177d
From Proteopedia
SOLUTION STRUCTURE AND HYDRATION PATTERNS OF A PYRIMIDINE(DOT)PURINE(DOT)PYRIMIDINE DNA TRIPLEX CONTAINING A NOVEL T(DOT)CG TRIPLE
Overview
The solution structure of a pyrimidine.purine.pyrimidine DNA triplex containing a novel T.CG base-triple has been determined via two and three-dimensional NMR spectroscopy and restrained molecular dynamics simulations incorporating explicit solvent and counter-ions. The T.CG triple, which expands the triplex code, is stabilized by a single hydrogen bond between the O-2 atom of thymine and the free amino proton of cytosine in the Watson-Crick C.G base-pair. This hydrogen bonding alignment produces large variations in helical twist at the dinucleotide steps involving the thymine residue. Localized structural perturbations in the purine-rich strand of the molecule are observed around the cytosine residue in the T.CG triple. Globally, the triplex resembles the solution structure of a previously solved pyrimidine.purine.pyrimidine DNA triplex containing an unusual G.TA triple. Also conserved are the sites and patterns of hydration in the two triplexes.
About this Structure
Full crystallographic information is available from OCA.
Reference
Solution structure and hydration patterns of a pyrimidine.purine.pyrimidine DNA triplex containing a novel T.CG base-triple., Radhakrishnan I, Patel DJ, J Mol Biol. 1994 Aug 26;241(4):600-19. PMID:8057381 Page seeded by OCA on Fri May 2 09:33:23 2008
Categories: Patel, D J. | Radhakrishnan, I. | Dna | Nmr | Triplex
