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Related Experiment Videos

Nardilysin cleaves peptides at monobasic sites.

K Martin Chow1, Oliver Oakley, Jack Goodman

  • 1Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, Kentucky 40536-0298, USA.

Biochemistry
|February 20, 2003
PubMed
Summary

Nardilysin, a peptidase, can cleave peptides at single basic residues, not just dibasic pairs. This finding expands the known substrates for nardilysin, confirming its role as a versatile enzyme in peptide hydrolysis.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Proteomics

Background:

  • Nardilysin (N-arginine dibasic convertase) was initially identified for cleaving peptides at Arg-Arg or Arg-Lys dibasic sites.
  • Adjacent aromatic residues can influence nardilysin's cleavage site specificity.

Purpose of the Study:

  • To determine if nardilysin can cleave peptides at monobasic sites.
  • To characterize the substrate specificity of nardilysin beyond dibasic residues.

Main Methods:

  • Enzyme kinetics assays using fluorogenic peptide substrates based on beta-endorphin and kallidin sequences.
  • Comparative analysis of cleavage rates (kcat/Km) at different sites.

Main Results:

  • Nardilysin efficiently cleaves beta-endorphin at the monobasic Phe(17)-Lys(18) site.

Related Experiment Videos

  • Hydrolysis occurs at various monobasic sites (e.g., F-K, F-R, W-K, M-K, Y-K, L-K) in model peptides.
  • Cleavage kinetics at monobasic sites are comparable to dibasic sites, but K-F is not hydrolyzed.

    • Conclusions:

    • Nardilysin exhibits broader substrate specificity than previously known, including cleavage at monobasic residues.
    • These findings confirm nardilysin as a true peptidase with diverse substrate recognition capabilities.
    • The enzyme's activity extends to various biologically relevant peptides, impacting proteomics research.