Journal: J Biol Chem / Year: 2014 Title: The p97-FAF1 protein complex reveals a common mode of p97 adaptor binding. Authors: Caroline A Ewens / Silvia Panico / Patrik Kloppsteck / Ciaran McKeown / Ima-Obong Ebong / Carol Robinson / Xiaodong Zhang / Paul S Freemont / Abstract: p97, also known as valosin-containing protein, is a versatile participant in the ubiquitin-proteasome system. p97 interacts with a large network of adaptor proteins to process ubiquitylated ...p97, also known as valosin-containing protein, is a versatile participant in the ubiquitin-proteasome system. p97 interacts with a large network of adaptor proteins to process ubiquitylated substrates in different cellular pathways, including endoplasmic reticulum-associated degradation and transcription factor activation. p97 and its adaptor Fas-associated factor-1 (FAF1) both have roles in the ubiquitin-proteasome system during NF-κB activation, although the mechanisms are unknown. FAF1 itself also has emerging roles in other cell-cycle pathways and displays altered expression levels in various cancer cell lines. We have performed a detailed study the p97-FAF1 interaction. We show that FAF1 binds p97 stably and in a stoichiometry of 3 to 6. Cryo-EM analysis of p97-FAF1 yielded a 17 Å reconstruction of the complex with FAF1 above the p97 ring. Characteristics of p97-FAF1 uncovered in this study reveal common features in the interactions of p97, providing mechanistic insight into how p97 mediates diverse functionalities.
History
Deposition
Feb 23, 2013
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Header (metadata) release
Mar 13, 2013
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Map release
Mar 12, 2014
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Update
May 7, 2014
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Current status
May 7, 2014
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 120 K / Instrument: FEI VITROBOT MARK IV / Method: 3sec blot, 0sec drain
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Electron microscopy
Microscope
FEI/PHILIPS CM200FEG
Temperature
Min: 94 K / Max: 104 K / Average: 94 K
Alignment procedure
Legacy - Astigmatism: Objective lens astigmatism was corrected at 100,000 times magnification
Date
Dec 20, 2011
Image recording
Category: CCD / Film or detector model: GENERIC TVIPS / Digitization - Sampling interval: 1.76 µm / Number real images: 281 / Average electron dose: 10 e/Å2 / Bits/pixel: 16
Electron beam
Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
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