Structural basis of Gabija anti-phage defence and viral immune evasion

Sadie P. Antine, Alex G. Johnson, Sarah E. Mooney, Azita Leavitt, Megan L. Mayer, Erez Yirmiya, Gil Amitai, Rotem Sorek and Philip J. Kranzusch ()
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Sadie P. Antine: Harvard Medical School
Alex G. Johnson: Harvard Medical School
Sarah E. Mooney: Harvard Medical School
Azita Leavitt: Weizmann Institute of Science
Megan L. Mayer: Harvard Medical School
Erez Yirmiya: Weizmann Institute of Science
Gil Amitai: Weizmann Institute of Science
Rotem Sorek: Weizmann Institute of Science
Philip J. Kranzusch: Harvard Medical School

Nature, 2024, vol. 625, issue 7994, 360-365

Abstract: Abstract Bacteria encode hundreds of diverse defence systems that protect them from viral infection and inhibit phage propagation1–5. Gabija is one of the most prevalent anti-phage defence systems, occurring in more than 15% of all sequenced bacterial and archaeal genomes1,6,7, but the molecular basis of how Gabija defends cells from viral infection remains poorly understood. Here we use X-ray crystallography and cryo-electron microscopy (cryo-EM) to define how Gabija proteins assemble into a supramolecular complex of around 500 kDa that degrades phage DNA. Gabija protein A (GajA) is a DNA endonuclease that tetramerizes to form the core of the anti-phage defence complex. Two sets of Gabija protein B (GajB) dimers dock at opposite sides of the complex and create a 4:4 GajA–GajB assembly (hereafter, GajAB) that is essential for phage resistance in vivo. We show that a phage-encoded protein, Gabija anti-defence 1 (Gad1), directly binds to the Gabija GajAB complex and inactivates defence. A cryo-EM structure of the virally inhibited state shows that Gad1 forms an octameric web that encases the GajAB complex and inhibits DNA recognition and cleavage. Our results reveal the structural basis of assembly of the Gabija anti-phage defence complex and define a unique mechanism of viral immune evasion.

Date: 2024
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DOI: 10.1038/s41586-023-06855-2

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