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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/9492

Title: Association of nicotinic acid with a poly(amidoamine) dendrimer studied by molecular dynamics simulations
Authors: Caballero, J.
Poblete, H.
Navarro, C.
Alzate-Morales, J.H.
Keywords: PAMAM
Nicotinic acid
Molecular dynamics
Issue Date: Feb-2013
Citation: JOURNAL OF MOLECULAR GRAPHICS & MODELLING Volume: 39 Pages: 71-78 DOI: 10.1016/j.jmgm.2012.11.003
Abstract: The interaction of poly(amidoamine)-G3 (PAMAM-G3) dendrimer with nicotinic acid (NA) was investigated by using molecular dynamics (MD) simulations. First, sample free energy profiles of NA crossing PAMAM-G3 at pH 6 and 3 were computed using the adaptive biasing force (ABF) method. We found that PAMAM-G3 provides a more appropriate environment for NA inclusion when internal tertiary amine groups are unprotonated (at pH 6). However, when internal tertiary amine groups are protonated (at pH 3), the PAMAM cavities are less hydrophobic; therefore the drug-dendrimer interactions become similar to drug-solvent interactions. Traditional MD simulations were also performed to investigate the structural stability of the PAMAM-NA complexes near the free energy minima at pH 6. We found that association of NA and PAMAM adopts a preferred binding mode around the surface of PAMAM, where hydrogen bond (HB) interactions with the amino and amide NH groups of the nearby monomers are established. These interactions are very stable whether additional van der Waals interactions between pyridine ring of NA and methylene groups of the more external monomers of PAMAM are established. (C) 2012 Elsevier Inc. All rights reserved.
Description: Caballero, J (reprint author) Univ Talca, Ctr Bioinformat & Simulac Mol, 2 Norte 685,Casilla 721, Talca, Chile.
URI: http://dspace.utalca.cl/handle/1950/9492
ISSN: 1093-3263
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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