Anionic polymers of Bacillus subtilis cell wall modulate the folding rate of secreted proteins

Authors

  • R Chambert,

    Corresponding author
    1. Institut Jacques Monod, C.N.R.S., Universités Paris 6 et Paris 7, Laboratoire Génétique et Membranes, Tour 43, 2 place Jussieu, F-75251 Paris Cedex 05, France
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  • M.F Petit-Glatron

    1. Institut Jacques Monod, C.N.R.S., Universités Paris 6 et Paris 7, Laboratoire Génétique et Membranes, Tour 43, 2 place Jussieu, F-75251 Paris Cedex 05, France
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*Corresponding author. Tel.: +33 (1) 44 27 47 19; Fax: +33 (1) 44 27 59 94, E-mail address: chambert@ccr.jussieu.fr

Abstract

In order to characterize the dynamics of the interaction between the emergent membrane translocated exoprotein and the components of Bacillus subtilis cell wall, we examined the kinetics of the in vitro refolding of levansucrase and α-amylase, at pH 7 and 37°C, in the presence of polyphosphates (polyP) of various chain lengths (2≤n≤65). These soluble anionic polymers are considered here to mimic the role of teichoic acids. Even in the absence of calcium, levansucrase rapidly refolded in the presence of polyP of n≥16. In contrast, polyP modulate indirectly the rate of α-amylase refolding via their affinity for calcium. These differential effects might explain that the rate of the cell wall translocation of α-amylase secretion was found to be half that of levansucrase.

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