Assigning functionality to cysteines by base editing of cancer dependency genes

Nature Chemical Biology, Published online: 02 October 2023; doi:10.1038/s41589-023-01428-w

Determining which covalent binding events impact protein function is challenging. Now, a strategy has been reported that integrates base editing and chemical proteomics to infer the functionality of ligandable cysteines in cancer dependency proteins by quantifying the impact of their missense mutation on cancer cell proliferation.

Sentinel cells programmed to respond to environmental DNA including human sequences

Nature Chemical Biology, Published online: 28 September 2023; doi:10.1038/s41589-023-01431-1

Nou et al. engineered Bacillus subtilis cells into a living sentinel system, which can take up environmental DNA and fluoresce when a matching sequence is detected. This system enables recording of SNPs for facial features and has broad applications spanning forensics to agriculture.

Directed evolution unlocks oxygen reactivity for a nicotine-degrading flavoenzyme

Nature Chemical Biology, Published online: 28 September 2023; doi:10.1038/s41589-023-01426-y

The flavoenzyme nicotine oxidoreductase degrades nicotine in the bloodstream. Now, genetic selection in bacteria has been used to improve the catalytic performance of nicotine oxidoreductase, isolating variants with increased O2 reactivity that were more effective at degrading nicotine in the blood of rats.