Abstract:
:In conditions that mimic those of the living cell, where various biomolecules and other components are present, DNA strands can adopt many structures in addition to the canonical B-form duplex. Previous studies in the presence of cosolutes that induce molecular crowding showed that thermal stabilities of DNA structures are associated with the properties of the water molecules around the DNAs. To understand how cosolutes, such as ethylene glycol, affect the thermal stability of DNA structures, we investigated the thermodynamic properties of water molecules around a hairpin duplex and a G-quadruplex using grid inhomogeneous solvation theory (GIST) with or without cosolutes. Our analysis indicated that (i) cosolutes increased the free energy of water molecules around DNA by disrupting water-water interactions, (ii) ethylene glycol more effectively disrupted water-water interactions around Watson-Crick base pairs than those around G-quartets or non-paired bases, (iii) due to the negative electrostatic potential there was a thicker hydration shell around G-quartets than around Watson-Crick-paired bases. Our findings suggest that the thermal stability of the hydration shell around DNAs is one factor that affects the thermal stabilities of DNA structures under the crowding conditions.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Nakano M,Tateishi-Karimata H,Tanaka S,Tama F,Miyashita O,Nakano S,Sugimoto Ndoi
10.1093/nar/gkv1133subject
Has Abstractpub_date
2015-12-02 00:00:00pages
10114-25issue
21eissn
0305-1048issn
1362-4962pii
gkv1133journal_volume
43pub_type
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