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Emerging concepts in pseudoenzyme classification, evolution, and signaling.

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Pseudoenzymes are proteins lacking enzyme activity, crucial for biological regulation. Understanding these pseudoenzymes reveals new therapeutic targets and uncovers novel functions of related enzymes.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Systems Biology

Background:

  • Pseudoenzymes are homologous to enzymes but lack catalytic activity due to mutations.
  • Pseudokinases are the most studied type, but other pseudoenzymes are increasingly recognized.
  • These proteins play diverse roles in cellular signaling pathways.

Purpose of the Study:

  • To review the current understanding of pseudoenzyme-driven regulatory mechanisms.
  • To highlight the diverse non-catalytic functions of pseudoenzymes.
  • To discuss the therapeutic potential of targeting pseudoenzymes.

Main Methods:

  • Bioinformatics analysis across prokaryotes, archaea, and eukaryotes.
  • Review of experimental data on pseudoenzyme function and structure.
  • Integration of cell signaling and bioinformatics approaches.

Main Results:

  • Pseudoenzymes constitute 5-10% of enzyme families, with varying prevalence across kingdoms.
  • Pseudoenzymes function as scaffolds, molecular switches, and regulators of signaling complexes.
  • Some pseudoenzymes exhibit previously undiscovered enzymatic activities.
  • Pseudoenzymes represent potential therapeutic targets or anti-targets.

Conclusions:

  • Pseudoenzymes are critical regulators in biological systems with diverse non-catalytic roles.
  • Further research into pseudoenzymes enhances our understanding of enzyme function and signaling networks.
  • Targeting pseudoenzymes offers new therapeutic strategies for various diseases.