A general synthesis of specifically deuterated nucleotides for studies of DNA and RNA
作者:Bingzi Chen、Elizabeth R. Jamieson、Thomas D. Tullius
DOI:10.1016/s0960-894x(02)00650-9
日期:2002.11
ribonucleotides and deoxyribonucleotides with deuterium incorporated at the 1', 4', or 5' position. Three intermediates-[1-2H]-D-ribose, [4-2H]-D-ribose, and [5-2H(2)]-D-ribose-were prepared by chemical synthesis and subsequently converted to ribonucleotides and deoxyribonucleotides via enzymatic reactions. Milligram quantities of the desired products were obtained with an average deuterium content of 96+/-1%
Biosynthesis of the thiamin pyrimidine: the reconstitution of a remarkable rearrangement reaction
作者:Brian G. Lawhorn、Ryan A. Mehl、Tadhg P. Begley
DOI:10.1039/b405429f
日期:——
The conversion of 5-aminoimidazole ribonucleotide (AIR) into 4-amino-2-methyl-5-hydroxymethylpyrimidine (HMP) is a fascinating reaction on the thiamin biosynthetic pathway in bacteria and is probably the most complex unresolved rearrangement in primary metabolism. We have successfully reconstituted this reaction in a cell-free system. The E. coli thiC gene product and an additional unidentified E. coli protein are required for the reaction. In addition, SAM and nicotinamide cofactors are required for full activity. Labeling studies to determine the origin of most of the atoms in the pyrimidine are described. Based on these studies, a new mechanism for HMP formation is proposed.
A “Radical Dance” in Thiamin Biosynthesis: Mechanistic Analysis of the Bacterial Hydroxymethylpyrimidine Phosphate Synthase
作者:Abhishek Chatterjee、Amrita B. Hazra、Sameh Abdelwahed、David G. Hilmey、Tadhg P. Begley
DOI:10.1002/anie.201003419
日期:2010.11.8
Tricky things with ThiC: Hydroxymethylpyrimidinephosphate (HMP‐P) synthase (ThiC) catalyzes one of the most complex rearrangement reactions in primary metabolism. Deuteration experiments show that under reducing conditions, in the presence of aminoimidazole ribonucleotide, the 5′‐deoxyadenosyl radical generated at the active site of ThiC reacts directly with the substrate and performs two iterative
RNA
nucleosides are often naturally modified into complex non-canonical structures with key biological functions. Here we report LC-MS quantification of the Ar(p) and Gr(p) 2â²-ribosylated nucleosides in tRNA using deuterium labelled standards, and the first detection of Gr(p) in complex fungi.
Synthesis of Mixed Dinucleotides by Mechanochemistry
作者:Faisal Hayat、Mikhail V. Makarov、Luxene Belfleur、Marie E. Migaud
DOI:10.3390/molecules27103229
日期:——
We report the synthesis of vitamin B1, B2, and B3 derived nucleotides and dinucleotides generated either through mechanochemical or solution phase chemistry. Under the explored conditions, adenosine and thiamine proved to be particularly amenable to milling conditions. Following optimization of the chemistry related to the formation pyrophosphate bonds, mixed dinucleotides of adenine and thiamine (vitamin