Cited by 52Gene Regulatory Network AnalysisBioinformatics and Genomic NetworksProtein Kinase Regulation and GTPase Signaling

Machines vs. Ensembles: Effective MAPK Signaling through Heterogeneous Sets of Protein Complexes

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Suderman, Ryan, Deeds, Eric J.·2013·PLoS Computational Biology

Abstract

Despite the importance of intracellular signaling networks, there is currently no consensus regarding the fundamental nature of the protein complexes such networks employ. One prominent view involves stable signaling machines with well-defined quaternary structures. The combinatorial complexity of signaling networks has led to an opposing perspective, namely that signaling proceeds via heterogeneous pleiomorphic ensembles of transient complexes. Since many hypotheses regarding network function rely on how we conceptualize signaling complexes, resolving this issue is a central problem in systems biology. Unfortunately, direct experimental characterization of these complexes has proven technologically difficult, while combinatorial complexity has prevented traditional modeling methods from approaching this question. Here we employ rule-based modeling, a technique that overcomes these limitations, to construct a model of the yeast pheromone signaling network. We found that this model exhibits significant ensemble character while generating reliable responses that match experimental observations. To contrast the ensemble behavior, we constructed a model that employs hierarchical assembly pathways to produce scaffold-based signaling machines. We found that this machine model could not replicate the experimentally observed combinatorial inhibition that arises when the scaffold is overexpressed. This finding provides evidence against the hierarchical assembly of machines in the pheromone signaling network and suggests that machines and ensembles may serve distinct purposes in vivo. In some cases, e.g. core enzymatic activities like protein synthesis and degradation, machines assembled via hierarchical energy landscapes may provide functional stability for the cell. In other cases, such as signaling, ensembles may represent a form of weak linkage, facilitating variation and plasticity in network evolution. The capacity of ensembles to signal effectively will ultimately shape how we conceptualize the function, evolution and engineering of signaling networks.

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Authors
Suderman, R., & Deeds, E. J.
Affiliations
University of Kansas (US)
Corresponding author
Deeds, Eric J.
Venue
PLoS Computational Biology
Published
2013-10-10
Volume
9
Issue
10
Pages
e1003278
ISSN
  • 1553-734X (ISSN-L)
  • 1553-7358
OpenAlex
W2006466539
Cited by
52
References
62
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 3 · 2019: 8 · 2018: 6 · 2017: 12 · 2016: 8 · 2015: 4 · 2014: 3
FWCI
2.24
Type
journal article
Language
en
Open access
Locations
  • PLoS Computational Biology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • KU ScholarWorks (University of Kansas) (submittedVersion, cc-by)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene Regulatory Network Analysis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bioinformatics and Genomic Networks
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
MAPK signaling, protein complexes, rule-based models, scaffold proteins, hierarchical assembly, network plasticity
MeSH terms
Computer Simulation, Models, Biological, Pheromones, Saccharomyces cerevisiae, Least-Squares Analysis, MAP Kinase Signaling System, Saccharomyces cerevisiae Proteins, Intracellular Signaling Peptides and Proteins, Systems Biology

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