ZmnMAT1, a nuclear-encoded type I maturase, is required for the splicing of mitochondrial Nad1 intron 1 and Nad4 intron 2

文献类型： 外文期刊

第一作者： Fan, Kaijian

作者： Fan, Kaijian;Fu, Qinghui;Liu, Yan;Ren, Zhenjing;Liu, Yunjun;Wei, Qianhan;Zhao, Anqi;Jia, Sinian;Wang, Tengteng;Cao, Jie

作者机构：

关键词： ZmnMAT1; group II intron splicing; type I maturase; mitochondrion; seed development; maize

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 13 卷

页码：

收录情况： SCI

摘要： Maturases can specifically bind to intron-containing pre-RNAs, folding them into catalytic structures that facilitate intron splicing in vivo. Plants possess four nuclear-encoded maturase-related factors (nMAT1-nMAT4) and some maturases have been shown to involve in the splicing of different mitochondrial group II introns; however, the specific biological functions of maturases in maize are largely uncharacterized. In this study, we identified a maize ZmnMAT1 gene, which encodes a mitochondrion-localized type I maturase with an RT domain at N-terminus and an X domain at C-terminus. Loss-of-function mutation in ZmnMAT1 significantly reduced the splicing efficiencies of Nad1 intron 1 and Nad4 intron 2, and showed arrested embryogenesis and endosperm development, which may be related to impaired mitochondrial ultrastructure and function due to the destruction of the assembly and activity of complex I. Direct physical interaction was undetectable between ZmnMAT1 and the proteins associated with the splicing of Nad1 intron 1 and/or Nad4 intron 2 by yeast two-hybrid assays, suggesting the complexity of group II intron splicing in plants.

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