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Published on: June 15, 2017
Load-induced modulation of signal transduction networks
Peng Jiang1, Alejandra C Ventura, Eduardo D Sontag
1Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109-0606, USA.
Science Signaling
|October 13, 2011
Summary
Biological signaling networks exhibit load-induced modulation, where downstream targets influence signal response dynamics. This reverse-causality affects response times and information processing bandwidth in biological circuits.
Area of Science:
- Systems biology
- Biophysics
- Molecular biology
Background:
- Biological signal transduction networks are typically modeled as circuits processing information.
- These networks amplify signals, enhance sensitivity, and perform other signal-processing tasks.
Purpose of the Study:
- To investigate the phenomenon of load-induced modulation in biological signal transduction.
- To understand how downstream targets affect signaling dynamics.
Main Methods:
- Utilized a combination of analytical and experimental tools.
- Investigated a covalent modification cycle under varying load conditions.
Main Results:
- Discovered that downstream targets (load) modulate signal transduction in a reverse-causality manner.
- Observed non-intuitive changes in response dynamics, including altered response times in 'limit' and 'intermediate' regimes.
- Found that network bandwidth decreased with load, impacting high-frequency signal processing.
Conclusions:
- Downstream targets are not passive relays but actively modulate signaling pathways.
- Load-induced modulation reveals a balance between noise filtering and high-frequency information processing in biological circuits.
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