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Enzymatic synthesis of cyclic dinucleotide analogs by a promiscuous cyclic-AMP-GMP synthetase and analysis of cyclic dinucleotide responsive riboswitches.
Nucleic Acids Research 2018 April 7
Cyclic dinucleotides are second messenger molecules produced by both prokaryotes and eukaryotes in response to external stimuli. In bacteria, these molecules bind to RNA riboswitches and several protein receptors ultimately leading to phenotypic changes such as biofilm formation, ion transport and secretion of virulence factors. Some cyclic dinucleotide analogs bind differentially to biological receptors and can therefore be used to better understand cyclic dinucleotide mechanisms in vitro and in vivo. However, production of some of these analogs involves lengthy, multistep syntheses. Here, we describe a new, simple method for enzymatic synthesis of several 3', 5' linked cyclic dinucleotide analogs of c-di-GMP, c-di-AMP and c-AMP-GMP using the cyclic-AMP-GMP synthetase, DncV. The enzymatic reaction efficiently produced most cyclic dinucleotide analogs, such as 2'-amino sugar substitutions and phosphorothioate backbone modifications, for all three types of cyclic dinucleotides without the use of protecting groups or organic solvents. We used these novel analogs to explore differences in phosphate backbone and 2'-hydroxyl recognition between GEMM-I and GEMM-Ib riboswitches.
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