Measurement of the malondialdehyde–2′-deoxyguanosine adduct in human urine by immuno-extraction and liquid chromatography/atmospheric pressure chemical ionization tandem mass spectrometry
The reaction of malonaldehyde under acidic conditions (pH 4.5) with guanosine 5′-monophosphate resulted in the formation of fluorescent 3-(β-D-ribofuranosyl)pyrimido[1,2-a]purin-10(3H)-one 5′-phosphate (3a). This adduct was also isolated from malonaldehyde-reacted RNA. The amount of 3a in the modified RNA was estimated to be 0.4 per cent by weight. The fluorescence spectrum of 3a (Ex max. 360 nm, Em
“One-Pot” Syntheses of Malondialdehyde Adducts of Nucleosides
作者:Jozsef Szekely、Hao Wang、Katherine M. Peplowski、Charles G. Knutson、Lawrence J. Marnett、Carmelo J. Rizzo
DOI:10.1080/15257770701795797
日期:2008.1.18
Short, "one-pot" syntheses of malondialdehyde adducts of deoxyguanosine, deoxyadenosine, and deoxycytidine are described. These syntheses proceed in improved yield and easier purification than previous syntheses and are well suited for the preparation of isotopically labeled nucleoside adducts for biomarker and metabolic studies.
Addition of Deoxyribose to Guanine and Modified DNA Bases by <i>Lactobacillus helveticus</i> <i>trans</i>-<i>N</i>-Deoxyribosylase
作者:Michael Müller、Linda K. Hutchinson、F. Peter Guengerich
DOI:10.1021/tx9600661
日期:1996.1.1
trans-N-deoxyribosylase was evaluated as an alternative method for deoxyribosylation in the synthesis of deoxyribonucleosides containing potentially mutagenic adducts. A crude enzyme preparation was isolated from Lactobacillus helveticus and compared to Escherichia coli purinenucleoside phosphorylase. trans-N-deoxyribosylase was more regioselective than purinenucleoside phosphorylase in the deoxyribosylation of
Synthesis of Oligonucleotides Containing the Alkali-Labile Pyrimidopurinone Adduct, M<sub>1</sub>G
作者:Nathalie C. Schnetz-Boutaud、Hui Mao、Michael P. Stone、Lawrence J. Marnett
DOI:10.1021/tx990141i
日期:2000.2.1
An improved method for the synthesis of oligodeoxyribonucleotidescontaining the endogenous adduct, pyrimido[1,2-a]purin-10(3H)-one (M(1)G), is reported. The key features of the methodology include improved synthesis of the deoxynucleoside of M(1)G by transribosylation with deoxycytidine catalyzed by nucleoside 2'-deoxyribosyltransferase and the use of commercially available 4-tert-butylphenoxyacetyl
Chemical Properties of Oxopropenyl Adducts of Purine and Pyrimidine Nucleosides and Their Reactivity toward Amino Acid Cross-Link Formation
作者:Joseph Szekely、Carmelo J. Rizzo、Lawrence J. Marnett
DOI:10.1021/ja074506u
日期:2008.2.1
of 8.2. Cross-linking of 2, 4, 5, and 6 to N(alpha)-acetyl-lysine was explored at neutral pH. Adduct 2 did not react with N(alpha)-acetyl-lysine, whereas 4-6 readily formed cross-links. The structures of the cross-links were elucidated, and their stabilities were investigated. The results define the acidity of oxopropenyl deoxynucleosides and highlight its importance to their reactivitytoward nucleophiles