Ribosome 18S m6A Methyltransferase METTL5 Promotes Translation Initiation and Breast Cancer Cell Growth.
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| Abstract |
N6 methylation at adenosine 1832 (m6A1832) of mammalian 18S rRNA, occupying a critical position within the decoding center, is modified by a conserved methyltransferase, METTL5. Here, we find that METTL5 shows strong substrate preference toward the 18S A1832 motif but not the other reported m6A motifs. Comparison with a yeast ribosome structural model unmodified at this site indicates that the modification may facilitate mRNA binding by inducing conformation changes in the mammalian ribosomal decoding center. METTL5 promotes p70-S6K activation and proper translation initiation, and the loss of METTL5 significantly reduces the abundance of polysome. METTL5 expression is elevated in breast cancer patient samples and is required for growth of several breast cancer cell lines. We further find that Caenorhabditis elegans lacking the homolog metl-5 develop phenotypes known to be associated with impaired translation. Altogether, our findings uncover critical and conserved roles of METTL5 in the regulation of translation.
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| Authors | Bowen Rong, Qian Zhang, Jinkai Wan, Shenghui Xing, Ruofei Dai, Yuan Li, Jiabin Cai, Jiaying Xie, Yang Song, Jiawei Chen, Lei Zhang, Guoquan Yan, Wen Zhang, Hai Gao, Jing-Dong J Han, Qianhui Qu, Honghui Ma, Ye Tian, Fei Lan |
| Journal | Cell reports (Cell Rep) Vol. 33 Issue 12 Pg. 108544 (12 22 2020) ISSN: 2211-1247 [Electronic] United States |
| PMID | 33357433 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
| Copyright | Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved. |
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