细菌菌THI4p是一种自杀性硫胺 thiazole 合成酶
Abhishek Chatterjee1, N Dinuka Abeydeera, Shridhar Bale
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
Nature
|October 28, 2011
概括
胺酸盐 (TPP) 对于生命至关重要. 研究人员研究了真核酶THI4p,揭示了其单次转换,自杀机制,涉及TPP thiazole生物合成中的铁依赖硫化物转移.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 酶学 是一种酶学.
背景情况:
- 胺酸 (TPP) 是所有生物体中众多代谢酶的必不可少的辅因子.
- TPP生物合成需要分开合成和随后合胺和 thiazole 前体.
- 虽然 prokaryotic thiazole 生物合成涉及多个酶和复杂的氧化凝聚,但真核细胞路径使用单个基因产物,THI4p.
研究的目的:
- 描述真核生物胺 thiazole 生物合成酶的酶活性和机制,THI4p.
- 阐明铁和硫化物转移在THI4p催化反应中的作用.
- 为了确定再组合THI4p的催化效率和营业额.
主要方法:
- 完全活跃的复合野生型THI4p的表达和净化.
- 生物化学测定用于监测酶活性和反应中间体.
- 使用光谱和化学方法识别铁依赖和硫化物转移.
主要成果:
- 重组THI4p是在完全活性形式中制备的.
- 确定了一种依赖于铁的硫化物转移反应,从保存的氨酸残留物转移到反应中间体.
- 证明THI4p是一种自杀酶,只经历一次循环.
结论:
- 通过THI4p进行的真核胺 thiazole 生物合成通过一种独特的机制进行,涉及铁依赖的硫化物转移.
- THI4p 作为一个单一循环的自杀酶,与 prokaryotic 途径相比,突出了独特的催化策略.
- 这些发现为真核生物体中必需辅因子生物合成的分子机制提供了关键的见解.
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