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Degradative covalent reactions important to protein stability

D B Volkin1, H Mach, C R Middaugh

  • 1Merck Research Laboratories, West Point, PA 19486, USA.

Molecular Biotechnology
|December 24, 1997
PubMed
Summary

Protein modifications like deamidation, oxidation, and glycation can occur during purification and storage. Understanding these chemical changes is crucial for maintaining protein integrity in research and biopharmaceutical applications.

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Area of Science:

  • Biochemistry
  • Protein Chemistry
  • Analytical Chemistry

Background:

  • Proteins are susceptible to chemical modifications during handling.
  • These modifications can impact protein function and experimental results.
  • In vitro processes require careful consideration of protein stability.

Purpose of the Study:

  • To review common chemical modifications of proteins during in vitro processes.
  • To highlight the importance of understanding these modifications for protein integrity.
  • To provide a reference for researchers working with purified proteins.

Main Methods:

  • Literature review of protein chemical modifications.
  • Compilation of observed covalent modifications.
  • Discussion of modification mechanisms.

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Main Results:

  • Identified common covalent modifications: deamidation, isoaspartate formation, peptide bond cleavage, cystine destruction, thiol-disulfide interchange, oxidation, glycation, and carbamylation.
  • Detailed specific residues affected, such as aspartic acid, cysteine, and methionine.
  • Described modifications of amino groups.

Conclusions:

  • Chemical modifications are frequent during protein purification and storage.
  • Awareness of these modifications is essential for accurate interpretation of protein data.
  • Strategies to mitigate these changes are important for biopharmaceutical development.