Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Conformational Analysis of Trimannoside and Bisected Trimannoside Using Aqueous Molecular Dynamics Simulations

  • Kim, Hyun-Myung (Department of Advanced Technology Fusion, Konkuk University) ;
  • Choi, Young-Jin (Biochip Research Center, Hoseo University) ;
  • Lee, Jong-Hyun (Department of Advanced Technology Fusion, Konkuk University) ;
  • Jeong, Karp-Joo (Department of Advanced Technology Fusion, Konkuk University) ;
  • Jung, Seun-Ho (Department of Bioscience and Biotechnology & Bio/Molecular Informatics Center, Konkuk University)
  • Published : 2009.11.20
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Abstract

The conformational properties of oligosaccharides are important to understand carbohydrate-protein interactions. A trimannoside, methyl 3,6-di-O-($\alpha$-D-Man)-$\alpha$-D-Man (TRIMAN) is a basic unit of N-linked oligosaccharides. This TRIMAN moiety was further modified by GlcNAc (BISECT), which is important to biological activity of N-glycan. To characterize the trimannoside and its bisecting one we performed a molecular dynamics simulation in water. The resulting models show the conformational transition with two major and minor conformations. The major conformational transition results from the $\omega$ angle transition; another minor transition is due to the $\psi$ angle transition of $\alpha$ (1 $\rightarrow$ 6) linkage. The introduction of bisecting GlcNAc on TRIMAN made the different population of the major and minor conformations of the TRIMAN moiety. Omega ($\omega$) angle distribution is largely changed and the population of gt conformation is increased in BISECT oligosaccharide. The inter-residue hydrogen bonds and water bridges via bisecting GlcNAc residue make alterations on the local and overall conformation of TRIMAN moiety. These changes of conformational distribution for TRIMAN moiety can affect the overall conformation of N-glycan and the biological activity of glycoprotein.

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References

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