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-Structure paper
| Title | An amphipathic helix in Brl1 is required for nuclear pore complex biogenesis in . |
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| Journal, issue, pages | Elife, Vol. 11, Year 2022 |
| Publish date | Aug 24, 2022 |
 Authors | Annemarie Kralt / Matthias Wojtynek / Jonas S Fischer / Arantxa Agote-Aran / Roberta Mancini / Elisa Dultz / Elad Noor / Federico Uliana / Marianna Tatarek-Nossol / Wolfram Antonin / Evgeny Onischenko / Ohad Medalia / Karsten Weis /     |
| PubMed Abstract | The nuclear pore complex (NPC) is the central portal for macromolecular exchange between the nucleus and cytoplasm. In all eukaryotes, NPCs assemble into an intact nuclear envelope (NE) during ...The nuclear pore complex (NPC) is the central portal for macromolecular exchange between the nucleus and cytoplasm. In all eukaryotes, NPCs assemble into an intact nuclear envelope (NE) during interphase, but the process of NPC biogenesis remains poorly characterized. Furthermore, little is known about how NPC assembly leads to the fusion of the outer and inner NE, and no factors have been identified that could trigger this event. Here, we characterize the transmembrane protein Brl1 as an NPC assembly factor required for NE fusion in budding yeast. Brl1 preferentially associates with NPC assembly intermediates and its depletion halts NPC biogenesis, leading to NE herniations that contain inner and outer ring nucleoporins but lack the cytoplasmic export platform. Furthermore, we identify an essential amphipathic helix in the luminal domain of Brl1 that mediates interactions with lipid bilayers. Mutations in this amphipathic helix lead to NPC assembly defects, and cryo-electron tomography analyses reveal multilayered herniations of the inner nuclear membrane with NPC-like structures at the neck, indicating a failure in NE fusion. Taken together, our results identify a role for Brl1 in NPC assembly and suggest a function of its amphipathic helix in mediating the fusion of the inner and outer nuclear membranes. |
 External links | Elife / PubMed:36000978 / PubMed Central |
| Methods | EM (tomography) |
| Structure data |  EMDB-14502: Cryo-tomogram of FIB-sectioned Brl1-depleted yeast cell  EMDB-14503: Cryo-tomogram of FIB-sectioned non-depleted Brl1 control cells  EMDB-14505: Cryo-tomogram of FIB-sectioned Brl1(I395D) overexpressing cells  EMDB-14506: Cryo-tomogram of a FIB-sectioned Brl1-overexpressing cell |
| Source |
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Saccharomyces cerevisiae (brewer's yeast)