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Post-Proline Cleaving Enzymes (PPCEs): Classification, Structure, Molecular Properties, and Applications.

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Post-proline cleaving enzymes (PPCEs) are crucial proteases that break down proteins at proline residues. This review details their diverse origins, mechanisms, and significant biotechnological applications.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Proteases, or peptidases, are essential hydrolases found across all life forms, vital for cellular processing and regulation.
  • The MEROPS database classifies proteases by catalytic mechanisms; this review specifically examines post-proline cleaving enzymes (PPCEs).
  • PPCEs, including prolyl endoprotease/oligopeptidase (PEP/POP) from the serine peptidase family, are increasingly reported in plants, expanding beyond microbial and animal origins.

Purpose of the Study:

  • To synthesize recent structure-function studies of PPCEs from diverse peptidase families.
  • To provide insights into the molecular mechanisms underlying prolyl cleaving activity.
  • To offer a comprehensive review of PPCEs' biochemical properties, biological functions, and biotechnological applications across various taxa.

Main Methods:

  • Review of existing literature on post-proline cleaving enzymes (PPCEs).
  • Analysis of structure-function relationships in different peptidase families.
  • Synthesis of data on biochemical properties, biological functions, and biotechnological applications.

Main Results:

  • PPCEs, particularly serine peptidase family members like PEP/POP (S9 family), exhibit substrate selectivity for Pro-X bonds.
  • These enzymes possess distinct domains (β-propeller and α/β hydrolase) that regulate substrate access and catalytic activity.
  • PPCEs have demonstrated significant benefits in brewing, celiac disease therapeutics, drug targeting, and proteomics.
  • Protein engineering has enhanced PPCEs' properties like heat resistance and specificity for pharmacological uses.

Conclusions:

  • PPCEs are highly selective enzymes with broad biological significance and considerable biotechnological potential.
  • Understanding the molecular mechanisms of PPCEs is crucial for developing novel applications in medicine and industry.
  • This review provides a comprehensive overview of PPCEs, highlighting their diverse origins and multifaceted applications.