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NEMO reshapes the α-Synuclein aggregate interface and acts as an autophagy adapter by co-condensation with p62.


ABSTRACT: NEMO is a ubiquitin-binding protein which regulates canonical NF-κB pathway activation in innate immune signaling, cell death regulation and host-pathogen interactions. Here we identify an NF-κB-independent function of NEMO in proteostasis regulation by promoting autophagosomal clearance of protein aggregates. NEMO-deficient cells accumulate misfolded proteins upon proteotoxic stress and are vulnerable to proteostasis challenges. Moreover, a patient with a mutation in the NEMO-encoding IKBKG gene resulting in defective binding of NEMO to linear ubiquitin chains, developed a widespread mixed brain proteinopathy, including α-synuclein, tau and TDP-43 pathology. NEMO amplifies linear ubiquitylation at α-synuclein aggregates and promotes the local concentration of p62 into foci. In vitro, NEMO lowers the threshold concentrations required for ubiquitin-dependent phase transition of p62. In summary, NEMO reshapes the aggregate surface for efficient autophagosomal clearance by providing a mobile phase at the aggregate interphase favoring co-condensation with p62.

SUBMITTER: Furthmann N 

PROVIDER: S-EPMC10730909 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature

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NEMO reshapes the α-Synuclein aggregate interface and acts as an autophagy adapter by co-condensation with p62.

Furthmann Nikolas N   Bader Verian V   Angersbach Lena L   Blusch Alina A   Goel Simran S   Sánchez-Vicente Ana A   Krause Laura J LJ   Chaban Sarah A SA   Grover Prerna P   Trinkaus Victoria A VA   van Well Eva M EM   Jaugstetter Maximilian M   Tschulik Kristina K   Damgaard Rune Busk RB   Saft Carsten C   Ellrichmann Gisa G   Gold Ralf R   Koch Arend A   Englert Benjamin B   Westenberger Ana A   Klein Christine C   Jungbluth Lisa L   Sachse Carsten C   Behrends Christian C   Glatzel Markus M   Hartl F Ulrich FU   Nakamura Ken K   Christine Chadwick W CW   Huang Eric J EJ   Tatzelt Jörg J   Winklhofer Konstanze F KF  

Nature communications 20231219 1


NEMO is a ubiquitin-binding protein which regulates canonical NF-κB pathway activation in innate immune signaling, cell death regulation and host-pathogen interactions. Here we identify an NF-κB-independent function of NEMO in proteostasis regulation by promoting autophagosomal clearance of protein aggregates. NEMO-deficient cells accumulate misfolded proteins upon proteotoxic stress and are vulnerable to proteostasis challenges. Moreover, a patient with a mutation in the NEMO-encoding IKBKG gen  ...[more]

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