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Insights into the modulation of bacterial NADase activity by phage proteins

Author

Listed:
  • Hang Yin

    (Tianjin Medical University
    Tianjin Medical University)

  • Xuzichao Li

    (Tianjin Medical University
    Tianjin Medical University)

  • Xiaoshen Wang

    (Tianjin Medical University
    Tianjin Medical University)

  • Chendi Zhang

    (Hubei University)

  • Jiaqi Gao

    (Tianjin Medical University
    Tianjin Medical University)

  • Guimei Yu

    (Tianjin Medical University)

  • Qiuqiu He

    (Tianjin Medical University
    Tianjin Medical University)

  • Jie Yang

    (Tianjin Medical University)

  • Xiang Liu

    (Nankai University)

  • Yong Wei

    (Chinese Academy of Sciences)

  • Zhuang Li

    (Hubei University)

  • Heng Zhang

    (Tianjin Medical University
    Tianjin Medical University)

Abstract

The Silent Information Regulator 2 (SIR2) protein is widely implicated in antiviral response by depleting the cellular metabolite NAD+. The defense-associated sirtuin 2 (DSR2) effector, a SIR2 domain-containing protein, protects bacteria from phage infection by depleting NAD+, while an anti-DSR2 protein (DSR anti-defense 1, DSAD1) is employed by some phages to evade this host defense. The NADase activity of DSR2 is unleashed by recognizing the phage tail tube protein (TTP). However, the activation and inhibition mechanisms of DSR2 are unclear. Here, we determine the cryo-EM structures of DSR2 in multiple states. DSR2 is arranged as a dimer of dimers, which is facilitated by the tetramerization of SIR2 domains. Moreover, the DSR2 assembly is essential for activating the NADase function. The activator TTP binding would trigger the opening of the catalytic pocket and the decoupling of the N-terminal SIR2 domain from the C-terminal domain (CTD) of DSR2. Importantly, we further show that the activation mechanism is conserved among other SIR2-dependent anti-phage systems. Interestingly, the inhibitor DSAD1 mimics TTP to trap DSR2, thus occupying the TTP-binding pocket and inhibiting the NADase function. Together, our results provide molecular insights into the regulatory mechanism of SIR2-dependent NAD+ depletion in antiviral immunity.

Suggested Citation

  • Hang Yin & Xuzichao Li & Xiaoshen Wang & Chendi Zhang & Jiaqi Gao & Guimei Yu & Qiuqiu He & Jie Yang & Xiang Liu & Yong Wei & Zhuang Li & Heng Zhang, 2024. "Insights into the modulation of bacterial NADase activity by phage proteins," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47030-z
    DOI: 10.1038/s41467-024-47030-z
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    References listed on IDEAS

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    Cited by:

    1. Ning Cui & Jun-Tao Zhang & Zhuolin Li & Xin-Yang Wei & Jie Wang & Ning Jia, 2024. "Tetramerization-dependent activation of the Sir2-associated short prokaryotic Argonaute immune system," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Ruiwen Wang & Qi Xu & Zhuoxi Wu & Jialu Li & Hao Guo & Tianzhui Liao & Yuan Shi & Ling Yuan & Haishan Gao & Rong Yang & Zhubing Shi & Faxiang Li, 2024. "The structural basis of the activation and inhibition of DSR2 NADase by phage proteins," Nature Communications, Nature, vol. 15(1), pages 1-12, December.

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