通过前体指导生物合成,在里法米生物合成途径中对中间体进行立体化学分配
Ingo V Hartung1, Mathew A Rude, Nathan A Schnarr
1Department of Chemistry, Stanford University, Stanford, California 94305-5025, USA.
Journal of the American Chemical Society
|August 11, 2005
概括
研究人员通过合成关键生物合成中间体来解码里法米辛B前体的立体化学. 本研究确定了 rifamycin 合成原生生物合成中间体的绝对和相对配置.
科学领域:
- 生物化学 生物化学
- 有机化学 有机化学
- 分子生物学分子生物学
背景情况:
- 里法米辛是抑制细菌RNA聚合酶的关键抗生素.
- 利法素B的生物合成途径涉及多基化合成酶模块.
- 早期聚基酸中间体的立体化学被芳香化所掩盖.
研究的目的:
- 为了确定里法米B生物合成前体的绝对和相对配置.
- 阐明了 rifamycin 生物合成中第一个多基酸合成模块的立体化学结果.
主要方法:
- 合成所有四个N-乙半胺 (SNAC) 铁前体的二聚体,用于利法胺合成酶模块 2.
- 在体内循环检测试验以确定正确配置的基质.
主要成果:
- 只有一个合成的二聚体在体内有效地转化为利法B.
- 这证实了生物合成途径所需的特定立体化学配置.
结论:
- 已经确定了里法米B原生生物合成中间体的绝对和相对配置.
- 这项工作澄清了临床重要里法胺素复杂生物合成的关键步骤.
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