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© Research
Publication : Frontiers in molecular biosciences

Analyzing In Silico the Relationship Between the Activation of the Edema Factor and Its Interaction With Calmodulin.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Frontiers in molecular biosciences - 01 Jan 2020

Pitard I, Monet D, Goossens PL, Blondel A, Malliavin TE,

Link to Pubmed [PMID] – 33344505

Link to DOI – 10.3389/fmolb.2020.586544

Front Mol Biosci 2020 ; 7(): 586544

Molecular dynamics (MD) simulations have been recorded on the complex between the edema factor (EF) of Bacilllus anthracis and calmodulin (CaM), starting from a structure with the orthosteric inhibitor adefovir bound in the EF catalytic site. The starting structure has been destabilized by alternately suppressing different co-factors, such as adefovir ligand or ions, revealing several long-distance correlations between the conformation of CaM, the geometry of the CaM/EF interface, the enzymatic site and the overall organization of the complex. An allosteric communication between CaM/EF interface and the EF catalytic site, highlighted by these correlations, was confirmed by several bioinformatics approaches from the literature. A network of hydrogen bonds and stacking interactions extending from the helix V of of CaM, and the residues of the switches A, B and C, and connecting to catalytic site residues, is a plausible candidate for the mediation of allosteric communication. The greatest variability in volume between the different MD conditions was also found for cavities present at the EF/CaM interface and in the EF catalytic site. The similarity between the predictions from literature and the volume variability might introduce the volume variability as new descriptor of allostery.

https://pubmed.ncbi.nlm.nih.gov/33344505