TolB: Difference between revisions
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{{STRUCTURE_1c5k | PDB=1c5k | SCENE= TolB/Tolb/1 }} | |||
TolB has been shown to be essential for the function of the [[Tol]] system in ''Escherichia coli''<ref>PMID: 19696740</ref> by generating an allosteric signal based on a conformational switch in the β-propeller region. | TolB has been shown to be essential for the function of the [[Tol]] system in ''Escherichia coli''<ref>PMID: 19696740</ref> by generating an allosteric signal based on a conformational switch in the β-propeller region. | ||
==Structure== | ==Structure== | ||
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==The TolB-Pal Complex== | ==The TolB-Pal Complex== | ||
The TolB-[[Pal]] complex is involved in maintaining the outer membrane integrity. This complex is parasitised by protein antibiotics and disrupted in order to trigger the translocation of the toxin across the outer membrane (see [[Colicin]] for further information).<ref name='Bonsor'>PMID: 17375930</ref> | The TolB-[[Pal]] complex is involved in maintaining the outer membrane integrity. This complex is parasitised by protein antibiotics and disrupted in order to trigger the translocation of the toxin across the outer membrane (see [[Colicin]] for further information).<ref name='Bonsor'>PMID: 17375930</ref> | ||
<structure load='2w8b' size='300' align='right' caption='Interaction of Tolb and Pal' (PDB entry [[2w8b]] | SCENE= TolB/Tolbpal/1 /> | |||
To study the interaction of TolB with Pal, two studies were carried out<ref name='Bouveret'>PMID 7744736</ref>: TolBBep (tagging TolB for immunoprecipitation), which allows the associated proteins to remain in contact with TolB, and ''in vivo'' cross-linking experiments with formaldehyde. Immunoprecipitation gave the result that Pal co-precipitates with TolBBep, while the cross-linking showed that in the present of Pal, the two products migrated close to each other, but in the absence of Pal, neither band was present, demonstrating an interaction between the two. These two experiments showed that TolB directly interacts with Pal, and that this interaction is responsible for maintaining the association of TolB with the membrane. | To study the interaction of TolB with Pal, two studies were carried out<ref name='Bouveret'>PMID 7744736</ref>: TolBBep (tagging TolB for immunoprecipitation), which allows the associated proteins to remain in contact with TolB, and ''in vivo'' cross-linking experiments with formaldehyde. Immunoprecipitation gave the result that Pal co-precipitates with TolBBep, while the cross-linking showed that in the present of Pal, the two products migrated close to each other, but in the absence of Pal, neither band was present, demonstrating an interaction between the two. These two experiments showed that TolB directly interacts with Pal, and that this interaction is responsible for maintaining the association of TolB with the membrane. | ||
== References== | == References== | ||
<references/> | <references/> | ||
