報告時間:2019年10月15日(星期二)👨🏼🎨,09🚿:30-11👨🏿⚕️🎅🏿:30
報告地點:閔行校區EON体育4平台 樹華多功能廳
聯系人:林雙君
報告人:Hung-wen Liu (Division of Chemical Biology & Medicinal Chemistry, College of Pharmacy, and Department of Chemistry, University of Texas at Austin)
Abstract:
Scopolamine is a tropane alkaloid found in the Solanaceae family of plants. It has antagonistic activity against muscarinic acetylcholine receptors. The construction of the epoxide ring in scopolamine is of great interest, because it is formed by oxidation of two unactivated methylene groups of hyoscyamine, the precursor to scopolamine. The epoxidation is catalyzed by hyoscyamine 6β-hydroxylase (H6H) which is a mononuclear non-heme iron- and α-ketoglutarate-dependent dioxygenase. The overall transformation involves a two-step oxidation of hyoscyamine: hydroxylation of an aliphatic carbon followed by dehydrogenation of the resulting secondary alcohol. A high-valent iron(IV)-oxo species generated via activation of molecular oxygen is believed to be involved in both steps. However, the detailed mechanism regarding how H6H controls these two sequential oxidation reactions remains unclear. To address these mechanistic questions, experiments were carried to gain more insights into the catalysis of H6H. The results of these experiments will be presented and discussed.
報告人簡介🏕:
劉鴻文教授,1981年在哥倫比亞大學獲博士學位👳🏻♀️,師從Koji Nakanishi教授;1981-1984在麻省理工大學Christopher T. Walsh教授實驗室從事博士後研究。1984-2000年任職於明尼蘇達大學化學系,獲傑出教授稱號。2001年至今任職於德克薩斯大學奧斯汀分校藥EON4及化學和生物化學系,George H. Hitchings藥物設計講座教授。現為美國科學促進會和日本科學促進會Fellow🩵,美國微生物科EON4Fellow🐮,美國化學學會Fellow。劉鴻文教授實驗室聚焦在化學和生物學的交叉領域,重點關註生物催化機製與藥物設計🤌🏻、代謝途徑工程🎅🏻、生物催化劑應用等🆕🤱🏽,長期致力於利用有機化學和生物催化工具研究抗生素的合成機理🦜,取得了令人矚目的研究成果,並因此先後獲得過多項學術獎勵,如Camille & Henry Dreyfus基金會傑出化學新進教授獎、美國癌症學會青年教授獎😹、Eli Lilly生命科學青年學者獎💅、美國衛生福利部研究發展獎、美國化學會糖化學部Horace S. Isbell獎(1993)、美國國家基礎醫學研究院傑出研究獎🤸🏿♀️🫣、美國化學會有機化學部Nakanishi獎(2007)、美國化學會生物化學部Repligen獎(2008)🍕,生物化學研究A. I. Scott傑出勛章(2011)🤸♂️,美國化學會Arthur C. Cope Late Career Scholars Award(2014),美國化學會糖化學部Claude S. Hudson Award (2019)等二十多項。劉鴻文教授擔任ACS期刊Organic Letters的副主編,及多種生物有機化學和化學學術期刊的編委會成員👨🏽🍳,至今發表了280篇論文🚵🏻♂️,其中超過1/3發表在Nature、Science、PNAS、J. Am. Chem. Soc.和Angew. Chem. Int. Ed.等期刊上。