Atomic structure and handedness of the building block of a biological assembly.

Atomic structure and handedness of the building block of a biological assembly.
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生物组装构件的原子结构和旋手性

DOI:
10.1021/ja411362q
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发表时间:
2013
影响因子:
15
通讯作者:
A. Lange
A. Lange
中科院分区:
化学1区
文献类型:
--
作者:
A. Loquet;B. Habenstein;V. Chevelkov;S. K. Vasa;K. Giller;S. Becker;A. Lange

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非共价超分子组装体一般具有几个独特的亚基-亚基界面,这种组装的基本构件由几个亚基组成,并包含所有独特的界面。单体亚基的原子分辨结构通常通过结晶学或溶液核磁共振获得,并拟合到电子显微镜密度图中。然而,使用这种混合方法,在组装状态下完整的构建块的结构仍然未知。在这里,我们介绍了固态核磁共振原子结构的积木的III型分泌系统针。构建块结构由具有三个独特的超分子界面的同源四聚体亚单位复合体组成。在原子细节上求解了界面上的侧链位置。高分辨率结构明确地揭示了组件的螺旋利手,被确定为III型分泌系统针的右旋。此外,每个亚单位的轴向上升可以从四聚体结构中提取出来,并通过每长度质量的测量独立验证。
Noncovalent supramolecular assemblies possess in general several unique subunit–subunit interfaces.The basic building block of such an assembly consists of several subunits and contains all unique interfaces. Atomic-resolution structures of monomeric subunits are typically accessed by crystallography or solution NMR and fitted into electron microscopy density maps. However, the structure of the intact building block in the assembled state remains unknown with this hybrid approach. Here, we present the solid-state NMR atomic structure of the building block of the type III secretion system needle. The building block structure consists of a homotetrameric subunit complex with three unique supramolecular interfaces. Side-chain positions at the interfaces were solved at atomic detail. The high-resolution structure reveals unambiguously the helical handedness of the assembly, determined to be right-handed for the type III secretion system needle.Additionally, the axial rise per subunit could be extracted from the tetramer structure and independently validated by mass-per-length measurements.
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