Enzymes
| UniProtKB help_outline | 1,110 proteins |
Reaction participants Show >> << Hide
- Name help_outline glycyl-L-aspartate Identifier CHEBI:191204 Charge -1 Formula C6H9N2O5 InChIKeyhelp_outline SCCPDJAQCXWPTF-VKHMYHEASA-M SMILEShelp_outline [NH3+]CC(=O)N[C@@H](CC([O-])=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,932 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:71687 | RHEA:71688 | RHEA:71689 | RHEA:71690 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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PEPT1 as a paradigm for membrane carriers that mediate electrogenic bidirectional transport of anionic, cationic, and neutral substrates.
Kottra G., Stamfort A., Daniel H.
The capability for electrogenic inward transport of substrates that carry different net charge is a phenomenon observed in a variety of membrane-solute transporters but is not yet understood. We employed the two-electrode voltage clamp technique combined with intracellular pH recordings and the gi ... >> More
The capability for electrogenic inward transport of substrates that carry different net charge is a phenomenon observed in a variety of membrane-solute transporters but is not yet understood. We employed the two-electrode voltage clamp technique combined with intracellular pH recordings and the giant patch technique to assess the selectivity for bidirectional transport and the underlying stoichiometries in proton to substrate flux coupling for electrogenic transfer of selected anionic, cationic, and neutral dipeptides by the intestinal peptide transporter PEPT1. Anionic dipeptides such as Gly-Asp and Asp-Gly are transported in their neutral and negatively charged forms with high and low affinities, respectively. The positive transport current obtained with monoanionic substrates results from the cotransport of two protons. Cationic dipeptides can be transported in neutral and positively charged form, resulting in an excess transport current as compared with neutral substrates. However, binding and transport of cationic dipeptides shows a pronounced selectivity for the position of charged side chains demonstrating that the binding domain of PEPT1 is asymmetric, both in its inward and outward facing conformation. The simultaneous presence of identically charged substrates on both membrane surfaces generates outward and, unexpectedly, enhanced inward transport currents probably by increasing the turnover rate. << Less
J. Biol. Chem. 277:32683-32691(2002) [PubMed] [EuropePMC]
This publication is cited by 3 other entries.