Related Experiment Video
Updated: Mar 17, 2026
09:40
Analysis of the c-KIT Ligand Promoter Using Chromatin Immunoprecipitation
Published on: June 27, 2017
8.3K
Transition path theory analysis of c-Src kinase activation.
Yilin Meng1, Diwakar Shukla2, Vijay S Pande2
1Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL 60637;
Summary
Markov state models and transition path theory reveal the complex activation pathway of Src family kinases. This approach effectively models conformational transitions in biomolecular systems, highlighting crucial intermediate states.
Area of Science:
- Biochemistry
- Computational Biology
- Structural Biology
Background:
- Nonreceptor tyrosine kinases (Src family) are critical regulators of cellular signaling.
- Previous work established a Markov state model (MSM) for c-Src catalytic domain activation kinetics.
- MSM predictions aligned with experimental data for long-time transition kinetics.
Purpose of the Study:
- To apply transition path theory (TPT) to an existing MSM.
- To characterize the key features of the c-Src activation pathway.
- To elucidate the conformational dynamics governing kinase activation.
Main Methods:
- Utilized a previously constructed Markov state model (MSM).
- Applied transition path theory (TPT) to analyze the MSM.
- Investigated conformational subspace and transition flux.
Main Results:
- Identified a dense set of intermediate microstates forming a 'transition tube'.
- Observed that the activation loop opens, followed by αC-helix rotation.
- Found that low-probability microstates contribute significantly to transition flux.
Conclusions:
- The combination of MSM and TPT offers an effective framework for studying biomolecular conformational transitions.
- Extensive conformational sampling is vital for accurate kinetic determination.
- The study provides insights into the allosteric regulation of tyrosine kinases.
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