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April 2025

Research on bacteriophages, the viruses infecting bacteria, has fueled the development of modern molecular biology and inspired their therapeutic application to combat bacterial multidrug resistance. However, most work has so far focused on a few model phages which impedes direct applications of these findings in clinics and suggests that a vast potential of powerful molecular biology has remained untapped. Humolli, Piel et al. have therefore recently compiled the BASEL collection of Escherichia coli phages (BActeriophage SElection for your Laboratory), which made a relevant diversity of phages infecting the E. coli K-12 laboratory strain accessible to the community. These phages are widely used, but their assorted diversity has remained limited by the E. coli K-12 host. The authors have therefore now genetically overcome the two major limitations of E. coli K-12, namely its lack of O-antigen glycans and the presence of resident bacterial immunity. Restoring O-antigen expression resulted in the isolation of diverse additional viral groups like Kagunavirus, Nonanavirus, Gordonclarkvirinae, and Gamaleyavirus, while eliminating all known antiviral defenses of E. coli K-12 additionally enabled the isolation of phages of the Wifcevirus genus. Even though some of these viral groups appear to be common in nature, no phages from any of them had previously been isolated using E. coli laboratory strains, and they had thus remained largely understudied. Overall, 37 new phage isolates have been added to complete the BASEL collection. The image shows four of these phages superimposed on a map of central Basel.

Image Credit: Fabienne Estermann

Unsolved Mystery

Primers

Research Articles

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Polarized subcellular activation of Rho proteins by specific ROPGEFs drives pollen germination in Arabidopsis thaliana

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Phase separation of the PRPP amidotransferase into dynamic condensates promotes de novo purine synthesis in yeast

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Variant mutation G215C in SARS-CoV-2 nucleocapsid enhances viral infection via altered genomic encapsidation

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Interferon regulatory factor 4 mediates nonenzymatic IRE1 dependency in multiple myeloma cells

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Vps34-orchestrated lipid signaling processes regulate the transitional heterogeneity and functional adaptation of effector regulatory T cells

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Structure of the scaffolding protein and portal within the bacteriophage P22 procapsid provides insights into the self-assembly process

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