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Shigella flexneri Spa15 crystal structure verified in solution by double electron electron resonance.

机译:通过双电子电子共振在溶液中验证了志贺氏志贺氏菌Spa15晶体结构。

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摘要

Shigella flexneri Spa15 is a chaperone of the type 3 secretion system, which binds a number of effectors to ensure their stabilization prior to secretion. One of these effectors is IpgB1, a mimic of the human Ras-like Rho guanosine triphosphatase RhoG. In this study, Spa15 alone and in complex with IpgB1 has been studied by double electron electron resonance, an experiment that gives distance information showing the spacial separation of attached spin labels. This distance is explained by determining the crystal structure of the spin-labeled Spa15 where labels are seen to be buried in hydrophobic pockets. The double electron electron resonance experiment on the Spa15 complex with IpgB1 shows that IpgB1 does not bind Spa15 in the same way as is seen in the homologous Salmonella sp. chaperone:effector complex InvB:SipA.
机译:弗氏志贺氏菌Spa15是3型分泌系统的分子伴侣,可结合许多效应子以确保其在分泌前稳定下来。这些效应器之一是IpgB1,它是人类Ras样Rho鸟苷三磷酸酶RhoG的模拟物。在这项研究中,通过双电子电子共振研究了单独使用Spa15以及与IpgB1配合使用的Spa15,该实验给出了距离信息,显示了附着的自旋标记的空间分离。通过确定自旋标记的Spa15的晶体结构来解释此距离,在该结构中,标记被视为掩埋在疏水性口袋中。在具有IpgB1的Spa15络合物上的双电子电子共振实验表明,IpgB1不会以与同源沙门氏菌种中相同的方式结合Spa15。伴侣:效应复合物InvB:SipA。

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