Hydrolysis of casein derived peptidesαS1-CN (f1-9) and β-CN (f193-209) by Lactobacillus helveticus peptidase deletion mutantsindicates the presence of a previously undetected endopeptidase
Document Type
Article
Journal/Book Title/Conference
Applied and Environmental Microbiology
Volume
69
Issue
2
Publisher
American Society of Microbiology
Publication Date
2003
First Page
1283
Last Page
1286
Abstract
Peptides derived from hydrolysis of αS1-casein(f1-9) [αS1-CN(f1-9)] and β-CN(f193-209) with cell extracts of Lactobacillus helveticus CNRZ32 and single-peptidase mutants (ΔpepC, ΔpepE, ΔpepN, ΔpepO, and ΔpepX) were isolated by using reverse-phase high-performance liquid chromatography and were characterized by mass spectrometry. The peptides identified suggest that there was activity of an endopeptidase, distinct from previously identified endopeptidases (PepE and PepO), with specificity for peptide bonds C terminal to Pro residues. Identification of hydrolysis products derived from a carboxyl-blocked form of β-CN(f193-209) confirmed that the peptides were derived from the activity of an endopeptidase.
Recommended Citation
Christensen, J. E., J. R. Broadbent, and J. L. Steele. 2003. Hydrolysis of casein derived peptides αS1-CN (f1-9) and β-CN (f193-209) by Lactobacillus helveticus peptidase deletion mutants indicates the presence of a previously undetected endopeptidase. Appl. Environ. Microbiol. 69:1283-1286.
