Ronald Baankreis

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The chromosomal pepN gene encoding lysyl-aminopeptidase activity in Lactococcus lactis has been identified in a lambda EMBL3 library in Escherichia coli by using an immunological screening with antiserum against a purified aminopeptidase fraction. The pepN gene was localized and subcloned in E. coli on the basis of its expression and hybridization to a(More)
One single, cytosolic aminopeptidase (AP N, EC is found to be responsible for both leucyl-(leucylAP) and lysylaminopeptidese (lysylAP) activity detectible with whole cells of Lactococcus lactis subsp. cremoris strain HP. The existence of a cell-envelope-located form of this enzyme could be excluded. No restriction on the activity of the enzyme is(More)
Two intracellular oligopeptide-preferring endopeptidases have been detected in Lactococcus lactis. A neutral thermolysin-like oligoendopeptidase (NOP) has been purified to homogeneity and an alkaline oligoendopeptidase has been partially purified. The specificity of the oligoendopeptidases towards important intermediary cheese peptides, produced by chymosin(More)
where abound and afree are pre-exponential factors associated with long ('rbound) and short (Z'free) lifetime, respectively. This ratio is identical to that measured by spectral decomposition [1] but the methods of time-resolved spectroscopy afford a higher sensitivity and precision of its determination. Increase in the negative potential of yeast cells(More)
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