Effect of atom- and group-based truncations on biomolecules simulated with reaction-field electrostatics.

Effect of atom- and group-based truncations on biomolecules simulated with reaction-field electrostatics.
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DOI:
10.1007/s00894-011-0975-x
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发表时间:
2011-11
影响因子:
2.2
通讯作者:
Baumketner, Andrij
Baumketner, Andrij
中科院分区:
化学4区
文献类型:
--
作者:
Ni, Boris;Baumketner, Andrij

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The performance of the reaction-field method of electrostatics is tested in molecular dynamics simulations of protein human interleukin-4 and a short DNA fragment in explicit solvent. Two truncation schemes are considered: one based on the position of atomic charges in water molecules and the other on the position of groups of charges. The group-based truncation leads to the melting of the DNA double helix. In contrast, the atom-based truncation maintains the helical structure intact. Similarly for the protein, the group-based truncation leads to an unfolding at pH 2 while the atom-based truncation produces stable trajectories at low and normal pH, in agreement with experiment. Artificial repulsion between charged residues associated with the group-based truncation is identified as the microscopic reason behind unfolding of the protein. Implications of different truncation schemes in reaction-field simulations of biomolecules are discussed.
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