PAM forms an atypical SCF ubiquitin ligase complex that ubiquitinates and degrades NMNAT2

The Journal of Biological Chemistry
Muriel DesboisBrock Grill

Abstract

PHR (PAM/Highwire/RPM-1) proteins are conserved RING E3 ubiquitin ligases that function in developmental processes, such as axon termination and synapse formation, as well as axon degeneration. At present, our understanding of how PHR proteins form ubiquitin ligase complexes remains incomplete. Although genetic studies indicate NMNAT2 is an important mediator of PHR protein function in axon degeneration, it remains unknown how PHR proteins inhibit NMNAT2. Here, we decipher the biochemical basis for how the human PHR protein PAM, also called MYCBP2, forms a noncanonical Skp/Cullin/F-box (SCF) complex that contains the F-box protein FBXO45 and SKP1 but lacks CUL1. We show FBXO45 does not simply function in substrate recognition but is important for assembly of the PAM/FBXO45/SKP1 complex. Interestingly, we demonstrate a novel role for SKP1 as an auxiliary component of the target recognition module that enhances binding of FBXO45 to NMNAT2. Finally, we provide biochemical evidence that PAM polyubiquitinates NMNAT2 and regulates NMNAT2 protein stability and degradation by the proteasome.

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Citations

Oct 22, 2019·Current Opinion in Neurology·Vassilis E Koliatsos, Athanasios S Alexandris
Aug 29, 2019·Open Biology·Arnau Llobet Rosell, Lukas J Neukomm
Apr 28, 2020·Neural Development·Andrew C Giles, Brock Grill
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Jul 14, 2020·Cell Death Discovery·Min LinXueqiong Zhu
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Jan 13, 2021·Cell Death and Differentiation·Luke M HumphreysVincenzo D'Angiolella
Feb 11, 2021·Cell Death Discovery·Min LinXueqiong Zhu

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