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1t9u

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{{STRUCTURE_1t9u| PDB=1t9u | SCENE= }}
{{STRUCTURE_1t9u| PDB=1t9u | SCENE= }}
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'''Structural Basis of Multidrug Transport by the AcrB Multidrug Efflux Pump'''
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===Structural Basis of Multidrug Transport by the AcrB Multidrug Efflux Pump===
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==Overview==
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The Escherichia coli AcrB multidrug efflux pump is a membrane protein that recognizes many structurally dissimilar toxic compounds. We previously reported the X-ray structures of four AcrB-ligand complexes in which the ligands were bound to the wall of the extremely large central cavity in the transmembrane domain of the pump. Genetic studies, however, suggested that discrimination between the substrates occurs mainly in the periplasmic domain rather than the transmembrane domain of the pump. We here describe the crystal structures of the AcrB mutant in which Asn109 was replaced by Ala, with five structurally diverse ligands, ethidium, rhodamine 6G, ciprofloxacin, nafcillin, and Phe-Arg-beta-naphthylamide. The ligands bind not only to the wall of central cavity but also to a new periplasmic site within the deep external depression formed by the C-terminal periplasmic loop. This depression also includes residues identified earlier as being important in the specificity. We show here that conversion into alanine of the Phe664, Phe666, or Glu673 residue in the periplasmic binding site produced significant decreases in the MIC of most agents in the N109A background. Furthermore, decreased MICs were also observed when these residues were mutated in the wild-type AcrB background, although the effects were more modest. The MIC data were also confirmed by assays of ethidium influx rates in intact cells, and our results suggest that the periplasmic binding site plays a role in the physiological process of drug efflux.
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{{ABSTRACT_PUBMED_16166543}}
==About this Structure==
==About this Structure==
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[[Category: 12 transmembrane]]
[[Category: 12 transmembrane]]
[[Category: Membrane protein]]
[[Category: Membrane protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 19:45:36 2008''

Revision as of 16:45, 27 July 2008

Image:1t9u.png

Template:STRUCTURE 1t9u

Structural Basis of Multidrug Transport by the AcrB Multidrug Efflux Pump

Template:ABSTRACT PUBMED 16166543

About this Structure

1T9U is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

A periplasmic drug-binding site of the AcrB multidrug efflux pump: a crystallographic and site-directed mutagenesis study., Yu EW, Aires JR, McDermott G, Nikaido H, J Bacteriol. 2005 Oct;187(19):6804-15. PMID:16166543

Page seeded by OCA on Sun Jul 27 19:45:36 2008

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