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Protein and Protein Structure02:15

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Quaternary Structure Modeling Through Chemical Cross-Linking Mass Spectrometry: Extending TX-MS Jupyter Reports
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Quinary structure modulates protein stability in cells.

William B Monteith1, Rachel D Cohen1, Austin E Smith1

  • 1Departments of Chemistry and.

Proceedings of the National Academy of Sciences of the United States of America
|January 28, 2015
PubMed
Summary
This summary is machine-generated.

Cellular protein interactions, or quinary structure, are crucial for cell organization and metabolism. Our study quantifies these interactions, revealing their significant impact on protein stability within the cell.

Keywords:
H/D exchangeprotein NMRprotein thermodynamicsquinary interactions

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Protein structure is traditionally defined by secondary, tertiary, and quaternary interactions.
  • Quinary interactions, or protein-matrix contacts within the cellular environment, are poorly understood.
  • Studying proteins in vitro using buffered solutions does not fully capture their in vivo behavior.

Purpose of the Study:

  • To quantify the significance of quinary interactions in vivo.
  • To investigate the impact of the cellular environment on protein stability.
  • To establish the role of protein-matrix contacts in cellular organization and metabolism.

Main Methods:

  • Utilized Nuclear Magnetic Resonance (NMR)-detected Hydrogen-Deuterium (H/D) exchange.
  • Quantified quinary interactions between the B1 domain of protein G and the cytosol of Escherichia coli.
  • Assessed the effect of a surface mutation on protein stability in both cellular and buffered environments.

Main Results:

  • Demonstrated that a surface mutation was 10-fold more destabilizing within E. coli cells compared to a buffered solution.
  • Established the significant contribution of quinary interactions to overall protein stability.
  • Showed that the energy of quinary interactions can be comparable to those stabilizing protein complexes.

Conclusions:

  • Quinary interactions play a critical role in organizing cellular interiors and metabolism.
  • The cellular environment significantly influences protein stability through quinary interactions.
  • Incorporating quinary structure into proteome models is essential for a comprehensive understanding of cellular function.