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Energy Landscapes of Mini-Dumbbell DNA Octanucleotides.
Journal of Chemical Theory and Computation 2018 July 11
Single-stranded DNA structures play a significant role in biological systems, in particular during replication, translation, and DNA repair. Tracts of simple repetitive DNA are associated with slipped-strand mispairing, which can lead to genetic diseases. Recent NMR studies of TTTA and CCTG repeats have shown that these sequences form mini-dumbbells (MDBs), leading to frameshift mutations. Here we explore the energy landscapes of (CCTG)2 and (TTTA)2 , which are currently the smallest known molecules to form MDBs. While (CCTG)2 MDBs are stable, (TTTA)2 exhibits numerous other structures with lower energies. A key factor identified in the stabilization of MDB structures is the bonding strength between residues 1 and 4, and 5 and 8.
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