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Conformational coupling by trans-phosphorylation in calcium calmodulin dependent kinase II

Journal Article · · PLoS Computational Biology (Online)
 [1];  [2];  [3];  [4]
  1. Brunel Univ., Uxbridge (United Kingdom); The Thomas Young Centre for Theory and Simulation of Materials, London (United Kingdom); Francis Crick Inst., London (United Kingdom). Computational Cell and Molecular Biology; DOE/OSTI
  2. Allosteros Therapeutics, Inc., Sunnyvale, CA (United States)
  3. Francis Crick Inst., London (United Kingdom). Computational Cell and Molecular Biology; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Biology Consortium
  4. Max Planck Inst. for Biophysical Chemistry (Germany)
The calcium calmodulin-dependent protein kinase II (CaMKII) is a dodecameric holoenzyme important for encoding memory. Its activation, triggered by binding of calcium-calmodulin, persists autonomously after calmodulin dissociation. One (receiver) kinase captures and subsequently phosphorylates the regulatory domain peptide of a donor kinase forming a chained dimer as the first stage of autonomous activation. Protein dynamics simulations examined the conformational changes triggered by dimer formation and phosphorylation, aimed to provide a molecular rationale for human mutations that result in learning disabilities. Ensembles generated from X-ray crystal structures were characterized by network centrality and community analysis. Mutual information related collective motions to local fragment dynamics encoded with a structural alphabet. Implicit solvent tCONCOORD conformational ensembles revealed the dynamic architecture of inactive kinase domains was co-opted in the activated dimer but the network hub shifted from the nucleotide binding cleft to the captured peptide. Explicit solvent molecular dynamics (MD) showed nucleotide and substrate binding determinants formed coupled nodes in long-range signal relays between regulatory peptides in the dimer. Strain in the extended captured peptide was balanced by reduced flexibility of the receiver kinase C-lobe core. The relays were organized around a hydrophobic patch between the captured peptide and a key binding helix. The human mutations aligned along the relays. Thus, these mutations could disrupt the allosteric network alternatively, or in addition, to altered binding affinities. Non-binding protein sectors distant from the binding sites mediated the allosteric signalling; providing possible targets for inhibitor design. Phosphorylation of the peptide modulated the dielectric of its binding pocket to strengthen the patch, non-binding sectors, domain interface and temporal correlations between parallel relays. These results provide the molecular details underlying the reported positive kinase cooperativity to enrich the discussion on how autonomous activation by phosphorylation leads to long-term behavioural effects.
Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
Royal Society Collaborative Exchange; U.S National Institutes of Health; USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1627258
Journal Information:
PLoS Computational Biology (Online), Journal Name: PLoS Computational Biology (Online) Journal Issue: 5 Vol. 15; ISSN 1553-7358
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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