Structure-based mutagenesis reveals the albumin-binding site of the neonatal Fc receptor.

Structure-based mutagenesis reveals the albumin-binding site of the neonatal Fc receptor.
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DOI:
10.1038/ncomms1607
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发表时间:
2012-01-03
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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白蛋白是血液中最丰富的蛋白质,在其中它作为脂肪酸和药物的转运体具有关键作用。与IgG一样,白蛋白具有较长的血清半衰期,通过与新生儿Fc受体FcRn相互作用介导的pH依赖性再循环而免受降解。虽然FcRn与IgG的相互作用在原子水平上得到了很好的表征,但其与白蛋白的相互作用却没有得到很好的表征。在这里,我们提出了基于结构的建模的FcRn-白蛋白复合物,支持结合位点特异性突变体的分析,提供了在相互作用界面的pH敏感的离子网络的存在下的机械证据。这些网络涉及FcRn和白蛋白结构域III中的保守组氨酸。组氨酸也有助于分子内相互作用,使相互作用表面的柔性环稳定。FcRn-白蛋白复合物的分子细节可以指导具有改变的血清半衰期的新型白蛋白变体作为药物载体的开发。白蛋白转运蛋白在血液中循环,并通过与新生儿Fc受体的相互作用而免受降解。Andersen等人研究了新生儿Fc受体的白蛋白结合位点,并在结合界面发现了pH敏感的离子网络。
Albumin is the most abundant protein in blood where it has a pivotal role as a transporter of fatty acids and drugs. Like IgG, albumin has long serum half-life, protected from degradation by pH-dependent recycling mediated by interaction with the neonatal Fc receptor, FcRn. Although the FcRn interaction with IgG is well characterized at the atomic level, its interaction with albumin is not. Here we present structure-based modelling of the FcRn–albumin complex, supported by binding analysis of site-specific mutants, providing mechanistic evidence for the presence of pH-sensitive ionic networks at the interaction interface. These networks involve conserved histidines in both FcRn and albumin domain III. Histidines also contribute to intramolecular interactions that stabilize the otherwise flexible loops at both the interacting surfaces. Molecular details of the FcRn–albumin complex may guide the development of novel albumin variants with altered serum half-life as carriers of drugs. Albumin transport proteins circulate in the blood and are protected from degradation by interaction with the neonatal Fc receptor. Andersen et al. investigate the albumin binding site of the neonatal Fc receptor and find pH sensitive ionic networks at the binding interface.
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