ABC proteins in antigen translocation and viral inhibition.

Nature Chemical Biology
David Parcej, Robert Tampé

Abstract

How ABC transporters work is a key issue because of their important roles in multidrug resistance of pathogenic bacteria, reduced efficacy of antitumor drugs, cholesterol metabolism, cell homeostasis and immune response. In the past few years, significant progress has been made in crystallization and structure determination of (mostly) bacterial ABC transporters, as well as in functional studies on ABC systems involved in human pathology. In this review, we use the transporter associated with antigen processing (TAP) to illustrate what is known regarding the mechanism of substrate transport. We also discuss the chemical basis of substrate recognition by TAP and the allosteric cross-talk between the binding of substrate, the release of chemical energy by ATP hydrolysis and cross-membrane translocation. Finally, we detail the role of TAP in a large macromolecular assembly, which optimally loads MHC class I molecules, and the interference with this machinery by TAP-targeted viral factors. Because of structural and probable mechanistic similarities, the understanding of the detailed structure and mechanism of TAP will be applicable to all ABC systems, including those of medical relevance.

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Jun 7, 2012·Biochemistry·Andreas Hinz, Robert Tampé
Mar 27, 2012·Nature Structural & Molecular Biology·Michael HohlMarkus A Seeger
Mar 21, 2013·Proceedings of the National Academy of Sciences of the United States of America·Nir TalOded Lewinson
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