ジャーナル: Sci Adv / 年: 2025 タイトル: In situ structure of a gap junction-stomatin complex. 著者: Nils Rosenkranz / Alexandra N Birtasu / Konstantin Wieland / Lisa Rehm / Rachita Sharma / Atal Vats / Sina Manger / Aayush Srivastava / Abhishek Bhattacharya / Gerhard Hummer / Achilleas S ...著者: Nils Rosenkranz / Alexandra N Birtasu / Konstantin Wieland / Lisa Rehm / Rachita Sharma / Atal Vats / Sina Manger / Aayush Srivastava / Abhishek Bhattacharya / Gerhard Hummer / Achilleas S Frangakis / Alexander Gottschalk / 要旨: Gap junctions (GJs) are intercellular channels that mediate electrical signals and transfer of small molecules. They are crucial for brain, heart, and other organ functions. While molecular ...Gap junctions (GJs) are intercellular channels that mediate electrical signals and transfer of small molecules. They are crucial for brain, heart, and other organ functions. While molecular structures of purified homomeric GJs are available, information of in situ structures is lacking. In vivo, GJs can form heteromers with different functionalities and may associate with other proteins. Here, we analyzed GJs by cryo-electron tomography and subtomogram averaging. We observed hexagonal arrays of GJs at cellular junctions in primary embryonal cells that displayed distinct wide and narrow conformations. Moreover, we found a cap-like, cytosolic protein assembly enclosing the channel pore. We propose that the cap is formed by the stomatin UNC-1, known to interact with UNC-9 innexins. This is corroborated by matching AlphaFold3 models of UNC-1 multimers with our subtomogram average structure; by expressing GFP-tagged UNC-1, leading to cap structures with additional density; and by coarse-grained MD simulations. UNC-1/stomatin rings may affect GJ formation or functions, possibly beyond nematodes.