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Updated: Jul 20, 2026

A High-Throughput Enzyme-Coupled Activity Assay to Probe Small Molecule Interaction with the dNTPase SAMHD1
Published on: April 16, 2021
Molecular determinants of dihydrouridine synthase activity
Dan F Savage1, Valérie de Crécy-Lagard, Anthony C Bishop
1Department of Chemistry, Amherst College, MA 01002, USA.
Abstract:
Dihydrouridine is one of the most abundant modified bases in tRNA. However, little is known concerning the biochemistry of dihydrouridine synthase (DUS) enzymes. To identify molecular determinants that are necessary for DUS activity, we have developed a DUS-complementation assay in Escherichia coli. Using this assay, we have identified amino-acid residues that are critical for the activity of YjbN, an E. coli DUS. We also show that the aq1598 gene product, a putative DUS from Aquifex aeolicus, catalyzes dihydrouridine formation, providing the first biochemical demonstration that A. aeolicus encodes an active DUS.
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