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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
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胺 (维生素B1) 的 thiazole 酸盐部分的生物合成:由 thiazole 合成酶催化的早期步骤.

Pieter C Dorrestein1, Huili Zhai, Sean V Taylor

  • 1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.

Journal of the American Chemical Society
|March 12, 2004
PubMed
概括

醇合成酶 (ThiG) 促进了胺酸盐生物合成中的关键重组. 一个新的机制揭示了Bacillus subtilis中一种imine中间体和硫载体蛋白的参与.

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科学领域:

  • 生物化学 生物化学
  • 酶学 是一种酶学.
  • 微生物的新陈代谢

背景情况:

  • 胺酸 (TPP) 是许多代谢酶的必不可少的辅因子.
  • 太酸部分的生物合成TPP是复杂的,并没有完全阐明.
  • 醇合成酶 (ThiG) 是该途径中的一个关键酶,催化了1-脱氧-d-硫-5-酸盐 (DXP) 的重新排列.

研究的目的:

  • 阐明 thiazole 合成酶 (ThiG) 在胺酸盐的 thiazole 酸盐部分的生物合成中的机制.
  • 为了识别在ThiG催化反应中形成的中间体.
  • 提出修订的生物化学途径,用于提亚环的形成.

主要方法:

  • 使用1-deoxy-d-xylulose-5-phosphate (DXP) 的酶催化交换反应.
  • 酶结合的伊米因中间体的化降解.
  • 从上到下进行质谱分析,以定位 imine.
  • 基于实验证据的生物化学途径重建.

主要成果:

  • 证明了DXP的C2碳基的酶催化交换,支持imine的形成.
  • 通过化物还原和质谱测量定位了DXP imine中间体到ThiG的lysine 96.
  • 提出了一种新的机制,涉及阿马多里类型的重新排列,产生C3中间体.

结论:

  • 拟议的机制涉及到阿马多里型的imine中间体的重新排列.
  • 在DXP的C3处产生一个,然后被硫载体蛋白 (ThiS-thiocarboxylate) 攻击.
  • 这为Bacillus subtilis. thiazole环生物合成提供了详细的机制洞察.