A quantitative map of nuclear pore assembly reveals two distinct mechanisms.
Shotaro OtsukaJeremy O B TempkinWanlu ZhangAntonio Z PolitiArina RybinaM Julius HossainMoritz KueblbeckAndrea CallegariBirgit KochNatalia Rosalia MoreroAndrej SaliJan EllenbergPublished in: Nature (2023)
Understanding how the nuclear pore complex (NPC) is assembled is of fundamental importance to grasp the mechanisms behind its essential function and understand its role during the evolution of eukaryotes 1-4 . There are at least two NPC assembly pathways-one during the exit from mitosis and one during nuclear growth in interphase-but we currently lack a quantitative map of these events. Here we use fluorescence correlation spectroscopy calibrated live imaging of endogenously fluorescently tagged nucleoporins to map the changes in the composition and stoichiometry of seven major modules of the human NPC during its assembly in single dividing cells. This systematic quantitative map reveals that the two assembly pathways have distinct molecular mechanisms, in which the order of addition of two large structural components, the central ring complex and nuclear filaments are inverted. The dynamic stoichiometry data was integrated to create a spatiotemporal model of the NPC assembly pathway and predict the structures of postmitotic NPC assembly intermediates.
Keyphrases
- high resolution
- endothelial cells
- single molecule
- high density
- induced apoptosis
- electronic health record
- oxidative stress
- artificial intelligence
- big data
- cell cycle arrest
- quantum dots
- cell proliferation
- pluripotent stem cells
- endoplasmic reticulum stress
- cell death
- induced pluripotent stem cells
- fluorescence imaging