Structure of Prototypic Peptide Transporter DtpA from E. coli in Complex with Valganciclovir Provides Insights into Drug Binding of Human PepT1

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    Yonca Ural-Blimke, Ali Flayhan, Jan Strauss, Vasileios Rantos, Kim Bartels, Rolf Nielsen, Els Pardon, Jan Steyaert, Jan Kosinski,
  • Esben M Quistgaard
  • Christian Löw

Members of the solute carrier 15 family (SLC15) transport di- and tripeptides as well as peptidomimetic drugs across the cell membrane. Structures of bacterial homologues have provided valuable information on the binding and transport of their natural substrates, but many do not transport medically relevant drugs. In contrast, a homologue from Escherichia coli, DtpA, shows a high similarity to human PepT1 (SLC15A1) in terms of ligand selectivity and transports a similar set of drugs. Here, we present the crystal structure of DtpA in ligand-free form (at 3.30 Å resolution) and in complex with the antiviral prodrug valganciclovir (at 2.65 Å resolution) supported by biochemical data. We show that valganciclovir unexpectedly binds with the ganciclovir moiety mimicking the N-terminal residue of a canonical peptide substrate. Based on a homology model we argue that this binding mode also applies to the human PepT1 transporter. Our results provide new insights into the binding mode of prodrugs and will assist the rational design of drugs with improved absorption rates.

TidsskriftJournal of the American Chemical Society
StatusE-pub ahead of print - 15 jan. 2019

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