Studies on protein arginine methylation during K-562 differentiation induced by Ara-C
碩士 === 國立陽明大學 === 生物藥學研究所 === 90 === Post-translational modifications play pivotal roles in almost all cellular processes. In contrast to the large number of studies in protein phosphorylation, evidences for the functional roles of protein methylation are just now accumulating. Arginine m...
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ndltd-TW-090YM0006030132016-06-24T04:15:12Z http://ndltd.ncl.edu.tw/handle/61839179179663891017 Studies on protein arginine methylation during K-562 differentiation induced by Ara-C Ara-C刺激K-562細胞過程中蛋白質精胺酸甲基化之研究 Chih-Jen Kuan 官芝任 碩士 國立陽明大學 生物藥學研究所 90 Post-translational modifications play pivotal roles in almost all cellular processes. In contrast to the large number of studies in protein phosphorylation, evidences for the functional roles of protein methylation are just now accumulating. Arginine methylation has been recently implicated as a novel mechanism in cell growth control, gene expression regulation, signal transduction and protein intracellular localization. In this study, we examined whether protein methylation, with particular attention on arginine methylation, played a role in the differentiation of K-562 cells induced by Ara-C. Our results showed that methylation of selective endogenous protein substrates were modulated during differentiation and the methyltransferase activity torward hnRNP A2 was upregulated and reached its peak at 48-72hr after Ara-C treatment suggesting that differentiation of K562 into erythroid involved dynamic methylation/ demethylation of particular proteins. Methylation of hnRNP A2 and a number of the endogenous substrates was inhibited in the presence of the GR peptide (GGRGGRGRGGF) but not the GA peptide whose arginines were replaced by alanines. This indicated that the methyl groups were incorporated predominantly into arginine residues. AdOx, a potent inhibitor of methyltransferases, suppressed differentiation of K562 as measured by benzidine staining. Our results suggested a crucial role of protein arginine methylation in K562 differentiation into erythroid. We also showed that calcium, which has been shown to play roles in K562 differentiation, differentially modulated methylation of endogenous protein substrates in K562 cells suggesting that regulation of arginine methyltransferase activity during K562 differentiation may be mediated by calcium signaling. Wey-Jinq Lin 林蔚靖 2002 學位論文 ; thesis 78 zh-TW |
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碩士 === 國立陽明大學 === 生物藥學研究所 === 90 === Post-translational modifications play pivotal roles in almost all cellular processes. In contrast to the large number of studies in protein phosphorylation, evidences for the functional roles of protein methylation are just now accumulating. Arginine methylation has been recently implicated as a novel mechanism in cell growth control, gene expression regulation, signal transduction and protein intracellular localization. In this study, we examined whether protein methylation, with particular attention on arginine methylation, played a role in the differentiation of K-562 cells induced by Ara-C. Our results showed that methylation of selective endogenous protein substrates were modulated during differentiation and the methyltransferase activity torward hnRNP A2 was upregulated and reached its peak at 48-72hr after Ara-C treatment suggesting that differentiation of K562 into erythroid involved dynamic methylation/ demethylation of particular proteins. Methylation of hnRNP A2 and a number of the endogenous substrates was inhibited in the presence of the GR peptide (GGRGGRGRGGF) but not the GA peptide whose arginines were replaced by alanines. This indicated that the methyl groups were incorporated predominantly into arginine residues. AdOx, a potent inhibitor of methyltransferases, suppressed differentiation of K562 as measured by benzidine staining. Our results suggested a crucial role of protein arginine methylation in K562 differentiation into erythroid. We also showed that calcium, which has been shown to play roles in K562 differentiation, differentially modulated methylation of endogenous protein substrates in K562 cells suggesting that regulation of arginine methyltransferase activity during K562 differentiation may be mediated by calcium signaling.
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author2 |
Wey-Jinq Lin |
author_facet |
Wey-Jinq Lin Chih-Jen Kuan 官芝任 |
author |
Chih-Jen Kuan 官芝任 |
spellingShingle |
Chih-Jen Kuan 官芝任 Studies on protein arginine methylation during K-562 differentiation induced by Ara-C |
author_sort |
Chih-Jen Kuan |
title |
Studies on protein arginine methylation during K-562 differentiation induced by Ara-C |
title_short |
Studies on protein arginine methylation during K-562 differentiation induced by Ara-C |
title_full |
Studies on protein arginine methylation during K-562 differentiation induced by Ara-C |
title_fullStr |
Studies on protein arginine methylation during K-562 differentiation induced by Ara-C |
title_full_unstemmed |
Studies on protein arginine methylation during K-562 differentiation induced by Ara-C |
title_sort |
studies on protein arginine methylation during k-562 differentiation induced by ara-c |
publishDate |
2002 |
url |
http://ndltd.ncl.edu.tw/handle/61839179179663891017 |
work_keys_str_mv |
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