1TLZ

Tsx structure complexed with uridine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.276 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the bacterial nucleoside transporter Tsx.

Ye, J.Van Den Berg, B.

(2004) Embo J. 23: 3187-3195

  • DOI: 10.1038/sj.emboj.7600330
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Tsx is a nucleoside-specific outer membrane (OM) transporter of Gram-negative bacteria. We present crystal structures of Escherichia coli Tsx in the absence and presence of nucleosides. These structures provide a mechanism for nucleoside transport ac ...

    Tsx is a nucleoside-specific outer membrane (OM) transporter of Gram-negative bacteria. We present crystal structures of Escherichia coli Tsx in the absence and presence of nucleosides. These structures provide a mechanism for nucleoside transport across the bacterial OM. Tsx forms a monomeric, 12-stranded beta-barrel with a long and narrow channel spanning the outer membrane. The channel, which is shaped like a keyhole, contains several distinct nucleoside-binding sites, two of which are well defined. The base moiety of the nucleoside is located in the narrow part of the keyhole, while the sugar occupies the wider opening. Pairs of aromatic residues and flanking ionizable residues are involved in nucleoside binding. Nucleoside transport presumably occurs by diffusion from one binding site to the next.


    Organizational Affiliation

    Department of Cell Biology, Howard Hughes Medical Institute and Harvard Medical School, Boston, MA 02115, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Nucleoside-specific channel-forming protein tsx
A, B
278Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: tsx (nupA)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric
Protein: 
Tsx nucleoside transporter (apoprotein)
Find proteins for P0A927 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A927
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
URI
Query on URI

Download SDF File 
Download CCD File 
A, B
URIDINE
C9 H12 N2 O6
DRTQHJPVMGBUCF-XVFCMESISA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.276 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 149.861α = 90.00
b = 149.861β = 90.00
c = 120.849γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SOLVEphasing
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-24
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance