文献类型： 外文期刊
第一作者： Liu, Xiao-Juan
作者： Liu, Xiao-Juan;Liu, Xin;Zhao, Qiang;Dong, Yuan-Hua;Yao, Yu-Xin;You, Chun-Xiang;Kang, Hui;Wang, Xiao-Fei;Liu, Xiao-Juan;Xue, Yuan;Liu, Xin;Zhao, Qiang;Liu, Qiangbo
作者机构：
期刊名称：HORTICULTURE RESEARCH （ 影响因子：7.6； 五年影响因子：8.2 ）
ISSN： 2662-6810
年卷期： 2024 年 11 卷 5 期
页码：
收录情况： SCI
摘要： BTB and TAZ domain proteins (BTs) function as specialized adaptors facilitating substrate recognition of the CUL3-RING ubiquitin ligase (CRL3) complex that targets proteins for ubiquitination in reaction to diverse pressures. Nonetheless, knowledge of the molecular mechanisms by which the apple scaffold protein MdBT2 responds to external and internal signals is limited. Here we demonstrate that a putative Ca 2+ sensor, calmodulin-like 15 (MdCML15), acts as an upstream regulator of MdBT2 to negatively modulate its functions in plasma membrane H+-ATPase regulation and iron deficiency tolerance. MdCML15 was identified to be substantially linked to MdBT2, and to result in the ubiquitination and degradation of the MdBT2 target protein MdbHLH104. Consequently, MdCML15 repressed the MdbHLH104 target, MdAHA8's expression, reducing levels of a specific membrane H+-ATPase. Finally, the phenotype of transgenic apple plantlets and calli demonstrated that MdCML15 modulates membrane H+-ATPase-produced rhizosphere pH lowering alongside iron homeostasis through an MdCML15-MdBT2-MdbHLH104-MdAHA8 pathway. Our results provide new insights into the relationship between Ca2+ signaling and iron homeostasis.
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