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Globular and Fibrous Proteins

Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
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Cytochrome P450 (CYP450) enzymes are a superfamily of heme-containing monooxygenases that play a pivotal role in Phase I drug metabolism by catalyzing oxidation and reduction reactions.These enzymes transform lipophilic xenobiotics into more hydrophilic metabolites, facilitating subsequent Phase II conjugation and eventual excretion. The CYP450 family is classified into families (e.g., CYP1–CYP3) and subfamilies (e.g., CYP2A, CYP2C), based on amino acid sequence homology.CYP450 isoenzymes,...

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相关实验视频

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Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology
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在细胞染色体P450中存在基本ferryls的证据.

Rachel K Behan1, Lee M Hoffart, Kari L Stone

  • 1Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Journal of the American Chemical Society
|August 31, 2006
PubMed
概括

P450酶的铁形式在生理 pH 时被质子化. 这一发现得到了Mössbauer光谱学和密度函数计算的支持,澄清了heme活性部位化学.

科学领域:

  • 生物化学 生物化学
  • 计算化学计算化学
  • 频谱学是一种光谱学.

背景情况:

  • 细胞染色体P450酶对于生物氧化反应至关重要.
  • P450酶的活性状态,铁物种,在催化过程中起着关键作用.
  • 了解ferryl物种的质子化状态对于阐明酶机制至关重要.

研究的目的:

  • 在生理pH值下确定P450(BM3) 和P450cam的费里尔形式的质子化状态.
  • 为了研究质子化对铁物种的莫斯巴乌尔参数的影响.
  • 为了解P450酶中的血红素活性位点的电子结构提供见解.

主要方法:

  • 使用Mössbauer光谱法来实验性地测量ferryl物种的参数.
  • 密度函数计算在大型活动场地模型上进行.
  • 理论的Mössbauer参数是计算出两个质子和无质子铁物种.

主要成果:

  • 计算显示,在铁单元的质子化后,四极分裂参数显著增加.
  • 对P450(BM3) 和P450cam的实验四极分裂值与对质子化费里尔形式的计算值非常相匹配.
  • 确定P450(BM3) 和P450cam的费里尔形式在生理pH下被质子化.

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结论:

  • 在生理条件下,P450(BM3) 和P450cam的费里尔形式被质子化.
  • 铁单元的质子化导致四极分裂参数的明显扩大.
  • 这些发现表明,质子化铁是P450酶中酸结合的常见特征.