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Structural characteristics of 2'-O-(2-methoxyethyl)-modified nucleic acids from molecular dynamics simulations
K E Lind1, V Mohan, M Manoharan
1Department of Medicinal Chemistry and Minnesota Supercomputing Institute, University of Minnesota,308 Harvard Street SE, Minneapolis, MN 55455, USA.
Nucleic Acids Research
|August 1, 1998
Summary
Molecular dynamics simulations reveal that 2'- O -(2-methoxyethyl) (MOE) modifications stabilize nucleic acid duplexes. The MOE substitution locks sugars into a C3' endo conformation, promoting a stable A-form structure.
Area of Science:
- Biochemistry
- Computational Chemistry
- Structural Biology
Background:
- Nucleic acid modifications are crucial for therapeutic applications.
- Understanding the structural impact of 2"- O -(2-methoxyethyl) (MOE) substitutions is key to designing effective nucleic acid drugs.
Purpose of the Study:
- To investigate the structural and physical properties of MOE-substituted nucleic acid duplexes.
- To rationalize the stability imparted by 2"- O -(2-methoxyethyl) side chains using molecular dynamics simulations.
Main Methods:
- Nanosecond molecular dynamics simulations in aqueous solution.
- Utilized the particle mesh Ewald method and AMBER 4.1 force field.
- Compared simulated duplexes with crystal structures of MOE-containing DNA.
Main Results:
- Simulated MOE duplexes adopt a stable A-form structure with C3' endo sugar pucker.
- The 2"- O -(2-methoxyethyl) substitution effectively locks the sugar conformation.
- MOE side chains exhibit a rigid geometry, contributing to duplex stability.
Conclusions:
- 2"- O -(2-methoxyethyl) modifications confer significant stability to nucleic acid duplexes.
- The observed stability is attributed to the constrained sugar pucker induced by MOE substitutions.
- These findings support the use of MOE-modified nucleic acids in therapeutic strategies.