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Sigel, R K O; Thompson, S M; Freisinger, E; Glahé, F; Lippert, B (2001). Metal-modified nucleobase sextet: joining four linear metal fragments (trans-a2PtII) and six model nucleobases to an exceedingly stable entity. Chemistry - A European Journal, 7(9):1968-1980.

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Abstract

Crosslinking of three different model nucleobases (9-ethyladenine, 9-EtA; 9-ethylguanine, 9-EtGH; 1-methyluracil, 1-MeU) by two linear trans-aPtII (a = NH3 or CH3NH2) entities leads to a flat metal-modified base triplet, trans,trans-[(NH3)2Pt(1-MeU-N3)(mu-9-EtA-N7,N1)Pt(CH3NH2)2(9-EtGH-N7)]3+ (4b). Upon hemideprotonation of the 9-ethylguanine base at the N1 position. 4b spontaneously dimerizes to the metalated nucleobase sextet 5, [(4b)(triple bond)(4b-H)]5+. In this dimeric structure a neutral and an anionic guanine ligand, which are complementary to each other, are joined through three H bonds and additionally by two H bonds between guanine and uracil nucleobases. Four additional interbase H bonds maintain the approximate coplanarity of all six bases. The two base triplets form an exceedingly stable entity (KD = 500 +/- 150 M(-1) in DMSO), which is unprecedented in nucleobase chemistry. The precursor of 4b and several related complexes are described and their structures and solution properties are reported.

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Additional indexing

Item Type:Journal Article, refereed
Communities & Collections:07 Faculty of Science > Department of Chemistry
DDC:540 Chemistry
Language:English
Date:4 May 2001
Deposited On:11 Feb 2008 12:25
Last Modified:28 Nov 2013 00:42
Publisher:Wiley-Blackwell
ISSN:0947-6539
Publisher DOI:10.1002/1521-3765(20010504)7:9<1968::AID-CHEM1968>3.0.CO;2-B
Related URLs:http://www3.interscience.wiley.com/cgi-bin/abstract/80002096/ABSTRACT
PubMed ID:11405476

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