A 500 MHz proton NMR study of stacking interactions: Binding of tripeptide Lys‐Tyr‐Lys to tetradeoxynucleotide d‐GpCpGpC
作者:
R. Barthwal,
A. Mujeeb,
S. Kukreti,
A. Gupta,
G. Govil,
期刊:
Journal of Molecular Recognition
(WILEY Available online 1991)
卷期:
Volume 4,
issue 2‐3
页码: 45-52
ISSN:0952-3499
年代: 1991
DOI:10.1002/jmr.300040202
出版商: John Wiley&Sons, Ltd.
数据来源: WILEY
摘要:
AbstractThe complete sequential assignment and conformation of d‐GpCpGpC in D2O has been determined from ID NMR spectra at 285–320 K and room temperature 2D‐COSY and NOESY spectra. The tetradeoxynucleotide exists primarily as a right handed double helix at 285 K, havingTmas 314 K. On binding to a tripeptide Lys‐Tyr‐Lys in a concentration equimolar to tetranucleotide duplex, the Tyr ring protons shift uplifted by 0.14 ppm at 285 K. The increase inTmon binding suggests stabilization of duplex. The existence of intermolecular NOEs between C4 sugar protons and TyrαC and LysαC protons give direct evidence of proximity of Tyr residue to the C4 base of d‐GpCpGpC. The conformation of d‐GpCpGpC remains unchanged on binding. The observed results are interpreted in terms of preferential stacking of aromatic ring of Tyr residue with proximal base‐pair of d‐GpCpGpC, stabilized by electostatic interaction of Lysine side chains with backbone phosphates. This is in contrast to intercalculation of aromatic dyes within base‐pairs resulting in a change in sugar conformatio
点击下载:
PDF
(599KB)
返 回