通过含有的甲脱酶减少二氧化碳:动力学和机械学研究
Luisa B Maia1, Luis Fonseca1, Isabel Moura1
1UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa , 2829-516 Caparica, Portugal.
Journal of the American Chemical Society
|June 28, 2016
概括
脱硫维脱硫酸盐形成脱酶 (Dd FDH) 可以激活并有效地将二氧化碳转化为燃料. 这种酶
科学领域:
- 生物催化和酶机制
- 环境化学与可持续性
背景情况:
- 碳二氧化物 (CO2) 积累给生态带来风险,但它的低成本和丰富性使其成为一种有价值的原料.
- CO2分子的稳定性对其化学激活和利用提出了挑战.
- 以自然为灵感的催化策略是开发高效的二氧化碳转化生物催化剂的关键.
研究的目的:
- 在动力学和机械学上描述Desulfovibrio desulfuricans形成脱酶 (Dd FDH) 的二氧化碳减少活性.
- 调查Dd FDH的激活机制和催化可逆性.
- 提出一种用于酸盐氧化和二氧化碳减排的新反应机制.
主要方法:
- 对Dd FDH催化反应的动态表征.
- 涉及酶激活和抑制的机制研究.
- 对歇斯底里酶行为的动态模型的开发.
- 对中心的光谱分析.
主要成果:
- Dd FDH 需要降解依赖的激活过程,表现出歇斯底里.
- 激活的Dd FDH有效催化甲酸盐氧化 (kcat = 543 s-1,Km = 57.1 μM) 和二氧化碳减排 (kcat = 46.6 s-1,Km = 15.7 μM).
- 这两种反应都是可逆的,并且被化物抑制.
- 提出了一种涉及化物转移和-硫相互作用的新机制.
结论:
- Dd FDH是可逆利用二氧化碳的有希望的生物催化剂.
- 理解酶激活和反应机制可以指导新型二氧化碳转化催化剂的设计.
- 拟议的机制强调了硫基在化物转移中的作用.
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