Peptidoglycan-associated lipoprotein-TolB interaction. A possible key to explaining the formation of contact sites between the inner and outer membranes of Escherichia coli - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Biological Chemistry Année : 1995

Peptidoglycan-associated lipoprotein-TolB interaction. A possible key to explaining the formation of contact sites between the inner and outer membranes of Escherichia coli

Résumé

TolA, -B, -Q, and -R proteins are involved in maintaining the cell envelope integrity of Escherichia coli; they have been parasitized by the group A colicins and the single strand DNA of some filamentous bacteriophages to permit them to enter the cells. TolA and TolR are anchored to the inner membrane by a single transmembrane domain, TolQ is an integral membrane protein with three transmembrane segments, and TolB has recently been found to be periplasmic although it is partially membrane-associated. The latter result suggests that TolB might interact with membrane proteins. Other lines of evidence favor the existence of a Tol complex. To further characterize this complex, we investigated which proteins interact with TolB. For this purpose, two different methods were used. First, we took advantage of the existence of a tagged TolB (TolBep) to perform immunoprecipitation under native conditions in order to preserve the putative associations of TolBep with other proteins. Secondly, in vivo cross-linking experiments with formaldehyde were performed. These two approaches led to the same result and demonstrated for the first time that a component of the Tol system, TolB, interacts with a protein located in the outer membrane, the peptidoglycan-associated lipoprotein.

Dates et versions

hal-02130195 , version 1 (15-05-2019)

Identifiants

Citer

E. Bouveret, R Derouiche, R. Rigal, R Lloubès, C Lazdunski, et al.. Peptidoglycan-associated lipoprotein-TolB interaction. A possible key to explaining the formation of contact sites between the inner and outer membranes of Escherichia coli. Journal of Biological Chemistry, 1995, 270 (19), pp.11071-11077. ⟨10.1074/jbc.270.19.11071⟩. ⟨hal-02130195⟩
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