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Modeling ganglioside headgroups by conformational analysis and molecular dynamics

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Abstract

The conformations and dynamics of gangliosides GM1, GM2, 6′-GM2 and GM4 have been studied by computational means, and the results compared to NMR data. Unconstrained conformational searches were run using the AMBER* force field augmented by MNDO derived parameters for the Neu5Ac anomeric torsion, the GB/SA water solvation model, and the MC/EM alogorithm; extended (10–12[emsp4 ]ns) dynamic simulations in GB/SA water were performed with the MC/SD protocol, and the stored structures were minimized. The overall mobility of the Neu5Acα2,3Gal linkage and the position of its minimum energy conformation have been shown to depend mainly on the presence or the absence of a GalNAc residue at the adjacent position. The best quantitative agreement with the available NOE data was achieved after minimization of the structures stored during the MC/SD dynamic runs. The latter protocol appears to reproduce satisfactorily the available experimental data, and can be used with confidence to build three-dimensional models of ganglioside headgroups.

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Authors and Affiliations

  1. Dipartimento di Chimica e Biochimica Medica, Universita` di Milano (Italy), via Fratelli Cervi 93, I-20090, Segrate (Milano)

    Paola Brocca & Sandro Sonnino

  2. Dipartimento di Chimica Organica e Industriale, Universita` di Milano (Italy), via Venezian 21, I-20133, Milano

    Anna Bernardi & Laura Raimondi

Authors
  1. Paola Brocca
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  2. Anna Bernardi
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  3. Laura Raimondi
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  4. Sandro Sonnino
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Brocca, P., Bernardi, A., Raimondi, L. et al. Modeling ganglioside headgroups by conformational analysis and molecular dynamics. Glycoconj J 17, 283–299 (2000). https://doi.org/10.1023/A:1007161319700

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