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Published in PLoS One - 11/13/2018
Nathalie Duclert-Savatier, Guillaume Bouvier, Michael Nilges, Thérèse E. Malliavin
. 2018; 13(11): e0207899.
Published online 2018 Nov 29. doi: 10.1371/journal.pone.0207899
PMCID: PMC6264157
PMID: 30496238

Abstract

In the histidine kinase family, the HAMP and DHp domains are considered to play an important role into the transmission of signal arising from environmental conditions to the auto-phosphorylation site and to the binding site of response regulator. Several conformational motions inside HAMP have been proposed to transmit this signal: (i) the gearbox model, (ii) α helices rotations, pistons and scissoring, (iii) transition between ordered and disordered states. In the present work, we explore by temperature-accelerated molecular dynamics (TAMD), an enhanced sampling technique, the conformational space of the cytoplasmic region of histidine kinase CpxA. Several HAMP motions, corresponding to α helices rotations, pistoning and scissoring have been detected and correlated to the segmental motions of HAMP and DHp domains of CpxA.