Related Experiment Video
Updated: May 19, 2026
11:13
Identification of Kinase-substrate Pairs Using High Throughput Screening
Published on: August 29, 2015
Protein kinases display minimal interpositional dependence on substrate sequence: potential implications for the
Brian A Joughin1, Chengcheng Liu, Douglas A Lauffenburger
1The David H. Koch Institute for Integrative Cancer Research, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
Summary
Analyzing kinase substrates reveals that sequence dependencies between positions are rare and offer little help in predicting new substrates. Future predictions require integrating biological context beyond just substrate sequences.
Area of Science:
- Biochemistry
- Molecular Biology
- Systems Biology
Background:
- Protein kinases play crucial roles in cellular signaling by phosphorylating substrates.
- Peptide library screening identifies kinase substrate specificity but misses positional interdependencies.
- High-throughput methods now enable large-scale identification of in vivo kinase substrates.
Purpose of the Study:
- To evaluate the prevalence of interpositional sequence dependencies in kinase motifs.
- To assess the utility of these dependencies in predicting kinase substrates.
- To determine the necessity of biological context for accurate kinase-substrate prediction.
Main Methods:
- Utilized experimental data for ATM/ATR, CDK1, and curated CK2 kinase substrates.
- Analyzed sequence data to identify and quantify interpositional interactions within substrate motifs.
- Developed and compared predictive models with and without consideration of positional dependencies.
Main Results:
- Evidence for interpositional sequence dependencies among kinase substrates is remarkably infrequent.
- Existing dependencies provide minimal improvement in predicting novel kinase substrates.
- Position-independent models are only marginally improved by incorporating sequence dependencies.
Conclusions:
- Predicting kinase-substrate specificity requires integrating biological and cellular context, not solely substrate sequences.
- Evolution of kinase substrate fitness may occur on a smooth energetic landscape.
- The evolution of binding suitability for phosphopeptide-binding domains might limit the integration of new substrates into signaling networks.
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