Probing Protein Interaction and Aggregation by Light Scattering

Abstract

Proteins are essential components of biological systems and their interactions and aggregation play critical roles in various cellular processes and diseases. Therefore, understanding protein interactions and aggregation is a fundamental task in molecular and cellular biology, and requires the development of reliable and sensitive methods for protein analysis. Light scattering is a powerful technique used to investigate the physical properties of particles in solution, including proteins. It has become an essential tool in biochemical and biophysical research due to its noninvasive nature and ability to provide information on the size, shape, and concentration of particles. This chapter provides an overview of the principles, applications, challenges, and future perspectives of light scattering for protein analysis, with a focus on interaction and aggregation studies. This chapter begins by introducing the basic principles of light scattering, including the types of scattering, the scattering angle and intensity, and the size and shape parameters derived from the scattering data. This chapter covers the principles and applications of static light scattering (SLS) and dynamic light scattering (DLS) along with various combinations with other techniques and are then discussed in detail, including their advantages, disadvantages, and recent applications in protein research. This chapter then focuses on the applications of light scattering for protein interaction and aggregation studies. However, despite its advantages and applications, light scattering also has some challenges and limitations that need to be considered and addressed when using this technique for protein analysis. Some of these are the sensitivity to dust, bubbles, or sample heterogeneity, the dependence on protein concentration and refractive index, and the difficulty in resolving complex mixtures or overlapping size distributions. Therefore, it is essential to optimize the experimental conditions, validate the results, and use complementary techniques to confirm and complement the light scattering data. With the advances in instrumentation, software, and data analysis, light scattering will continue to play an important role in protein research and can be integrated with other techniques, miniaturized, and applied to novel fields of protein science. Therefore, this chapter provides a comprehensive and up-to-date overview of the principles, applications, challenges, and future perspectives of light scattering for protein analysis, and can serve as a useful guide for researchers in molecular and cellular biology. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.