Phage proteases activate CBASS antiphage immunity · S. J. Hobbs and P. J. Kranzusch
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Samuel J. Hobbs1,2*†, Philip J. Kranzusch1,2,3* cyclic oligonucleotide–based antiphage signaling systems (cbASS) are bacterial immune pathways evolutionarily related to cGAS- StING (cyclic GMP- AMP synthase–stimulator of interferon genes) in humans. In cbASS, cGAS/DncV- like nucleotidyltransferase (cD- Ntase) enzymes sense phage infection and synthesize nucleotide signals to initiate antiviral defense. Here, we reveal phage prohead protease activity as a widespread mechanism of cD- Ntase activation. We reconstitute cbASS recognition of phage t4 in vitro and identify proteolytic cleavage of a cD- Ntase activation loop as a trigger of immune signal synthesis. Phage prohead proteases directly activate cbASS in vivo, explaining how immunity is initiated late during infection. …
摘自《科学》(Science)2026年10月1日,S. J. Hobbs and P. J. Kranzusch。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。