揭示了催化氧环素生物合成的最后步骤的酶
Peng Wang1, Ghader Bashiri, Xue Gao
1Department of Chemical and Biomolecular Engineering, University of California Los Angeles, Los Angeles, California 90095, USA.
Journal of the American Chemical Society
|April 30, 2013
概括
两种新的氧化还原酶,OxyS和OxyR,通过催化关键的氧化和还原步骤,完成了氧化四环素的生物合成. 这项研究阐明了生产这种重要的广谱抗生素的最终酶途径.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 自然产品生物合成 自然产品生物合成
背景情况:
- 环素是重要的宽谱抗生素,由四环支架定义.
- 已知氧基环素前体无水环素的生物合成,但后来的步骤仍然没有特征.
- 了解完整的生物合成途径对于抗生素的生产和发现至关重要.
研究的目的:
- 为了识别和表征负责oxytetracycline生物合成的最后步骤的酶.
- 阐明氧化和还原的酶机制,将无水甲环素转化为氧甲环素.
- 为了获得有关关键酶的结构洞察力.
主要方法:
- 使用纯化重组酶OxyS和OxyR的酶分析.
- 化和还原活动的表征.
- 减少步骤的辅因子识别 (F420)
- 氧化酶 (OxyS) 的X射线晶体学.
主要成果:
- 两种氧化还原酶,OxyS和OxyR被确定为足以将无水甲环素转化为氧化甲环素.
- OxyS在C6和C5进行了连续的化,具有不同的立体化学.
- 使用F420辅因子,OxyR催化了C5a-C11a的减少.
- OxyS 的晶体结构揭示了合氧化过程的细节.
- 酶基质的特异性会影响氧化四环素和四环素的比例.
结论:
- 氧基环生物合成的酶途径现在已经完成了OxyS和OxyR的表征.
- OxyS和OxyR是氧化解氧化酶的关键酶,对于氧化环生产至关重要.
- 对OxyS的结构和机制洞察力有助于我们更好地了解四环素生物合成和酶功能的理解.
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