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Molecular mechanism of activation-triggered subunit exchange in Ca 2+ /calmodulin-dependent protein kinase II

Journal Article · · eLife
DOI:https://doi.org/10.7554/eLife.13405· OSTI ID:1379139
 [1];  [1];  [2];  [1];  [3];  [2];  [1];  [1];  [1];  [4];  [1];  [1];  [5];  [2];  [6]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology, California Inst. for Quantitative Biosciences, Howard Hughes Medical Inst.
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
  3. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology, California Inst. for Quantitative Biosciences, Howard Hughes Medical Inst., Biophysics Graduate Group
  4. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology, Howard Hughes Medical Inst.
  5. Allosteros Therapeutics, Sunnyvale, CA (United States)
  6. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology, California Inst. for Quantitative Biosciences, Howard Hughes Medical Inst., Biophysics Graduate Group; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Division

Activation triggers the exchange of subunits in Ca2+/calmodulin-dependent protein kinase II (CaMKII), an oligomeric enzyme that is critical for learning, memory, and cardiac function. The mechanism by which subunit exchange occurs remains elusive. We show that the human CaMKII holoenzyme exists in dodecameric and tetradecameric forms, and that the calmodulin (CaM)-binding element of CaMKII can bind to the hub of the holoenzyme and destabilize it to release dimers. The structures of CaMKII from two distantly diverged organisms suggest that the CaM-binding element of activated CaMKII acts as a wedge by docking at intersubunit interfaces in the hub. This converts the hub into a spiral form that can release or gain CaMKII dimers. Our data reveal a three-way competition for the CaM-binding element, whereby phosphorylation biases it towards the hub interface, away from the kinase domain and calmodulin, thus unlocking the ability of activated CaMKII holoenzymes to exchange dimers with unactivated ones.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1379139
Journal Information:
eLife, Journal Name: eLife Journal Issue: MARCH2016 Vol. 5; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (13)

Variation in assembly stoichiometry in non‐metazoan homologs of the hub domain of Ca 2+ /calmodulin‐dependent protein kinase II journal April 2019
The CaMKII holoenzyme structure in activation-competent conformations journal June 2017
Structure and assembly of calcium homeostasis modulator proteins journal January 2020
From molecular chaperones to membrane motors: through the lens of a mass spectrometrist journal February 2017
FRET-based sensor for CaMKII activity (FRESCA): A useful tool for assessing CaMKII activity in response to Ca 2+ oscillations in live cells journal June 2019
Mechanics of CaMKII-actin networks posted_content May 2018
Evolution of protein kinase substrate recognition at the active site posted_content October 2018
Heterogeneity in human hippocampal CaMKII transcripts reveals allosteric hub-dependent regulation journal July 2020
Evolution of protein kinase substrate recognition at the active site journal June 2019
A multi-state model of the CaMKII dodecamer suggests a role for calmodulin in maintenance of autophosphorylation journal December 2019
Adaptation of Plants to Salt Stress: Characterization of Na+ and K+ Transporters and Role of CBL Gene Family in Regulating Salt Stress Response journal October 2019
Subunit exchange enhances information retention by CaMKII in dendritic spines journal November 2018
A homozygous loss-of-function CAMK2A mutation causes growth delay, frequent seizures and severe intellectual disability journal May 2018

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