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Updated: Jun 8, 2026
Non-chromatographic Purification of Recombinant Elastin-like Polypeptides and their Fusions with Peptides and Proteins from Escherichia coli
Published on: June 9, 2014
Quantitative model of the phase behavior of recombinant pH-responsive elastin-like polypeptides
J Andrew Mackay1, Daniel J Callahan, Kelly N Fitzgerald
1Department of Biomedical Engineering, Duke University, 101 Science Drive, Durham, North Carolina 27708-0281, United States, St. Jude Medical, 11175 Cicero Drive, Suite 675, Alpharetta, Georgia 30022, United States, and Department of Pharmacology and Pharmaceutical Sciences, University of Southern California, 1985 Zonal Avenue, Los Angeles, California 90033-9121, United States.
Researchers developed a quantitative model for designing pH-responsive elastin-like polypeptides (ELPs). This model predicts the pH-dependent phase behavior of ELPs, enabling precise control over their transition triggered by environmental pH changes.
Area of Science:
- Biomaterials Engineering
- Polymer Science
- Biophysics
Background:
- Engineering biomaterials with environmentally responsive properties requires quantitative models.
- Elastin-like polypeptides (ELPs) are stimulus-responsive polymers that undergo reversible phase separation.
- Controlling the pH-dependent phase separation of charged ELPs is challenging due to multiple influencing factors.
Purpose of the Study:
- To develop a quantitative model for predicting the pH-dependent phase behavior of charged elastin-like polypeptides (ELPs).
- To enable the rational design of pH-responsive polypeptides with predictable transition behaviors.
Main Methods:
- Developed a model incorporating the Henderson-Hasselbalch relationship to describe side-chain ionization effects on ELP phase transition temperature.
- Validated the model using pH-responsive ELPs containing acidic (Glu) or basic (His) residues across a range of pH conditions.
Main Results:
- The developed quantitative model accurately describes the pH-dependent phase behavior of charged ELPs.
- Model validation confirmed its efficacy for ELPs with both acidic and basic residues.
- The model successfully predicted ELP phase separation across various pH levels.
Conclusions:
- The quantitative model provides a framework for understanding and predicting pH-responsive ELP phase behavior.
- This model facilitates the rational design of custom pH-responsive polypeptides for specific applications.
- Enables precise control over the pH-triggered transition of ELPs by tailoring their composition and environment.
