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Defining Single Molecular Forces Required for Notch Activation Using Nano Yoyo
Farhan Chowdhury1,2,3, Isaac T S Li2,4, Thuy T M Ngo2
1Department of Mechanical Engineering and Energy Processes, Southern Illinois University Carbondale , Carbondale, Illinois 62901, United States.
Nano Letters
|May 12, 2016
Summary
This study reveals the precise forces needed for Notch signaling activation. Using a novel nano-yoyo tool, researchers found that Notch activation requires 4–12 pN of force, linking molecular mechanics to cellular processes.
Area of Science:
- Biophysics
- Cell Biology
- Molecular Mechanics
Background:
- Notch signaling regulates development and tissue homeostasis.
- Mechanical forces are known to influence Notch receptor activation.
- Previous methods lacked the precision to measure single-molecule forces for Notch activation.
Purpose of the Study:
- To determine the single molecular force threshold for Notch receptor activation.
- To develop and utilize a novel low tension gauge tether (LTGT) for precise force measurements.
- To establish a direct link between mechanical forces and Notch signaling.
Main Methods:
- Development of a novel low tension gauge tether (LTGT) using single-stranded DNA (ssDNA) and Escherichia coli ssDNA binding protein (SSB).
- Utilizing the known low unbinding force of ssDNA from SSB (approx. 4 pN) as a force sensor.
- Combining LTGTs with previously established tension gauge tethers (TGTs) to measure forces in the 4–12 pN range.
- Assessing Notch receptor activation under defined force loading rates (60 pN/s).
Main Results:
- The novel LTGT system successfully measured single-molecular forces.
- Notch activation was demonstrated to require forces between 4 and 12 pN.
- The study provides direct evidence for force-dependent Notch activation.
Conclusions:
- Single-molecular force measurements are crucial for understanding Notch signaling.
- The developed LTGT is a valuable tool for probing mechanotransduction.
- This work elucidates the mechanical requirements for activating a key developmental signaling pathway.
