Direct interaction between KaiA and KaiB revealed by a site-directed spin labeling electron spin resonance analysis

Genes to Cells : Devoted to Molecular & Cellular Mechanisms
Risa MutohM Ishiura

Abstract

In cyanobacteria, three clock proteins, KaiA, KaiB and KaiC, play essential roles in generating circadian oscillations. The interactions of these proteins change during the circadian cycle. Here, we demonstrated direct interaction between KaiA and KaiB using electron spin resonance spectroscopy. We prepared cystein (Cys)-substituted mutants of Thermosynechococcus elongatus KaiB, labeled specifically their Cys residues with spin labels and measured the ESR spectra of the labeled KaiB. We found that KaiB labeled at the 64th residue showed spectral changes in the presence of KaiA, but not in the presence of KaiC or bovine serum albumin as a negative control. KaiB labeled at the 101st residue showed no such spectral changes even in the presence of KaiA. The results suggest that KaiB interacts with KaiA in the vicinity of the 64th residue of KaiB. Further analysis demonstrated that the C-terminal clock-oscillator domain of KaiA is responsible for this interaction.

References

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Citations

Feb 22, 2011·Annual Review of Biophysics·Carl Hirschie JohnsonMartin Egli
Oct 12, 2010·Current Opinion in Genetics & Development·Guogang DongSusan S Golden
Dec 11, 2014·Genes to Cells : Devoted to Molecular & Cellular Mechanisms·Takahiro IidaMasahiro Ishiura
Aug 2, 2016·Genes to Cells : Devoted to Molecular & Cellular Mechanisms·Reiko MurakamiMasahiro Ishiura
Jul 27, 2011·Proceedings of the National Academy of Sciences of the United States of America·Yong-Gang ChangAndy LiWang
Sep 13, 2012·Proceedings of the National Academy of Sciences of the United States of America·Yong-Gang ChangAndy LiWang

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