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1H-1H correlations across N-H...N hydrogen bonds in nucleic acids.

Abstract：

:In 2HJ(NN)-COSY experiments, which correlate protons with donor/acceptor nitrogens across Nd...HNa bonds, the receptor nitrogen needs to be assigned in order to unambiguously identify the hydrogen bond. For many situations this is a non-trivial task which is further complicated by poor dispersion of (Na,Nd) resonances. To address these problems, we present pulse sequences to obtain direct, internucleotide correlations between protons in uniformly 13C/15N labeled nucleic acids containing Nd...HNa hydrogen bonds. Specifically, the pulse sequence H2(N1N3)H3 correlates H2(A,omega1):H3(U,omega2) protons across Watson-CrickA-U and mismatched G.A base pairs, the sequences H5(N3N1)H1/H6(N3N1)H1 correlate H5(C,omega1)/H6(C,omega1):H1(G,omega2) protons across Watson-Crick G-C base pairs, and the H2(N2N7)H8 sequence correlates NH2(G,A,C;omega1):H8(G,A;omega2) protons across G.G, A.A, sheared G.A and other mismatch pairs. These 1H-1H connectivities circumvent the need for independent assignment of the donor/acceptor nitrogen and related degeneracy issues associated with poorly dispersed nitrogen resonances. The methodology is demonstrated on uniformly 13C/15N labeled samples of (a) an RNA regulatory element involving the HIV-1 TAR RNA fragment, (b) a multi-stranded DNA architecture involving a G.(C-A) triad-containing G-quadruplex and (c) a peptide-RNA complex involving an evolved peptide bound to the HIV-1 Rev response element (RRE) RNA fragment.

journal_name

J Biomol NMR

journal_title

Journal of biomolecular NMR

authors

Majumdar A,Gosser Y,Patel DJ

doi

10.1023/a:1013340227140

subject

Has Abstract

pub_date

2001-12-01 00:00:00

pages

289-306

issue

4

eissn

0925-2738

issn

1573-5001

journal_volume

21

pub_type

杂志文章

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