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pubmed-article:19819701pubmed:abstractTextMultidrug ABC transporters can transport a wide range of drugs from the cell. Ongoing studies of the prototype mammalian multidrug resistance ATP-binding cassette transporter P-glycoprotein (ABCB1) have revealed many intriguing functional and biochemical features. However, a gap remains in our knowledge regarding the molecular basis of its broad specificity for structurally unrelated ligands. Recently, the first crystal structures of ligand-free and ligand-bound ABCB1 showed ligand binding in a cavity between its two membrane domains, and earlier observations on polyspecificity can now be interpreted in a structural context. Comparison of the new ABCB1 crystal structures with structures of bacterial homologs suggests a critical role for an axial rotation of transmembrane helices for high-affinity binding and low-affinity release of ligands during transmembrane transport.lld:pubmed
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pubmed-article:19819701pubmed:copyrightInfoCopyright 2009 Elsevier Ltd. All rights reserved.lld:pubmed
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pubmed-article:19819701pubmed:volume35lld:pubmed
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pubmed-article:19819701pubmed:dateRevised2011-6-21lld:pubmed
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pubmed-article:19819701pubmed:articleTitleUnderstanding polyspecificity of multidrug ABC transporters: closing in on the gaps in ABCB1.lld:pubmed
pubmed-article:19819701pubmed:affiliationDepartment of Pharmacology, University of Cambridge, Cambridge, UK.lld:pubmed
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