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    Clostridium perfringens α-toxin interaction with red cells and model membranes

    Jewell, S.A. and Titball, R.W. and Huyet, Jessica and Naylor, Claire and Basak, Ajit K. and Gologan, P. and Winlove, C.P. and Petrov, P.G. (2015) Clostridium perfringens α-toxin interaction with red cells and model membranes. Soft Matter 11 (39), pp. 7748-7761. ISSN 1744-683X.

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    Abstract

    The effects of Clostridium perfringens α-toxin on host cells have previously been studied extensively but the biophysical processes associated with toxicity are poorly understood. The work reported here shows that the initial interaction between the toxin and lipid membrane leads to measurable changes in the physical properties and morphology of the membrane. A Langmuir monolayer technique was used to assess the response of different lipid species to toxin. Sphingomyelin and unsaturated phosphatidylcholine showed the highest susceptibility to toxin lypolitic action, with a two stage response to the toxin (an initial, rapid hydrolysis stage followed by the insertion and/or reorganisation of material in the monolayer). Fluorescence confocal microscopy on unsaturated phosphatidylcholine vesicles shows that the toxin initially aggregates at discrete sites followed by the formation of localised “droplets” accumulating the hydrolysis products. This process is accompanied by local increases in the membrane dipole potential by about 50 (±42) mV. In contrast, red blood cells incubated with the toxin suffered a decrease of the membrane dipole potential by 50 (±40) mV in areas of high toxin activity (equivalent to a change in electric field strength of 107 V m−1) which is sufficient to affect the functioning of the cell membrane. Changes in erythrocyte morphology caused by the toxin are presented, and the early stages of interaction between toxin and membrane are characterised using thermal shape fluctuation analysis of red cells which revealed two distinct regimes of membrane-toxin interaction.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Science > Psychological Sciences
    Depositing User: Administrator
    Date Deposited: 05 Jul 2016 11:15
    Last Modified: 05 Aug 2016 06:54
    URI: http://eprints.bbk.ac.uk/id/eprint/15686

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