Cited by 92Neuroscience and Neuropharmacology ResearchProtein Kinase Regulation and GTPase SignalingSignaling Pathways in Disease

A Dynamic Model of Interactions of Ca2+, Calmodulin, and Catalytic Subunits of Ca2+/Calmodulin-Dependent Protein Kinase II

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Pepke, Shirley, Kinzer-Ursem, Tamara, Mihalas, Stefan, Kennedy, Mary B.·2010·PLoS Computational Biology

Abstract

During the acquisition of memories, influx of Ca2+ into the postsynaptic spine through the pores of activated N-methyl-D-aspartate-type glutamate receptors triggers processes that change the strength of excitatory synapses. The pattern of Ca2+influx during the first few seconds of activity is interpreted within the Ca2+-dependent signaling network such that synaptic strength is eventually either potentiated or depressed. Many of the critical signaling enzymes that control synaptic plasticity,including Ca2+/calmodulin-dependent protein kinase II (CaMKII), are regulated by calmodulin, a small protein that can bindup to 4 Ca2+ ions. As a first step toward clarifying how the Ca2+-signaling network decides between potentiation or depression, we have created a kinetic model of the interactions of Ca2+, calmodulin, and CaMKII that represents our best understanding of the dynamics of these interactions under conditions that resemble those in a postsynaptic spine. We constrained parameters of the model from data in the literature, or from our own measurements, and then predicted time courses of activation and autophosphorylation of CaMKII under a variety of conditions. Simulations showed that species of calmodulin with fewer than four bound Ca2+ play a significant role in activation of CaMKII in the physiological regime,supporting the notion that processing of Ca2+ signals in a spine involves competition among target enzymes for binding to unsaturated species of CaM in an environment in which the concentration of Ca2+ is fluctuating rapidly. Indeed, we showed that dependence of activation on the frequency of Ca2+ transients arises from the kinetics of interaction of fluctuating Ca2+with calmodulin/CaMKII complexes. We used parameter sensitivity analysis to identify which parameters will be most beneficial to measure more carefully to improve the accuracy of predictions. This model provides a quantitative base from which to build more complex dynamic models of postsynaptic signal transduction during learning.

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Crossref · 10.1371/journal.pcbi.1000675

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  • CaM can activate CaMKII when only two of its four Ca2+ binding sites are occupied.

    “This is despite the fact that CaM can activate CaMKII when only two of its four Ca2+ binding sites are occupied (112, 113).”

    From Synaptic memory and CaMKII (2023) · cites this paper as [113]

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  1. [40]Wolfram Research I 2007 Mathematica Edition 6.0 Champaign, Illinois
  2. [51]De Koninck P Schulman H 1998 Sensitivity of CaM Kinase II to the frequency of Ca2+ oscillations. Science 279 227 230 9422695
  3. [54]Bradshaw JM Hudmon A Shulman H 2002 Chemical Quenched Flow Kinetic Studies Indicate an Intraholoenzyme Autophosphorylation Mechanism for Ca2+. J Biol Chem 277 20991 20998 11925447

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Authors
Pepke, S., Kinzer-Ursem, T., Mihalas, S., & Kennedy, M. B.
Affiliations
California Institute of Technology (US)
Corresponding author
Kennedy, Mary B.
Venue
PLoS Computational Biology
Published
2010-02-12
Volume
6
Issue
2
Pages
e1000675
ISSN
  • 1553-734X (ISSN-L)
  • 1553-7358
OpenAlex
W2017789880
Cited by
92
References
56
Citations by year
2026: 4 · 2025: 6 · 2024: 7 · 2023: 5 · 2022: 2 · 2021: 9 · 2020: 7 · 2019: 13 · 2018: 6 · 2017: 3 · 2016: 4 · 2015: 7 · 2014: 5 · 2013: 5 · 2012: 5
FWCI
1.81
Type
journal article
Language
en
Open access
Locations
  • PLoS Computational Biology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion, cc-by)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
Funders
  • Gordon and Betty Moore Foundation
  • National Institutes of Health (NS44306)
  • National Institute on Drug Abuse (R01DA030749)
  • National Institute of Neurological Disorders and Stroke (NS 44306, P01NS044306)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Signaling Pathways in Disease
Keywords
CaMKII, calmodulin, calcium signaling, synaptic plasticity, NMDA receptor, postsynaptic spines, autophosphorylation, kinetic modeling, parameter sensitivity analysis, calcium transients, synaptic potentiation and depression, learning
MeSH terms
Calcium, Calmodulin, Kinetics, Models, Chemical, Phosphorylation, Protein Binding, Thermodynamics, Multiprotein Complexes, Calcium-Calmodulin-Dependent Protein Kinase Type 2, Molecular Dynamics Simulation

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