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Quantitative interaction mapping reveals an extended UBX domain in ASPL that disrupts functional p97 hexamers

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Item Type:Article
Title:Quantitative interaction mapping reveals an extended UBX domain in ASPL that disrupts functional p97 hexamers
Creators Name:Arumughan, A., Roske, Y., Barth, C., Lleras Forero, L., Bravo-Rodriguez, K., Redel, Al., Kostova, S., McShane, E., Opitz, R., Faelber, K., Rau, K., Mielke, T., Daumke, O., Selbach, M., Sanchez-Garcia, E., Rocks, O., Panáková, D., Heinemann, U. and Wanker, E.E.
Abstract:Interaction mapping is a powerful strategy to elucidate the biological function of protein assemblies and their regulators. Here, we report the generation of a quantitative interaction network, directly linking 14 human proteins to the AAA+ ATPase p97, an essential hexameric protein with multiple cellular functions. We show that the high-affinity interacting protein ASPL efficiently promotes p97 hexamer disassembly, resulting in the formation of stable p97:ASPL heterotetramers. High-resolution structural and biochemical studies indicate that an extended UBX domain (eUBX) in ASPL is critical for p97 hexamer disassembly and facilitates the assembly of p97:ASPL heterotetramers. This spontaneous process is accompanied by a reorientation of the D2 ATPase domain in p97 and a loss of its activity. Finally, we demonstrate that overproduction of ASPL disrupts p97 hexamer function in ERAD and that engineered eUBX polypeptides can induce cell death, providing a rationale for developing anti-cancer polypeptide inhibitors that may target p97 activity.
Keywords:Brain, Cell Proliferation, X-Ray, Crystallography, Endoplasmic Reticulum-Associated Degradation, HEK293 Cells, Mutation, Fusion, Oncogene Proteins, Peptides, Protein Binding, Protein Domains, Protein Engineering, Protein Interaction Maps, Protein Multimerization, Quaternary, Protein Structure, Recombinant Proteins, Valosin Containing Protein
Source:Nature Communications
ISSN:2041-1723
Publisher:Nature Publishing Group
Volume:7
Page Range:13047
Date:20 October 2016
Official Publication:https://doi.org/10.1038/ncomms13047
PubMed:View item in PubMed

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