Evolutionary conservation of TORC1 components, TOR, Raptor, and LST8, between rice and yeast

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• 作者：Kentaro Maegawa ; Rumi Takii ; Takashi Ushimaru…
• 关键词：Target of rapamycin ; Raptor ; LST8 ; Rice ; Saccharomyces cerevisiae ; TORC1
• 刊名：Molecular Genetics and Genomics
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：290
• 期：5
• 页码：2019-2030
• 全文大小：2,240 KB
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• 作者单位：Kentaro Maegawa (1)
  Rumi Takii (1)
  Takashi Ushimaru (1)
  Akiko Kozaki (1)
  
  1. Department of Biology, Shizuoka University, 836 Ohya Suruga-ku, Shizuoka, 422-8529, Japan
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Cell Biology
  Biochemistry
  Microbial Genetics and Genomics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1617-4623

文摘

Target of rapamycin (TOR) is a conserved eukaryotic serine/threonine kinase that functions as a central controller of cell growth. TOR protein is structurally defined by the presence several conserved domains such as the HEAT repeat, focal adhesion target (FAT), FKBP12/rapamycin binding (FRB), kinase, and FATC domains starting from the N-terminus. In most eukaryotes, TOR forms two distinct physical and functional complexes, which are termed as TOR complex 1 (TORC1) and TORC2. However, plants contain only TORC1 components, i.e., TOR, Raptor, and LST8. In this study, we analyzed the gene structure and functions of TORC components in rice to understand the properties of the TOR complex in plants. Comparison of the locations of introns in these genes among rice and other eukaryotes showed that they were well conserved among plants except for Chlamydomonas. Moreover, the intron positions in the coding sequence of human Raptor and LST8 were closer to those of plants than of fly or nematode. Complementation tests of rice TOR (OsTOR) components in yeast showed that although OsTOR did not complement yeast tor mutants, chimeric TOR, which consisted of the HEAT repeat and FAT domain from yeast and other regions from rice, rescued the tor mutants, indicating that the HEAT repeat and FAT domains are important for species-specific signaling. OsRaptor perfectly complemented a kog1 (yeast Raptor homolog) mutant, and OsLST8 partially complemented an lst8 mutant. Together, these data suggest the importance of the N-terminal region of the TOR, HEAT, and FAT domains for functional diversification of the TOR complex. Keywords Target of rapamycin Raptor LST8 Rice Saccharomyces cerevisiae TORC1