【摘 要】
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Apart from their primordial role in protein synthesis,tRNAs can be cleaved to produce tRNA-derived small RNAs (tsRNAs).The biological functions of tsRNAs in plants remain largely unknown.In this study,we developed RtcB ligation-based small RNA (sRNA) sequ
【机 构】
：
Center for Plant Biology,School of Life Sciences,Tsinghua University,Beijing 100084,China;Tsinghua U
论文部分内容阅读
Apart from their primordial role in protein synthesis,tRNAs can be cleaved to produce tRNA-derived small RNAs (tsRNAs).The biological functions of tsRNAs in plants remain largely unknown.In this study,we developed RtcB ligation-based small RNA (sRNA) sequencing,a method that captures and distinguishes between 3\'-2\',3\'-cyclic-phosphate (cP)/phosphate (P)-terminated sRNAs and 3\'-OH-terminated sRNAs,and profiled 5\'tsRNAs and 5\'tRNA halves in Arabidopsis thaliana.We found that Arabidopsis 5\'tsRNAs and 5\'tRNA halves predominantly contain a cP at the 3\'end and require S-like RNase 1 (RNS1) and RNS3 for their production.One of the most abundant 5\'tsRNAs,5\'tsR-Ala,by associating with AGO1,negatively regulates Cytochrome P45071A13 (CYP71A13) expression and camalexin biosynthesis to repress anti-fungal defense.Interestingly,5\'tsR-Ala is downregulated upon fungal infection.Our study provides a global view of 5\'tsRNAs and 5\'tRNA halves in Arabidopsis and unravels an important role of a 5\'tsRNA in regulating anti-fungal defense.
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