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Neuronal exocytosis is mediated by SNARE proteins, which assemble into a highly stable four-helical bundle in a process that is not well understood. Here, electron paramagnetic resonance spectroscopy was used to examine how the t-SNAREs syntaxin and SNAP25 assemble in the presence and absence of the regulatory protein Munc18-1. Syntaxin and SNAP25 form a 2:1 complex, which is structurally heterogeneous...
The ESCRT-I and ESCRT-II supercomplex induces membrane buds that invaginate into the lumen of endosomes, a process central to the lysosomal degradation of ubiquitinated membrane proteins. The solution conformation of the membrane-budding ESCRT-I-II supercomplex from yeast was refined against small-angle X-ray scattering (SAXS), single-molecule Förster resonance energy transfer (smFRET), and double...
Ndel1 and Nde1 are homologous and evolutionarily conserved proteins, with critical roles in cell division, neuronal migration, and other physiological phenomena. These functions are dependent on their interactions with the retrograde microtubule motor dynein and with its regulator Lis1—a product of the causal gene for isolated lissencephaly sequence (ILS) and Miller-Dieker lissencephaly. The molecular...
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