Evidence that dissipation of proton motive force is a common mechanism of action for bacteriocins and other antimicrobial proteins.

Abstract:

:While bacteriocins from lactic acid bacteria (LAB) have generated tremendous interest among food microbiologists, they are not unique. The biosphere is awash with antimicrobial proteins such as colicins, defensins, cecropins, and magainins. These proteins share many characteristics. They are low molecular weight, cationic, amphiphilic, tend to aggregate and are benign to the producing organism. In cases where the mode of action has been investigated, the cell membrane appears to be the site of action. There is increasing evidence that bacteriocins from many bacterial genera also share these characteristics. After a brief introduction on the significance of LAB bacteriocins, this review provides some background on proton motive force. Current studies of mechanisms for various bacteriocins are reviewed. Evidence is then introduced that bacteriocins produced by lactic acid bacteria act by the common mechanism of depleting proton motive force. The role and importance of energized membranes in this process is examined. These observations are linked to literature which demonstrates that many other classes of antimicrobial proteins act by the same mechanism. Questions regarding the role of receptor proteins and the physical mechanism by which PMF is depleted remain unresolved.

journal_name

Int J Food Microbiol

authors

Montville TJ,Bruno ME

doi

10.1016/0168-1605(94)90106-6

subject

Has Abstract

pub_date

1994-12-01 00:00:00

pages

53-74

issue

1-2

eissn

0168-1605

issn

1879-3460

pii

0168-1605(94)90106-6

journal_volume

24

pub_type

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