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Updated: Jul 2, 2026

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
Published on: December 16, 2013
Metalloregulation of triple helix formation by control of the loop conformation
Toshihiro Ihara1, Yoshinobu Sato, Hiroshi Shimada
1Department of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University, Kumamoto, Japan. toshi@chem.kumamoto-u.ac.jp
Abstract:
The flexible polypyridine ligand, 2,2':6',2('')-terpyridine (terpy), was built into the backbone of oligonucleotides to form DNA conjugates. The terpy unit functioned as a good loop when the conjugates formed the bimolecular triplexes with complementary oligopurine. The triplex structure was destabilized by the specific interaction with divalent transition metal ions (Cu(2+), Zn(2+), and Fe(2+)), in particular Cu(2+) ions. This ion destabilized one of the triplexes by 4.2 kcalmol(-1) or made the triplex formation constant less than 1/10(3) at 298 K. This result is attributed to the substantial turbulence of the terminal structure of the triplexes.
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