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Detecting and Characterizing Protein Self-Assembly In Vivo by Flow Cytometry
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Ambient Temperature Affects Protein Self-Assembly by Interfering with the Interfacial Aggregation Behavior.

Han-Zhang Mou1, Cong-Lin Zhao1, Juan Song1

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Ambient temperature significantly impacts in vitro protein fibrillation kinetics and molecular structure. Understanding this ambient temperature (AT) effect is crucial for reproducible amyloid self-assembly research and evaluating amyloid accelerators or inhibitors.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Materials Science

Background:

  • Amyloid fibrillation is linked to degenerative diseases and has biomedical applications.
  • In vitro studies of amyloid fibrillation often suffer from poor reproducibility and debated mechanisms.
  • Ambient temperature (AT) has been identified as a critical, yet often overlooked, factor in protein self-assembly.

Purpose of the Study:

  • To investigate the influence of ambient temperature (AT) on the in vitro self-assembly of hen egg-white lysozyme.
  • To elucidate the effect of AT on the kinetics and molecular conformational changes during protein aggregation.
  • To understand the underlying reasons for AT's impact on protein fibrillation.

Main Methods:

  • Multimodal molecular spectroscopy was employed to monitor protein aggregation.
  • The study analyzed the dependence of interfacial area and catalysis on protein aggregation.
  • Hen egg-white lysozyme was used as a model globular protein for in vitro self-assembly studies.

Main Results:

  • Ambient temperature was confirmed as a significant interfering factor in hen egg-white lysozyme fibrillation.
  • AT was shown to affect the kinetics of protein aggregation and induce conformational changes.
  • The influence of AT was attributed to varied protein aggregation behaviors at the two-phase interface.

Conclusions:

  • Clarifying ambient temperature is essential for accurate in vitro protein fibrillation mechanism studies.
  • This finding offers a new perspective on protein self-assembly mechanisms.
  • The results may impact the evaluation of amyloid accelerators and inhibitors.