2idn

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Template:STRUCTURE 2idn

NMR structure of a new modified Thrombin Binding Aptamer containing a 5'-5' inversion of polarity site

Overview

The solution structure of a new modified thrombin binding aptamer (TBA) containing a 5'-5' inversion of polarity site, namely d(3'GGT5'-5'TGGTGTGGTTGG3'), is reported. NMR and CD spectroscopy, as well as molecular dynamic and mechanic calculations, have been used to characterize the 3D structure. The modified oligonucleotide is characterized by a chair-like structure consisting of two G-tetrads connected by three edge-wise TT, TGT and TT loops. d(3'GGT5'-5'TGGTGTGGTTGG3') is characterized by an unusual folding, being three strands parallel to each other and only one strand oriented in opposite manner. This led to an anti-anti-anti-syn and syn-syn-syn-anti arrangement of the Gs in the two tetrads. The thermal stability of the modified oligonucleotide is 4 degrees C higher than the corresponding unmodified TBA. d(3'GGT5'-5'TGGTGTGGTTGG3') continues to display an anticoagulant activity, even if decreased with respect to the TBA.

About this Structure

Full crystallographic information is available from OCA.

Reference

A new modified thrombin binding aptamer containing a 5'-5' inversion of polarity site., Martino L, Virno A, Randazzo A, Virgilio A, Esposito V, Giancola C, Bucci M, Cirino G, Mayol L, Nucleic Acids Res. 2006;34(22):6653-62. Epub 2006 Dec 1. PMID:17145716 Page seeded by OCA on Sun May 4 07:22:35 2008