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Membrane proteins modulate the bilayer curvature in the bacterial virus Bam35

机译:膜蛋白调节细菌病毒Bam35中的双层曲率

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Biological membranes control the flow of molecules into and out of cells, and they transmit information about the milieu. Structural studies of membrane-containing viruses provide one way to study these membranes in situ. Cryo-electron microscopy and image reconstruction of bacteriophage Bam35 to 7.3 angstrom resolution revealed a membrane bilayer constrained within an icosahedrally symmetric pseudo T = 25 capsid. A total of 60 large transmembrane protein complexes affect the curvature and thickness of the membrane. Here, we describe these membrane parameters quantitatively. Furthermore, we show that Bam35 differs from bacteriophage PRD1 in these parameters, even though the two viruses share the same principles of capsid architecture. Most notably, each virus possesses a tape measure protein suggesting a general mechanism for capsid size determination in icosahedral viruses.
机译:生物膜控制分子流入和流出细胞的流程,并传递有关环境的信息。含膜病毒的结构研究提供了一种原位研究这些膜的方法。冷冻电子显微镜和噬菌体Bam35的图像重建至7.3埃分辨率,揭示了限制在二十面体对称假T = 25衣壳内的双层膜。总共60种大型跨膜蛋白复合物会影响膜的曲率和厚度。在这里,我们定量描述这些膜参数。此外,我们显示Bam35在这些参数上与噬菌体PRD1不同,即使这两种病毒具有相同的衣壳结构原理。最值得注意的是,每种病毒都具有卷尺蛋白,这表明确定二十面体病毒衣壳大小的一般机制。

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