Regulation of Hedgehog Signaling pathway by BtbVII, the Potential Substrate-Recognizing adaptor of Cullin3-based Ubiquitin ligases
碩士 === 國立臺灣大學 === 分子醫學研究所 === 94 === The specificity of ubiquitination as well as the subsequent protein degradation is controlled by the substrate-specific adaptors that recruit substrates to the core ubiquitin ligase (E3) complexes. In Drosophila, it is known that the Hedgehog (Hh) pathway effecto...
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ndltd-TW-094NTU055380112015-12-16T04:38:21Z http://ndltd.ncl.edu.tw/handle/07488904185989739435 Regulation of Hedgehog Signaling pathway by BtbVII, the Potential Substrate-Recognizing adaptor of Cullin3-based Ubiquitin ligases 研究泛素黏合酶Cullin3的受質接受子BtbVII對Hedgehog訊息傳遞之調控 Hsin Chen 陳昕 碩士 國立臺灣大學 分子醫學研究所 94 The specificity of ubiquitination as well as the subsequent protein degradation is controlled by the substrate-specific adaptors that recruit substrates to the core ubiquitin ligase (E3) complexes. In Drosophila, it is known that the Hedgehog (Hh) pathway effector, Cubitus interruptus (Ci), is targeted by the adaptor protein Roadkill (Rdx) to Cullin3 (Cul3)-based E3 for ubiquitination. However, the existence of additional adaptor proteins is suggested by the less extent of Ci accumulation in the rdx mutant cells compared to that of Cul3 mutants. Besides, the Ci subcellular localization change in the Cul3 mutant cells implies that Cul3 regulates Hh pathway in multiple aspects. Here, I identified a potential adaptor protein, BtbVII, which binds Cul3 in vitro and in vivo. In a yeast two-hybrid database PIMRider, BtbVII has been shown to interact with two Hh pathway components Ci and Costal2 (Cos2), which liberates Ci to the nucleus in response to high Hh signals. We have confirmed the binding of BtbVII to Cos2 by means of GST pull-down. Moreover, Cos2 and Ci protein levels are reduced in the BtbVII overexpressing cells. Hence BtbVII is likely the linker that recruits Cos2 to Cul3 for ubiquitination; it may explain the Cul3-mediated control of Ci nuclear translocation. Taken together, I demonstrate that BtbVII is a potential substrate-specific adaptor for Cul3-based ubiquitin ligases, and it may regulate Hh signaling pathway by targeting Cos2 and Ci for ubiquitination. 簡正鼎 2006 學位論文 ; thesis 34 en_US |
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碩士 === 國立臺灣大學 === 分子醫學研究所 === 94 === The specificity of ubiquitination as well as the subsequent protein degradation is controlled by the substrate-specific adaptors that recruit substrates to the core ubiquitin ligase (E3) complexes. In Drosophila, it is known that the Hedgehog (Hh) pathway effector, Cubitus interruptus (Ci), is targeted by the adaptor protein Roadkill (Rdx) to Cullin3 (Cul3)-based E3 for ubiquitination. However, the existence of additional adaptor proteins is suggested by the less extent of Ci accumulation in the rdx mutant cells compared to that of Cul3 mutants. Besides, the Ci subcellular localization change in the Cul3 mutant cells implies that Cul3 regulates Hh pathway in multiple aspects. Here, I identified a potential adaptor protein, BtbVII, which binds Cul3 in vitro and in vivo. In a yeast two-hybrid database PIMRider, BtbVII has been shown to interact with two Hh pathway components Ci and Costal2 (Cos2), which liberates Ci to the nucleus in response to high Hh signals. We have confirmed the binding of BtbVII to Cos2 by means of GST pull-down. Moreover, Cos2 and Ci protein levels are reduced in the BtbVII overexpressing cells. Hence BtbVII is likely the linker that recruits Cos2 to Cul3 for ubiquitination; it may explain the Cul3-mediated control of Ci nuclear translocation. Taken together, I demonstrate that BtbVII is a potential substrate-specific adaptor for Cul3-based ubiquitin ligases, and it may regulate Hh signaling pathway by targeting Cos2 and Ci for ubiquitination.
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簡正鼎 |
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簡正鼎 Hsin Chen 陳昕 |
author |
Hsin Chen 陳昕 |
spellingShingle |
Hsin Chen 陳昕 Regulation of Hedgehog Signaling pathway by BtbVII, the Potential Substrate-Recognizing adaptor of Cullin3-based Ubiquitin ligases |
author_sort |
Hsin Chen |
title |
Regulation of Hedgehog Signaling pathway by BtbVII, the Potential Substrate-Recognizing adaptor of Cullin3-based Ubiquitin ligases |
title_short |
Regulation of Hedgehog Signaling pathway by BtbVII, the Potential Substrate-Recognizing adaptor of Cullin3-based Ubiquitin ligases |
title_full |
Regulation of Hedgehog Signaling pathway by BtbVII, the Potential Substrate-Recognizing adaptor of Cullin3-based Ubiquitin ligases |
title_fullStr |
Regulation of Hedgehog Signaling pathway by BtbVII, the Potential Substrate-Recognizing adaptor of Cullin3-based Ubiquitin ligases |
title_full_unstemmed |
Regulation of Hedgehog Signaling pathway by BtbVII, the Potential Substrate-Recognizing adaptor of Cullin3-based Ubiquitin ligases |
title_sort |
regulation of hedgehog signaling pathway by btbvii, the potential substrate-recognizing adaptor of cullin3-based ubiquitin ligases |
publishDate |
2006 |
url |
http://ndltd.ncl.edu.tw/handle/07488904185989739435 |
work_keys_str_mv |
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