Synthesis and Some Spectroscopic Properties of Porphyrin Derivatives Connected with Nucleobases (Adenine, Thymine, Guanine and Cytosine) by Alkanamide Chains.
Several kinds of porphyrin derivatives covalently connected with adenine, thymine, guanine, cytosine or adenine-thymine pair in a stacking mode between the porphyrin and nucleobase moiety have been synthesized via amide formation reaction of (2-aminophenyl)porphyrin derivatives with nucleobase-alkanoic acids, and characterized by spectroscopic methods. In the 1H-NMR spectra of these nucleobase-porphyrins the proton signals of the nucleobase moieties appear at remarkably higher fields than those of the reference compounds (the corresponding nucleobase-alkanoates) which have no porphyrin moiety. The behaviors of the high field shifts, due to the diamagnetic ring current effect of the porphyrin ring, reflect the characteristic conformational features of these compounds in which the base moieties are located at the upper zone of the porphyrin ring. The Soret bands of the porphyrin in the electronic absorption spectra were markedly weaker in intensity compared with those of the reference compound which has no nucleobase moiety. Both the high-field shifts of the base protons and the hypochromic effects on the Soret band are larger in guanine and cytosine systems than those in adenine and thymine systems, respectively.Those results indicate greater affinity of guanine and cytosine for porphyrin in comparison with adenine and cytosine, respectively, and this conclusion is compatible with the reported electronic spectral properties of mixtures of polynucleotides and water-soluble porphyrin derivatives.
作者:Hisatome, Masao、Maruyama, Noriaki、Ikeda, Koichi、Yamakawa, Koji
DOI:——
日期:——
Synthesis of Lipophilic Guanine N-9 Derivatives: Membrane Anchoring of Nucleobases Tailored to Fatty Acid Vesicles
作者:Michael C. Wamberg、Pernille L. Pedersen、Philipp M. G. Löffler、Anders N. Albertsen、Sarah E. Maurer、Kent A. Nielsen、Pierre-Alain Monnard
DOI:10.1021/acs.bioconjchem.7b00228
日期:2017.7.19
membranes. We report the synthesis of five new guanine–N9 derivatives bearing alkyl chains with different attachment chemistries, exploiting a synthesis pathway that allows a flexible choice of hydrophobic anchor moiety. In this study, these guanine derivatives were functionalized with C10 chains for insertion into decanoic acid bilayer structures, in which both alkyl chain length and attachment chemistry
directly inhibit viral replication. Docking studies using the structure of the PB2 cap-binding domain suggested that 7-alkylguanine derivatives substituted at position N-9 and N-2 could be good candidates. Four series of 7,9-di- and 2,7,9-trialkyl guanine derivatives were synthesized and evaluated by an AlphaScreen assay in competition with a biotinylated cap analogue. Three synthesized compounds display