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Two maize homologs of mammalian proton-coupled folate transporter, ZmMFS_1-62 and ZmMFS_1-73, are essential to salt and drought tolerance

文献类型： 外文期刊

作者： Hou, Xiaowan 1 ; Lu, Zhiwei 2 ; Yu, Taifei 4 ; Zhang, Yuanyuan 1 ; Yao, Quansheng 2 ; Zhang, Chunyi 1 ; Niu, Yiding 3 ; Liang, Qiuju 1 ;

作者机构： 1.Chinese Acad Agr Sci, Biotechnol Res Inst, Beijing 100081, Peoples R China

2.Chinese Acad Trop Agr Sci, South Subtrop Crops Res Inst, Key Lab Hainan Prov Postharvest Physiol & Technol, Zhanjiang, Peoples R China

3.Inner Mongolia Univ, Sch Life Sci, Key Lab Forage & Endem Crop Biotechnol, Minist Educ, Hohhot, Peoples R China

4.Changsha Med Univ, Hunan Pro Key Lab Res & Dev Novel Pharmaceut Prepa, Double First Class Applicat Characterist Disciplin, Changsha 410219, Peoples R China

5.Chinese Acad Agr Sci, Natl Nanfan Res Inst, Sanya 572000, Peoples R China

关键词： PCFT protein; Folates; Stress tolerance; Protein interaction; Zea mays L

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：6.5； 五年影响因子：6.4 ）

ISSN： 0981-9428

年卷期： 2024 年 210 卷

页码：

收录情况： SCI

摘要： Folates are essential to the maintenance of normal life activities in almost all organisms. Proton-coupled folate transporter (PCFT), belonging to the major facilitator superfamily, is one of the three major folate transporter types widely studied in mammals. However, information about plant PCFTs is limited. Here, a genome-wide identification of maize PCFTs was performed, and two PCFTs, ZmMFS_1-62 and ZmMFS_1-73, were functionally investigated. Both proteins contained the typical 12 transmembrane helixes with N- and C-termini located in the cytoplasm, and were localized in the plasma membrane. Molecular docking analysis indicated their binding activity with folates via hydrogen bonding. Interference with ZmMFS_1-62 and ZmMFS_1-73 in maize seedlings through virus-induced gene silencing disrupted folate homeostasis, mainly in the roots, and reduced tolerance to drought and salt stresses. Moreover, a molecular chaperone protein, ZmHSP20, was found to interact with ZmMFS_1-62 and ZmMFS_1-73, and interference with ZmHSP20 in maize seedlings also led to folate disruption and increased sensitivity to drought and salt stresses. Overall, this is the first report of functional identification of maize PCFTs, which play essential roles in salt and drought stress tolerance, thereby linking folate metabolism with abiotic stress responses in maize.

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