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<Synopsis> Incubation of three clock proteins, KaiA, KaiB, and KaiC, with ATP induces a KaiC phosphorylation cycle that is a potential clock pacemaker in cyanobacterium Synechococcus elongatus PCC 7942. To take a structural snapshot of the oscillator, we followed the dynamic oscillatory processes of the Kai proteins using real-time small-angle x-ray scattering techniques. The scattering pattern of a ternary mixture robustly oscillated with a period of approximately 24 h, indicating a repeated assembly and disassembly of the Kai complexes. In the presentation, I will discuss the size and shape of these clock complexes.

1P023 Real-time SAXS Observation of Assembly and Disassembly Dynamics of Cyanobacterial Circadian Clock Proteins