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Updated: Aug 12, 2025

Evaluation of Substrate Ubiquitylation by E3 Ubiquitin-ligase in Mammalian Cell Lysates
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Network regulation meets substrate modification chemistry.

Vaidhiswaran Ramesh1, Thapanar Suwanmajo1,2,3, J Krishnan1,4

  • 1Department of Chemical Engineering, Sargent Centre for Process Systems Engineering, Imperial College London, London SW7 2AZ, UK.

Journal of the Royal Society, Interface
|February 1, 2023
PubMed
Summary
This summary is machine-generated.

Cellular information processing involves network regulation and substrate modification. Integrating these reveals emergent behaviors, preventing misleading conclusions from single-level analysis.

Keywords:
multi-level networksmultisite modificationnegative and positive feedbacknetwork regulationprotein sequestrationsignalling networksubstrate modification‌

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Area of Science:

  • Biochemistry
  • Systems Biology
  • Cellular Signaling

Background:

  • Biochemical networks are crucial for cellular information processing, involving environmental signal transduction and substrate modification.
  • Existing research often analyzes network regulation and substrate modification independently, neglecting their interactions and impact on cellular systems behavior.

Purpose of the Study:

  • To develop a systems framework for understanding the interplay between network regulation and substrate modification in biochemical networks.
  • To investigate how feedback/feed-forward circuits and multisite protein modification interact and influence emergent cellular behaviors.

Main Methods:

  • Utilized computational, analytical, and semi-analytical approaches to model and analyze biochemical network dynamics.
  • Examined the combined effects of canonical network regulation (feedback, feed-forward) and multisite substrate modification.

Main Results:

  • Revealed distinct and unexpected interactions between substrate modification and network regulation levels.
  • Demonstrated emergent behaviors arising from the integration of these two facets of biochemical networks.
  • Showcased how focusing on only one level can lead to misleading conclusions about system behavior.

Conclusions:

  • The interplay between network regulation and substrate modification is critical for accurate understanding of cellular systems.
  • This integrated framework has significant implications for dissecting signaling networks, inferring network structures, and engineering biomolecular systems.
  • Highlights the necessity of multi-level analysis for experimental, theoretical, and data-driven studies of cellular signaling.