4IU9

Crystal structure of a membrane transporter


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.005 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.261 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structure and mechanism of a nitrate transporter.

Yan, H.Huang, W.Yan, C.Gong, X.Jiang, S.Zhao, Y.Wang, J.Shi, Y.

(2013) Cell Rep 3: 716-723

  • DOI: 10.1016/j.celrep.2013.03.007
  • Primary Citation of Related Structures:  4IU8

  • PubMed Abstract: 
  • The nitrate/nitrite transporters NarK and NarU play an important role in nitrogen homeostasis in bacteria and belong to the nitrate/nitrite porter family (NNP) of the major facilitator superfamily (MFS) fold. The structure and functional mechanism of ...

    The nitrate/nitrite transporters NarK and NarU play an important role in nitrogen homeostasis in bacteria and belong to the nitrate/nitrite porter family (NNP) of the major facilitator superfamily (MFS) fold. The structure and functional mechanism of NarK and NarU remain unknown. Here, we report the crystal structure of NarU at a resolution of 3.1 Å and systematic biochemical characterization. The two molecules of NarU in an asymmetric unit exhibit two distinct conformational states: occluded and partially inward-open. The substrate molecule nitrate appears to be coordinated by four highly conserved, charged, or polar amino acids. Structural and biochemical analyses allowed the identification of key amino acids that are involved in substrate gating and transport. The observed conformational differences of NarU, together with unique sequence features of the NNP family transporters, suggest a transport mechanism that might deviate from the canonical rocker-switch model.


    Organizational Affiliation

    Ministry of Education Key Laboratory of Protein Science, Tsinghua University, Beijing 100084, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Nitrite extrusion protein 2
B, A
468Escherichia coli (strain K12)Gene Names: narU (yddF)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Major Facilitator Superfamily (MFS) Transporters
Protein: 
NarU nitrate transporter
Find proteins for P37758 (Escherichia coli (strain K12))
Go to UniProtKB:  P37758
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.005 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.261 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 117.439α = 90.00
b = 118.211β = 90.00
c = 127.056γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
ADSCdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-17
    Type: Initial release