• SURFE²R N1

    Easy-to-learn all-in-one device, ideal for teaching and university research
  • SURFE²R N1

    Finally label-free functional assays for transporters available
  • SURFE²R N1

    High signal amplification compared to patch-clamp: transport & binding assays
  • SURFE²R N1

    The only instrument on the market for SSM-based electrophysiology
  • SURFE²R N1

    Turn-key system for efficient transporter protein analysis

2009 - DtpB (YhiP) and DtpA (TppB, YdgR) are prototypical proton-dependent peptide transporters of Escherichia coli

Icon N1   SURFE²R ONE (a predecessor model of SURFE²R N1) publication in The FEBS Journal (2009)

Authors:
Harder D., Stolz J., Casagrande F., Obrdlik P., Weitz D., Fotiadis D., Daniel H.

Journal:
The FEBS Journal (2009) 275(13):3290-3298


Abstract:

The genome of Escherichia coli contains four genes assigned to the peptide transporter (PTR) family. Of these, only tppB (ydgR) has been characterized, and named tripeptide permease, whereas protein functions encoded by the yhiP, ybgH and yjdL genes have remained unknown. Here we describe the overexpression of yhiP as a His-tagged fusion protein in E. coli and show saturable transport of glycyl-sarcosine (Gly-Sar) with an apparent affinity constant of 6.5 mm. Overexpression of the gene also increased the susceptibility of cells to the toxic dipeptide alafosfalin. Transport was strongly decreased in the presence of a protonophore but unaffected by sodium depletion, suggesting H+-dependence. This was confirmed by purification of YhiP and TppB by nickel affinity chromatography and reconstitution into liposomes. Both transporters showed Gly-Sar influx in the presence of an artificial proton gradient and generated transport currents on a chip-based sensor. Competition experiments established that YhiP transported dipeptides and tripeptides. Western blot analysis revealed an apparent mass of YhiP of 40 kDa. Taken together, these findings show that yhiP encodes a protein that mediates proton-dependent electrogenic transport of dipeptides and tripeptides with similarities to mammalian PEPT1. On the basis of our results, we propose to rename YhiP as DtpB (dipeptide and tripeptide permease B), by analogy with the nomenclature in other bacteria. We also propose to rename TppB as DtpA, to better describe its function as the first protein of the PTR family characterized in E. coli.


Download here

Back to Overview

We use cookies on our website. Some of them are essential for the operation of the site, while others help us to improve this site and the user experience (tracking cookies). You can decide for yourself whether you want to allow cookies or not. Please note that if you reject them, you may not be able to use all the functionalities of the site.