Allosteric P450 mechanisms: multiple binding sites, multiple conformers or both?

Allosteric P450 mechanisms: multiple binding sites, multiple conformers or both?
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DOI:
10.1517/17425250802500028
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发表时间:
2008-12
影响因子:
4.3
通讯作者:
Halpert JR
Halpert JR
中科院分区:
医学2区
文献类型:
--
作者:
Davydov DR;Halpert JR

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根据药物代谢细胞色素P450的协同性机制的初始假设,P450活性位点中单个底物分子的松散配合导致需要结合多个配体分子以进行有效催化。虽然多个配体的活性位点的同时占用现在已经很好地建立,有越来越多的证据表明,协同性的机械基础也涉及一个重要的配体诱导的构象转变。此外,最近的研究表明,酶的构象异质性是稳定的几个P450分子的配体依赖性相互作用。应用寡聚体变构酶的概念,微粒体细胞色素P450结合的活性位点的多个配体占用的一般范例提供了一个很好的解释复杂的表现的酶的非典型动力学行为。
According to the initial hypothesis on the mechanisms of cooperativity in drug-metabolizing cytochromes P450, a loose fit of a single substrate molecule in the P450 active site results in a requirement for the binding of multiple ligand molecules for efficient catalysis. Although simultaneous occupancy of the active site by multiple ligands is now well established, there is increasing evidence that the mechanistic basis of cooperativity also involves an important ligand-induced conformational transition. Moreover, recent studies demonstrate that the conformational heterogeneity of the enzyme is stabilized by ligand-dependent interactions of several P450 molecules. Application of the concept of an oligomeric allosteric enzyme to microsomal cytochromes P450 in combination with a general paradigm of multiple ligand occupancy of the active site provides an excellent explanation for complex manifestations of the atypical kinetic behavior of the enzyme.
DOI: 10.1021/bi8011803
发表时间: 2008-10-28
期刊: BIOCHEMISTRY
影响因子: 2.9
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