Interactions of TolB with the Translocation Domain of Colicin E9 Require an Extended TolB Box
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چکیده
منابع مشابه
Interactions of TolB with the translocation domain of colicin E9 require an extended TolB box.
The mechanism by which enzymatic E colicins such as colicin E3 (ColE3) and ColE9 cross the outer membrane, periplasm, and cytoplasmic membrane to reach the cytoplasm and thus kill Escherichia coli cells is unique in prokaryotic biology but is poorly understood. This requires an interaction between TolB in the periplasm and three essential residues, D35, S37, and W39, of a pentapeptide sequence ...
متن کاملCompetitive recruitment of the periplasmic translocation portal TolB by a natively disordered domain of colicin E9.
The natively disordered N-terminal 83-aa translocation (T) domain of E group nuclease colicins recruits OmpF to a colicin-receptor complex in the outer membrane (OM) as well as TolB in the periplasm of Escherichia coli, the latter triggering translocation of the toxin across the OM. We have identified the 16-residue TolB binding epitope in the natively disordered T-domain of the nuclease colici...
متن کاملThe crystal structure of the TolB box of colicin A in complex with TolB reveals important differences in the recruitment of the common TolB translocation portal used by group A colicins
Interaction of the TolB box of Group A colicins with the TolB protein in the periplasm of Escherichia coli cells promotes transport of the cytotoxic domain of the colicin across the cell envelope. The crystal structure of a complex between a 107-residue peptide (TA(1-107)) of the translocation domain of colicin A (ColA) and TolB identified the TolB box as a 12-residue peptide that folded into a...
متن کاملMinimum length requirement of the flexible N-terminal translocation subdomain of colicin E3.
The 315-residue N-terminal T domain of colicin E3 functions in translocation of the colicin across the outer membrane through its interaction with outer membrane proteins including the OmpF porin. The first 83 residues of the T domain are known from structure studies to be disordered. This flexible translocation subdomain contains the TolB box (residues 34 to 46) that must cross the outer membr...
متن کاملColicins exploit native disorder to gain cell entry: a hitchhiker's guide to translocation.
The translocation of protein toxins into a cell relies on a myriad of protein-protein interactions. One such group of toxins are enzymatic E colicins, protein antibiotics produced by Escherichia coli in times of stress. These proteins subvert ordinary nutrient uptake mechanisms to enter the cell and unleash nuclease activity. We, and others, have previously shown that uptake of ColE9 (colicin E...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 2005
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.187.19.6733-6741.2005