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New biologically active hybrid bacteriocins constructed by combining regions from various pediocin-like bacteriocins: the C-terminal region is important for determining specificity.

Abstract：

:The pediocin-like bacteriocins, produced by lactic acid bacteria, are bactericidal polypeptides with very similar primary structures. Peptide synthesis followed by reverse-phase and ion-exchange chromatographies yielded biologically active pediocin-like bacteriocins in amounts and with a purity sufficient for characterizing their structure and mode of action. Despite similar primary structures, the pediocin-like bacteriocins, i.e., pediocin PA-1, sakacin P, curvacin A, and leucocin A, differed in their relative toxicities against various bacterial strains. On the basis of the primary structures, the polypeptides of these bacteriocins were divided into two modules: the relatively hydrophilic and well conserved N-terminal region, and the somewhat more diverse and hydrophobic C-terminal region. By peptide synthesis, four new biologically active hybrid bacteriocins were constructed by interchanging corresponding modules from various pediocin-like bacteriocins. All of the new hybrid bacteriocin constructs had bactericidal activity. The relative sensitivity of different bacterial strains to a hybrid bacteriocin was similar to that to the bacteriocin from which the C-terminal module was derived and quite different from that to the bacteriocin from which the N-terminal was derived. Thus, the C-terminal part of the pediocin-like bacteriocins is an important determinant of the target cell specificity. The synthetic bacteriocins were more stable than natural isolates, presumably as a result of the absence of contaminating proteases. However, some of the synthetic bacteriocins lost activity, but this was detectable only after months of storage. Mass spectrometry suggested that this instability was due to oxidation of methionine residues, resulting in a 10- to 100-fold reduction in activity.

journal_name

Appl Environ Microbiol

journal_title

Applied and environmental microbiology

authors

Fimland G,Blingsmo OR,Sletten K,Jung G,Nes IF,Nissen-Meyer J

doi

10.1128/AEM.62.9.3313-3318.1996

subject

Has Abstract

pub_date

1996-09-01 00:00:00

pages

3313-8

issue

eissn

0099-2240

issn

1098-5336

journal_volume

pub_type

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New biologically active hybrid bacteriocins constructed by combining regions from various pediocin-like bacteriocins: the C-terminal region is important for determining specificity.