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Related Experiment Videos

Regulation of protein function by native metastability.

C Lee1, S H Park, M Y Lee

  • 1National Creative Research Initiative Center, Korea Research Institute of Bioscience and Biotechnology, 52 Oun-dong, Yusong, Taejon 305-333, Korea.

Proceedings of the National Academy of Sciences of the United States of America
|July 8, 2000
PubMed
Summary

Native metastability in proteins like serpins is crucial for function. Filling cavities in alpha(1)-antitrypsin increased stability but decreased inhibitory activity, suggesting metastability is a design for protein function regulation.

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Area of Science:

  • Protein structure and function
  • Biochemistry
  • Molecular biology

Background:

  • Native proteins are typically in their most stable state.
  • Inhibitory serpins and viral fusion proteins exist in a metastable native state, essential for their biological roles.
  • Structural defects like cavities contribute to this metastability.

Purpose of the Study:

  • To investigate the functional consequences of altering native metastability in alpha(1)-antitrypsin, a prototype serpin.
  • To elucidate the mechanism by which structural defects regulate protein function.

Main Methods:

  • Characterization of cavity-filling mutations in alpha(1)-antitrypsin.
  • Analysis of conformational stability in relation to side-chain volume.
  • Correlation of stability with inhibitory activity and conformational switch rates.

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Main Results:

  • Conformational stability increased linearly with the van der Waals volume of introduced side chains.
  • Increased conformational stability was directly correlated with decreased inhibitory activity.
  • Activity loss correlated with a reduced rate of conformational switching upon protease binding.

Conclusions:

  • Native protein metastability is a deliberate structural design feature.
  • This metastability plays a critical role in regulating protein function, particularly inhibitory activity in serpins.
  • Altering structural defects like cavities impacts protein dynamics and function.