The Lactobacillus helveticus CNRZ32 gene encoding a di-/tri- peptidase with prolinase activity (pepPN) was sequenced. An open reading frame of 912 base pairs was identified corresponding to a peptide with a molecular mass of 35.04 kDa. Southern hybridization indicated that the gene sequence is well conserved in strains of lactobacilli and pediococci.
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Edward G. Dudley (1994) studied this question.
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