conditions. BOR1 undergoes polyubiquitination in the presence of sufficient B and is then transported to the vacuole via multivesicular bodies (MVBs) to prevent B accumulation in tissues at a toxic level. A previous study indicated that BOR1 physically interacts with µ subunits of adaptor protein complexes AP-3 and AP-4, both involved in vacuolar sorting pathways. In this study, we investigated the roles of AP-3 and AP-4 subunits in BOR1 trafficking in Arabidopsis. The lack of AP-3 subunits did not affect either vacuolar sorting or polar localization of BOR1-GFP, whereas the absence of AP-4 subunits resulted in a delay in high-B-induced vacuolar sorting without affecting polar localization. Super-resolution microscopy revealed a rapid sorting of BOR1-GFP into AP-4-positive spots in the trans-Golgi network (TGN) upon high-B supply. These results indicate that AP-4 is involved in sequestration of ubiquitinated BOR1 into a TGN-specific subdomain “vacuolar-trafficking zone,” and is required for efficient sorting to MVB and vacuole. Our findings elucidate the rapid vacuolar sorting process facilitated by AP-4 in plant nutrient transporters.
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