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The formation of amyloid fibers and their deposition in the body is a characteristic of a number of devastating human diseases. Here, we propose a structural model, based on X-ray diffraction data, for the basic structure of an amyloid fibril formed by using the variants of the B1 domain of IgG binding protein G of Streptococcus. The model for the fibril incorporates four β sheets in a bundle with...
The cyanobacterial circadian oscillator consists of three Kai proteins, KaiA, KaiB, and KaiC, in its oscillation feedback loop. Structural comparison reveals that the Kai system resembles the F1-ATPase system in which KaiC is equivalent to α 3 β 3 , KaiA to γδϵ, and KaiB to its inhibitory factor. It also suggests that there exists a possible haemagglutinin-like spring-loaded mechanism...
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