Ubiquitin chain specific auto-ubiquitination triggers sustained oscillation, bistable switches and excitable firing

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Title: Ubiquitin chain specific auto-ubiquitination triggers sustained oscillation, bistable switches and excitable firing
Authors: Nguyen, Lan K.
Zhao, Qi
Varusai, Thawfeek M.
Kholodenko, Boris N.
Permanent link: http://hdl.handle.net/10197/9788
Date: Dec-2014
Online since: 2019-04-03T09:46:23Z
Abstract: Ubiquitin modification of cellular proteins commonly targets them for proteosomal degradation, but can also convey non-proteolytic functions. Over the past years, advances in experimental approaches have helped uncover the extensive involvement of ubiquitination in protein regulation. However, our understanding of the dynamics of the ubiquitination-related networks have lagged behind. A common regulatory theme for many E3 ligases is the ability to self-catalyse their own ubiquitination without involving external E3 ligating enzymes. Here, the authors have explored computational models of both proteolytic and non-proteolytic auto-ubiquitination of E3 ligases and characterised the dynamic properties of these regulatory motifs. Remarkably, in both cases auto-ubiquitination coupled with multi-step de-ubiquitination process can bring about sustained oscillatory behaviour. In addition, the same basic wiring structures can trigger bistable switches of activity and excitable firing of the dynamic responses of the ubiquitinated E3 ligase. Bifurcation analysis allows one to derive parametric conditions that govern these dynamics. They also show that these complex non-linear behaviours persist for a more detailed mechanistic description that involves the E1 and E2 enzymes. Their work therefore provides new insights into the dynamic features of auto-ubiquitination in different cellular contexts.
Funding Details: European Commission - Seventh Framework Programme (FP7)
Science Foundation Ireland
Type of material: Journal Article
Publisher: Institution of Engineering and Technology
Volume: 8
Issue: 6
Start page: 282
End page: 292
Copyright (published version): 2015 the Authors
Keywords: UbiquitinProtein degradationProtein traffickingCell cycle progressionUbiquitin moleculeAuto-ubiquitination
DOI: 10.1049/iet-syb.2014.0024
Language: en
Status of Item: Peer reviewed
Appears in Collections:Conway Institute Research Collection
SBI Research Collection
Medicine Research Collection

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