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To evaluate the stability of G-quadruplex structures comprehensively, parallel (type I), antiparallel (type II), and hybrid (type III) G-quadruplexes in the presence of monovalent and divalent cations were assessed by UV-melting technique under dilute and crowded conditions. In the presence of monovalent cations, the stability of G-quadruplexes was increased by the presence of molecular crowding agents...
A well known rule of high thermal stability of GC-rich DNA helices can be reversed with the use of certain ions, rendering AT-rich duplexes more stable. We have sought to elucidate the structural basis of this phenomenon for choline dihydrogen phosphate, an ionic liquid known for extension of long-term chemical stability of biomolecules. NMR experiments complemented with CD spectroscopy revealed subtle...
The thrombin-binding DNA aptamer (TBA) 5′-d(GGTTGGTGTGGTTGG)-3′ forms a G-quadruplex that is necessary for binding to the coagulation factor thrombin. The stability of the G-quadruplex of TBA when bound to thrombin and potassium ion (K + ) were investigated for the wild-type oligonucleotide and for mutants in which thymine residues were substituted by adenine. In the presence of thrombin,...
Living cells contain a variety of biomolecules including nucleic acids, proteins, polysaccharides, and metabolites as well as other soluble and insoluble components. These biomolecules occupy a significant fraction (20–40%) of the cellular volume. The total concentration of biomolecules reaches 400gL −1 , leading to a crowded intracellular environment referred to as molecular crowding. Therefore,...
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