2XUT

Crystal structure of a proton dependent oligopeptide (POT) family transporter.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.62 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.277 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal Structure of a Prokaryotic Homologue of the Mammalian Oligopeptide-Proton Symporters, Pept1 and Pept2.

Newstead, S.Drew, D.Cameron, A.D.Postis, V.L.Xia, X.Fowler, P.W.Ingram, J.C.Carpenter, E.P.Sansom, M.S.P.McPherson, M.J.Baldwin, S.A.Iwata, S.

(2011) Embo J. 30: 417

  • DOI: 10.1038/emboj.2010.309

  • PubMed Abstract: 
  • PepT1 and PepT2 are major facilitator superfamily (MFS) transporters that utilize a proton gradient to drive the uptake of di- and tri-peptides in the small intestine and kidney, respectively. They are the major routes by which we absorb dietary nitr ...

    PepT1 and PepT2 are major facilitator superfamily (MFS) transporters that utilize a proton gradient to drive the uptake of di- and tri-peptides in the small intestine and kidney, respectively. They are the major routes by which we absorb dietary nitrogen and many orally administered drugs. Here, we present the crystal structure of PepT(So), a functionally similar prokaryotic homologue of the mammalian peptide transporters from Shewanella oneidensis. This structure, refined using data up to 3.6 Å resolution, reveals a ligand-bound occluded state for the MFS and provides new insights into a general transport mechanism. We have located the peptide-binding site in a central hydrophilic cavity, which occludes a bound ligand from both sides of the membrane. Residues thought to be involved in proton coupling have also been identified near the extracellular gate of the cavity. Based on these findings and associated kinetic data, we propose that PepT(So) represents a sound model system for understanding mammalian peptide transport as catalysed by PepT1 and PepT2.


    Organizational Affiliation

    Division of Molecular Biosciences, Membrane Protein Crystallography Group, Imperial College London, London, UK. simon.newstead@bioch.ox.ac.uk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTON/PEPTIDE SYMPORTER FAMILY PROTEIN
A, B, C
524Shewanella oneidensis (strain MR-1)Mutation(s): 2 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Major Facilitator Superfamily (MFS) Transporters
Protein: 
PepTSo Oligopeptide-proton symporter (POT family)
Find proteins for Q8EKT7 (Shewanella oneidensis (strain MR-1))
Go to UniProtKB:  Q8EKT7
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.62 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.277 
  • Space Group: P 32
Unit Cell:
Length (Å)Angle (°)
a = 159.400α = 90.00
b = 159.400β = 90.00
c = 152.940γ = 120.00
Software Package:
Software NamePurpose
BUSTERrefinement
SCALEPACKdata scaling
DENZOdata reduction
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-12-15
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-24
    Type: Source and taxonomy