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Physical interaction and assembly of Bacillus subtilis spore coat proteins CotE and CotZ studied by atomic force microscopy.

J. Struct. Biol.2016 Aug;195(2):245-251. Epub 2016 Jun 15
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摘要


The spore of Bacillus subtilis, a dormant type of cell, is surrounded by a complex multilayered protein structure known as the coat. It is composed of over 70 proteins and essential for the spore to withstand extreme environmental conditions and allow germination under favorable conditions. However, understanding how the properties of the coat arise from the interactions among all these proteins is an important challenge. Moreover, many specific protein-protein interactions among the coat proteins are crucial for coat assembly. In this study, atomic force microscopy (AFM) based single molecule force spectroscopy (SMFS) was applied to investigate the interaction as a dynamic process between two morphogenetic coat proteins, CotE and CotZ. The unbinding force and kinetic parameters characterizing the interaction between CotE and CotZ were obtained. It is found that there is a strong affinity between CotE and CotZ. Furthermore, the assembly behaviors of CotE and CotZ, individually or in combination, were studied by AFM at solid-liquid interfaces. Our results revealed that CotE-CotZ assembly is dependent on their molar ratios and the interaction between CotE and CotZ involves in the CotE-CotZ assembly.

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