Transmembrane domain interactions underlie NSG1 regulation of sortilin ectodomain shedding.

ABSTRACT: Sortilin is a single-pass transmembrane receptor involved in intracellular trafficking, neurotrophic signaling, and protein clearance pathways relevant to neurodegenerative disease. We recently identified the neuron-specific protein NSG1 as a selective modulator of sortilin function, promoting its ectodomain shedding via ADAM10. However, the molecular basis of this interaction remains unresolved. Here, we present a structural framework for NSG1-mediated regulation of sortilin shedding. Using mutagenesis, biochemical assays, and structural modeling, we mapped the interaction interface of NSG1 to the helical transmembrane domain (TMD) of sortilin. We show that NSG1 binds a specific interface within the sortilin TMD, modulating its susceptibility to ectodomain shedding. Mutational analysis re

SUBMITTER: Overby M 

PROVIDER: S-EPMC12603737 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature