2hqs
From Proteopedia
| Line 4: | Line 4: | ||
==Overview== | ==Overview== | ||
| - | We report the crystal structure of the Escherichia coli TolB-Pal complex, a protein-protein complex involved in maintaining the integrity of the | + | We report the crystal structure of the Escherichia coli TolB-Pal complex, a protein-protein complex involved in maintaining the integrity of the outer membrane (OM) in all Gram-negative bacteria that is parasitized by colicins (protein antibiotics) to expedite their entry into cells. Nuclease colicins competitively recruit TolB using their natively disordered regions (NDRs) to disrupt its complex with Pal, which is thought to trigger translocation of the toxin across a locally destabilized OM. The structure shows induced-fit binding of peptidoglycan-associated lipoprotein (Pal) to the beta-propeller domain of TolB causing the N-terminus of one of its alpha-helices to unwind and several residues to undergo substantial changes in conformation. The resulting interactions with TolB are known to be essential for the stability of the complex and the bacterial OM. Structural comparisons with a TolB-colicin NDR complex reveal that colicins bind at the Pal site, mimicking rearranged Pal residues while simultaneously appearing to block induced-fit changes in TolB. The study therefore explains how colicins recruit TolB in the bacterial periplasm and highlights a novel binding mechanism for a natively disordered protein. |
==About this Structure== | ==About this Structure== | ||
| Line 13: | Line 13: | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
| - | [[Category: Bonsor, D | + | [[Category: Bonsor, D A.]] |
| - | [[Category: Dodson, E | + | [[Category: Dodson, E J.]] |
[[Category: Grishkovskaya, I.]] | [[Category: Grishkovskaya, I.]] | ||
[[Category: Kleanthous, C.]] | [[Category: Kleanthous, C.]] | ||
| Line 24: | Line 24: | ||
[[Category: tolb]] | [[Category: tolb]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:44:45 2008'' |
Revision as of 15:44, 21 February 2008
|
Crystal structure of TolB/Pal complex
Overview
We report the crystal structure of the Escherichia coli TolB-Pal complex, a protein-protein complex involved in maintaining the integrity of the outer membrane (OM) in all Gram-negative bacteria that is parasitized by colicins (protein antibiotics) to expedite their entry into cells. Nuclease colicins competitively recruit TolB using their natively disordered regions (NDRs) to disrupt its complex with Pal, which is thought to trigger translocation of the toxin across a locally destabilized OM. The structure shows induced-fit binding of peptidoglycan-associated lipoprotein (Pal) to the beta-propeller domain of TolB causing the N-terminus of one of its alpha-helices to unwind and several residues to undergo substantial changes in conformation. The resulting interactions with TolB are known to be essential for the stability of the complex and the bacterial OM. Structural comparisons with a TolB-colicin NDR complex reveal that colicins bind at the Pal site, mimicking rearranged Pal residues while simultaneously appearing to block induced-fit changes in TolB. The study therefore explains how colicins recruit TolB in the bacterial periplasm and highlights a novel binding mechanism for a natively disordered protein.
About this Structure
2HQS is a Protein complex structure of sequences from Escherichia coli with , and as ligands. Full crystallographic information is available from OCA.
Reference
Molecular mimicry enables competitive recruitment by a natively disordered protein., Bonsor DA, Grishkovskaya I, Dodson EJ, Kleanthous C, J Am Chem Soc. 2007 Apr 18;129(15):4800-7. Epub 2007 Mar 22. PMID:17375930
Page seeded by OCA on Thu Feb 21 17:44:45 2008
Categories: Escherichia coli | Protein complex | Bonsor, D A. | Dodson, E J. | Grishkovskaya, I. | Kleanthous, C. | ACT | GOL | SO4 | Pal | Tol | Tolb
