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TitleStructural analysis of a symbiotic system involving a Nanobdellati archaeon by cryo-electron tomography.
Journal, issue, pagesJ Biochem, Year 2025
Publish dateAug 26, 2025
AuthorsSakurako Goto-Ito / Shingo Kato / Mari Takahashi / Ayako Sakamoto / Atsushi Yamagata / Yongchan Lee / Haruhiko Ehara / Mayuko Sato / Kiminori Toyooka / Moriya Ohkuma / Takuhiro Ito /
PubMed AbstractNanobdellati (formerly DPANN) archaea are considered as primitive archaeal organisms that often live in symbiosis with archaeal hosts. In this study, we investigated the symbiotic mechanism between a ...Nanobdellati (formerly DPANN) archaea are considered as primitive archaeal organisms that often live in symbiosis with archaeal hosts. In this study, we investigated the symbiotic mechanism between a Nanobdellati archaeon, Nanobdella aerobiophila strain MJ1, and its host archaeon Metallosphaera sedula strain MJ1HA, using cryo-electron tomography. In our tomographic observations, we identified a conical attachment organelle at the interface between MJ1 and MJ1HA during symbiosis. This structure consists of a concentric array of short cylindrical shells, consistent with a previous report. Subtomogram averaging, combined with AlphaFold 3 structural predictions, allowed us to identify a potential component of attachment organelles. Additionally, we inferred potential components of the S-layers in MJ1 and MJ1HA based on tomographic data and subtomogram averages. Based on these analyses, we hypothesize that a MJ1 S-layer component may undergo conformational changes to also serve as a component of attachment organelles, warranting further investigation.
External linksJ Biochem / PubMed:40855682
MethodsEM (subtomogram averaging)
Resolution15.0 - 22.3 Å
Structure data

EMDB-65631: Subtomogram average of MJ1HA S-layer
Method: EM (subtomogram averaging) / Resolution: 15.0 Å

EMDB-65632: Subtomogram average of MJ1 attachment organelle
Method: EM (subtomogram averaging) / Resolution: 22.3 Å

Source
  • Metallosphaera sedula (archaea)
  • Nanobdella aerobiophila (archaea)

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