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Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
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Stabilization of Multimeric Proteins via Intersubunit Cyclization.

Lu Zhu1, Shuwen Wang1, Wenya Tian1

  • 1Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan, China.

Applied and Environmental Microbiology
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Summary

We discovered that connecting the ends and internal interfaces of multimeric proteins significantly enhances their stability. This novel cyclization strategy improves thermostability, overcoming limitations of traditional protein engineering for industrial applications.

Keywords:
alcohol dehydrogenaseinternal interface connectionmultimeric proteinprotein stabilityterminal ends connection

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Area of Science:

  • Biochemistry
  • Protein Engineering
  • Structural Biology

Background:

  • Multimeric proteins are crucial for industrial and medicinal applications due to their catalytic efficiency.
  • Low protein stability often restricts the wider application of these valuable enzymes.
  • Current strategies focus on internal subunit interfaces, neglecting terminal ends.

Purpose of the Study:

  • To investigate the significance of subunit terminal ends in multimeric protein stability.
  • To develop a novel strategy for enhancing protein stability by targeting both terminal and internal interfaces.
  • To improve the thermostability and resilience of the tetrameric Leifsonia alcohol dehydrogenase (LnADH).

Main Methods:

  • Engineered disulfide bonds to connect subunit terminal ends and internal interfaces.
  • Cyclized the tetrameric LnADH protein into a rigid structure.
  • Assessed protein stability through thermostability measurements (T5015 and T).

Main Results:

  • Confirmed that subunit terminal ends are as critical as internal interfaces for protein stability.
  • Achieved significant improvements in thermostability: an 18°C increase in T5015 and a 23.3°C increase in T.
  • The cyclized LnADH exhibited enhanced rigidity and resilience compared to the wild-type.

Conclusions:

  • Subunit terminal end connections represent a novel and effective strategy for improving multimeric protein stability.
  • Intersubunit cyclization yields superior thermostability compared to conventional protein engineering methods.
  • This approach is broadly applicable to the short-chain dehydrogenase/reductase family and other multimeric proteins.