4TPH image
Entry Detail
PDB ID:
4TPH
Title:
Selectivity mechanism of a bacterial homologue of the human drug peptide transporters PepT1 and PepT2
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-06-07
Release Date:
2014-07-09
Method Details:
Experimental Method:
Resolution:
3.16 Å
R-Value Free:
0.30
R-Value Work:
0.25
R-Value Observed:
0.25
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Proton:oligopeptide symporter POT family
Chain IDs:A, B
Chain Length:523
Number of Molecules:2
Biological Source:Shewanella oneidensis
Primary Citation
Selectivity mechanism of a bacterial homolog of the human drug-peptide transporters PepT1 and PepT2.
Nat.Struct.Mol.Biol. 21 728 ? (2014)
PMID: 25064511 DOI: 10.1038/nsmb.2860

Abstact

Peptide transporters of the PepT family have key roles in the transport of di- and tripeptides across membranes as well as in the absorption of orally administered drugs in the small intestine. We have determined structures of a PepT transporter from Shewanella oneidensis (PepT(So2)) in complex with three different peptides. The peptides bind in a large cavity lined by residues that are highly conserved in human PepT1 and PepT2. The bound peptides adopt extended conformations with their N termini clamped into a conserved polar pocket. A positively charged patch allows differential interactions with the C-terminal carboxylates of di- and tripeptides. Here we identify three pockets for peptide side chain interactions, and our binding studies define differential roles of these pockets for the recognition of different subtypes of peptide side chains.

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Primary Citation of related structures