Characterization and role of Peptidase N from Salmonella enterica serovar Typhimurium

Anujith Kumar, Dipankar Nandi

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15 Citations (Scopus)


ATP-independent peptidases are important during the distal steps of cytosolic protein degradation. The contribution of a member of this group, Peptidase N (PepN) was studied in Salmonella enterica serovar Typhimurium (Salmonella typhimurium). The ΔpepN strain displays greatly reduced cleavage of 9 out of a total of 13 exopeptidase substrates, demonstrating a significant contribution of PepN to cytosolic aminopeptidase activity. The cleavage profile of purified S. typhimurium PepN is Arg>Ala>Thr, demonstrating broad specificity. Comparative biochemical studies with purified PepN from Escherichia coli and S. typhimurium revealed the latter to be distinct: S. typhimurium PepN cleaves Thr-AMC more efficiently and is less sensitive to inhibition by N-ethylmaleimide. Studies with ΔpepN and PepN overexpression demonstrated its importance for growth during nutritional downshift in combination with high temperature stress. In summary, S. typhimurium PepN contributes significantly to cytosolic aminopeptidase activity and its role is manifested under selected stress conditions.

Original languageEnglish
Pages (from-to)706-712
Number of pages7
JournalBiochemical and Biophysical Research Communications
Issue number3
Publication statusPublished - 16-02-2007

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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