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Characterizing Individual Protein Aggregates by Infrared Nanospectroscopy and Atomic Force Microscopy
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Methods for characterization of protein aggregates.

Witold Tatkiewicz1, Elisa Elizondo, Evelyn Moreno

  • 1Department of Molecular Nanoscience and Organic Materials, Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Bellaterra, Cerdanyola del Vallès, 08193, Barcelona, Spain.

Methods in Molecular Biology (Clifton, N.J.)
|December 3, 2014
PubMed
Summary

Physicochemical characterization of protein aggregates, including bacterial inclusion bodies (IBs), is crucial for understanding diseases and their use as biomaterials. This study details methods for analyzing aggregate properties like structure, size, stability, and mechanics.

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Area of Science:

  • Biophysics
  • Materials Science
  • Biotechnology

Background:

  • Protein aggregate formation is a hallmark of many diseases.
  • Bacterial inclusion bodies (IBs) are pure protein aggregates with potential as biomaterials.
  • Limited knowledge exists regarding the physicochemical properties of IBs.

Purpose of the Study:

  • To present methods for characterizing protein aggregates as particulate materials.
  • To detail techniques for assessing physicochemical and nanoscale properties.
  • To provide examples of data interpretation for real samples.

Main Methods:

  • Infrared spectroscopy (IR) for secondary structure.
  • Dynamic light scattering (DLS) and nanosight for sizing and counting.
  • Z-potential for colloidal stability.
  • Atomic force microscopy (AFM) for morphology and nanomechanical properties.
  • Cryo-transmission electron microscopy (Cryo-TEM) for internal structuration.
  • Contact angle (CA) for wettability.

Main Results:

  • Established methods for comprehensive physicochemical characterization of protein aggregates.
  • Demonstrated the utility of various techniques for analyzing size, structure, stability, and mechanical properties.
  • Provided practical examples of data interpretation for diverse applications.

Conclusions:

  • The presented methods enable detailed physicochemical and nanoscale characterization of protein aggregates.
  • Understanding these properties is vital for both disease research and the development of novel biomaterials from IBs.
  • This work facilitates the engineering and application of protein aggregates in biotechnology.