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Balancing Redox Equations02:58

Balancing Redox Equations

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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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重编程罗斯曼折叠签名图案可以创建正交的氧化生物催化剂.

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    此摘要是机器生成的。

    科学家们设计了新的酶,专门使用尼古丁胺胺单核酸 (NMN) 作为辅因子,克服了代谢工程现有的NAD (P) /H系统的局限性. 这一突破使得人们能够精确地控制细胞的减速功率.

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    科学领域:

    • 生物催化剂是一种生物催化剂.
    • 代谢工程是代谢工程.
    • 合成生物学 合成生物学

    背景情况:

    • 生物降解功率主要由尼古丁胺氨酸二核酸 (酸盐) (NAD(P) / H) 管理,这对将其引导到工程代谢途径提出了挑战.
    • 尼古丁胺胺 mononucleotide (NMN(H)) 提供一个正交的氧化还原因子溶液,但创建NMN(H) 特定的酶,避免细胞NAD(P) /H池仍然困难.
    • 之前的酶设计保留了罗斯曼折叠酶中保存的GxGxxG动机,无意中保持了NAD (P) /H识别.

    研究的目的:

    • 通过对罗斯曼折叠酶中保存的GxGxxG动机进行工程来开发NMN(H) 特定的酶.
    • 为了证明创建独立于细胞NAD (P) /H池的正交回氧生物催化剂的可行性.
    • 提高工程代谢途径的生物催化生产率和辅助因子特异性.

    主要方法:

    • 通过修改罗斯曼折叠酶中的GxGxxG动机来进行酶工程.
    • 对酸盐脱酶 (PTDH) 和糖-3-酸盐脱酶 (GapA) 的实施.
    • 利用罗塞塔模型,结构对齐和实验验证在整个细胞和细胞溶解物中.

    主要成果:

    • 工程 PTDH 变体 (NRC-01,NRC-02) 消除了辅因子"泄漏",并增加了依赖 NMN ((H) 的生物转化生产率约240倍.
    • 工程 GapA 变体 (RSQ) 在 NAD+ 到 NMN+ 的辅因子特异性中实现了 ~2.9x10^4 倍的切换.
    • 通过改变先前必不可少的GxGxxG动机,成功创建了活性NMN+特异性酶.

    结论:

    • 罗斯曼折叠酶中保存的GxGxxG动机是可变的,使NMN+特定酶的产生成为可能.
    • 罗斯曼折叠重编程与结构增强相结合,为开发正交氧化还原生物催化剂提供了一个总体策略.
    • 这种方法克服了NAD (P) /H依赖性的局限性,为先进的代谢工程应用铺平了道路.