Physicochemical Principles Governing the Intrinsically Disordered Salivary Peptide Histatin 5: Ensemble Structure,
Oskar Svensson1,2, Samuel Lenton3, Marie Skepö1,2
1Division of Computational Chemistry, Department of Chemistry, Science for Life Laboratory, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
The Journal of Physical Chemistry. B
|March 30, 2026
Summary
Histatin 5 (Hst5), a disordered protein, adapts to environments by remaining flexible. This adaptability is key to its function and makes it a model for studying intrinsically disordered proteins (IDPs).
Area of Science:
- Biochemistry
- Biophysics
- Structural Biology
Background:
- Histatin 5 (Hst5) is a histidine-rich intrinsically disordered protein (IDP).
- IDPs lack stable structures, enabling dynamic conformational ensembles and environmental sensitivity.
- Hst5's disordered nature allows adaptation to various conditions like pH, ionic strength, and interfaces.
Purpose of the Study:
- To synthesize current understanding of Hst5's behavior.
- To explore how intrinsic disorder, charge regulation, histidine chemistry, and interactions govern Hst5.
- To highlight Hst5 as a benchmark for IDP research and computational methods.
Main Methods:
- Small-angle X-ray scattering (SAXS)
- Neutron-based methods
- Surface-sensitive techniques
- Computer simulations
- Integrative and machine-learning approaches
Main Results:
- Quantitative characterization of Hst5's ensemble structure, thermodynamics, and interactions.
- Demonstration of Hst5's continuous adaptation to diverse environmental factors.
- Establishment of Hst5 as a model system for physicochemical principles of IDPs.
Conclusions:
- Intrinsic disorder and histidine chemistry are crucial for Hst5's function.
- Hst5's adaptability is governed by multiscale interactions.
- Hst5 serves as a valuable model for advancing IDP research and computational methodologies.
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