Download MendeleyTIR-like NADases act in bacterial immunity and the RNA vault.
Osinski, A., Mayro, B., Lopez, V.A., Schrad, J., Choi, H., Tomchick, D.R., Pawlowski, K., Forsberg, K., Shahmoradian, S.H., Tagliabracci, V.S.(2026) bioRxiv
- PubMed: 42146377 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.64898/2026.05.01.722283
- Primary Citation Related Structures:
10WC, 11CQ, 11CV, 11DR, 11DV, 11EE, 11EQ, 11FH, 11GZ, 11JB, 11JC, 11JD, 11JF - PubMed Abstract:
Across all domains of life, organisms exploit NAD + metabolism as a central line of defense against invading pathogens. Here, we show that domain of unknown function 4062 (DUF4062) is a widespread family of TIR-like NADases that hydrolyze NAD + to ADP-ribose and nicotinamide. In bacteria, DUF4062 homologs form a previously unrecognized antiphage defense system, which we name Swarożyc, that assembles with the phage portal into a supramolecular NADase complex to induce abortive infection. In eukaryotes, DUF4062 is found in TEP1, which we demonstrate functions as an active NADase within the RNA vault, an enigmatic organelle-like structure. Single-particle cryo-electron microscopy reveals ADP-ribose bound within the shoulder of both reconstituted and human brain vaults, while cryo-electron tomography positions TEP1 along the central axis at the shoulder. Thus, TEP1, like bacterial Swarożyc, functions by depleting NAD + , providing new insight into the long-standing mystery of vault function.
