Glycoconjugate Journal

, Volume 31, Issue 5, pp 365–386 | Cite as

Molecular dynamics study of the conformations of glycosidic linkages in sialic acid modified ganglioside GM3 analogues



The objective of the present study is to model the analogues of monosialoganglioside (GM3) by making modifications in its sialic acid residue with different substitutions in aqueous environment and to determine their structural stability based upon computational molecular dynamics. Molecular mechanics and molecular dynamics investigation was carried out to study the conformational preferences of the analogues of GM3. Dynamic simulations were carried out on the analogues of GM3 varying in the substituents at C-1, C-4, C-5, C-8 and C-9 positions of their sialic acid or Neuraminic acid (NeuAc) residue. The analogues are soaked in a periodic box of TIP3P water as solvent and subjected to a 10 ns molecular dynamics (MD) simulation using AMBER ff03 and gaff force fields with 30 ps equilibration. The analogue of GM3 with 9-N-succNeuAc (analogue5, C9 substitution) was observed to have the lowest energy of −6112.5 kcal/mol. Graphical analysis made on the MD trajectory reveals the direct and water mediated hydrogen bonds existing in these sialic acid analogues. The preferable conformations for glycosidic linkages of GM3 analogues found in different minimum energy regions in the conformational maps were identified. This study sheds light on the conformational preferences of GM3 analogues which may be essential for the design of GM3 analogues as inhibitors for different ganglioside specific pathogenic proteins such as bacterial toxins, influenza toxins and neuraminidases.


Ganglioside GM3 analogues AMBER Molecular Modeling Molecular Mechanics Molecular Dynamics 



The authors acknowledge the Science and Engineering Research Board (SERB), Department of Science and Technology, Govt. of India (SERB Sanction no. SR/FT/LS-157/2009 dt 30.04.2012) - OYS scheme project grant sanctioned to the corresponding author.


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Bioinformatics, School of Biotechnology and Health SciencesKarunya UniversityCoimbatoreIndia

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