Influence of Calcium Binding on Conformations and Motions of Anionic Polyamino Acids. Effect of Side Chain Length.

ABSTRACT: Investigation of the effect of CaCl₂ salt on conformations of two anionic poly(amino acids) with different side chain lengths, poly-(α-l glutamic acid) (PGA) and poly-(α-l aspartic acid) (PASA), was performed by atomistic molecular dynamics (MD) simulations. The simulations were performed using both unbiased MD and the Hamiltonian replica exchange (HRE) method. The results show that at low CaCl₂ concentration adsorption of Ca²⁺ ions lead to a significant chain size reduction for both PGA and PASA. With the increase in concentration, the chains sizes partially recover due to electrostatic repulsion between the adsorbed Ca²⁺ ions. Here, the side chain length becomes important. Due to the longer side chain and its ability to distance the charged gro

SUBMITTER: Tolmachev D 

PROVIDER: S-EPMC7362111 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature