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A fluorescence-based array screen for transglutaminase substrates.

Miroslav Malešević1, Andreas Migge2, Thomas C Hertel2

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Summary

Microbial transglutaminase activity is influenced by adjacent amino acids. Hydrophobic and basic residues, particularly arginine, tyrosine, and leucine, enhance isopeptide bond formation, aiding enzyme substrate research.

Keywords:
fluorescencepeptidesspot synthesissubstrate specificitytransglutaminase

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Area of Science:

  • Enzymology
  • Protein Chemistry

Background:

  • Transglutaminases (EC 2.3.2.13) catalyze isopeptide bond formation, crucial for physiological and pathophysiological processes.
  • Despite extensive study, transglutaminase substrate preferences remain poorly understood.

Purpose of the Study:

  • To investigate the impact of amino acids flanking glutamine and lysine on microbial transglutaminase catalysis.
  • To elucidate substrate specificity in transglutaminase-mediated reactions.

Main Methods:

  • Utilized focused combinatorial peptide libraries (400 peptides) to screen for enzyme activity.
  • Employed peptide microarray technology for high-throughput analysis.
  • Synthesized specific tripeptide substrates for detailed kinetic analysis.

Main Results:

  • Identified a significant positive influence of hydrophobic and basic amino acids adjacent to the target glutamine residue.
  • Arginine, tyrosine, and leucine were found to strongly promote isopeptide bond formation.
  • Enzymatic kinetic parameters were determined using both microarray and solution-based assays.

Conclusions:

  • Adjacent amino acid residues play a critical role in modulating microbial transglutaminase substrate recognition.
  • Findings provide valuable insights into the enzyme's catalytic mechanism and substrate preferences.
  • This research facilitates the design of targeted transglutaminase substrates and inhibitors.