Abstract
The dodecameric holoenzyme of calcium–calmodulin-dependent protein kinase II (CaMKII) responds to high-frequency Ca2+ pulses to become Ca2+ independent. A simple coincidence-detector model for Ca2+-frequency dependency assumes noncooperative activation of kinase domains. We show that activation of CaMKII by Ca2+–calmodulin is cooperative, with a Hill coefficient of ∼3.0, implying sequential kinase-domain activation beyond dimeric units. We present data for a model in which cooperative activation includes the intersubunit 'capture' of regulatory segments. Such a capture interaction is seen in a crystal structure that shows extensive contacts between the regulatory segment of one kinase and the catalytic domain of another. These interactions are mimicked by a natural inhibitor of CaMKII. Our results show that a simple coincidence-detection model cannot be operative and point to the importance of kinetic dissection of the frequency-response mechanism in future experiments.
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Acknowledgements
We thank D. King for generous assistance with synthesis of peptides and MS, A.C. Nairn, A. Hoelz, O.S. Rosenberg, J.A. Winger and members of the Kuriyan laboratory for helpful discussions, P.R. Visperas and X. Cao for technical assistance, J. Dixon (University of California, San Diego) for the kind gift of λ phosphatase vector, C. Ralston and the staff at Advanced Light Source beamline 8.2.2 for their assistance with data collection and M.A. Seeliger, N. Jura, J. Gureasko and J. S. Iwig for critical reading of the manuscript. The Advanced Light Source is supported by the US Department of Energy under contract DE-AC03-76SF00098 at the Lawrence Berkeley National Laboratory.
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L.H.C., P.P., H.S. and J.K. designed the experiments; L.H.C., P.P. and L.A.B. performed the experiments and analyzed the data; S.D. performed the Hill coefficient analyses; L.H.C. and J.K. wrote the paper.
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Chao, L., Pellicena, P., Deindl, S. et al. Intersubunit capture of regulatory segments is a component of cooperative CaMKII activation. Nat Struct Mol Biol 17, 264–272 (2010). https://doi.org/10.1038/nsmb.1751
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DOI: https://doi.org/10.1038/nsmb.1751
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