4US3

Crystal Structure of the bacterial NSS member MhsT in an Occluded Inward-Facing State


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.098 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

A Mechanism for Intracellular Release of Na+ by Neurotransmitter/Sodium Symporters

Malinauskaite, L.Quick, M.Reinhard, L.Lyons, J.A.Yano, H.Javitch, J.A.Nissen, P.

(2014) Nat.Struct.Mol.Biol. 21: 1006

  • DOI: 10.1038/nsmb.2894
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Neurotransmitter/sodium symporters (NSSs) terminate synaptic signal transmission by Na+-dependent reuptake of released neurotransmitters. Key conformational states have been reported for the bacterial homolog LeuT and an inhibitor-bound Drosophila do ...

    Neurotransmitter/sodium symporters (NSSs) terminate synaptic signal transmission by Na+-dependent reuptake of released neurotransmitters. Key conformational states have been reported for the bacterial homolog LeuT and an inhibitor-bound Drosophila dopamine transporter. However, a coherent mechanism of Na+-driven transport has not been described. Here, we present two crystal structures of MhsT, an NSS member from Bacillus halodurans, in occluded inward-facing states with bound Na+ ions and L-tryptophan, providing insight into the cytoplasmic release of Na+. The switch from outward- to inward-oriented states is centered on the partial unwinding of transmembrane helix 5, facilitated by a conserved GlyX9Pro motif that opens an intracellular pathway for water to access the Na2 site. We propose a mechanism, based on our structural and functional findings, in which solvation through the TM5 pathway facilitates Na+ release from Na2 and the transition to an inward-open state.


    Organizational Affiliation

    1] Danish Research Institute of Translational Neuroscience (DANDRITE), Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Aarhus, Denmark. [2] Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRANSPORTER
A
455Bacillus halodurans (strain ATCC BAA-125 / DSM 18197 / FERM 7344 / JCM 9153 / C-125)Mutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Amino Acid Secondary Transporters
Protein: 
MhsT multi-hydrophobic amino acid transporter, occluded inward-facing state
Find proteins for Q9KDT3 (Bacillus halodurans (strain ATCC BAA-125 / DSM 18197 / FERM 7344 / JCM 9153 / C-125))
Go to UniProtKB:  Q9KDT3
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
TRP
Query on TRP

Download SDF File 
Download CCD File 
A
TRYPTOPHAN
C11 H12 N2 O2
QIVBCDIJIAJPQS-VIFPVBQESA-N
 Ligand Interaction
BNG
Query on BNG

Download SDF File 
Download CCD File 
A
B-NONYLGLUCOSIDE
C15 H30 O6
QFAPUKLCALRPLH-UXXRCYHCSA-N
 Ligand Interaction
LMU
Query on LMU

Download SDF File 
Download CCD File 
A
DODECYL-ALPHA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-YHBSTRCHSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
TRPKd: 4800 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.098 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.191 
  • Space Group: P 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 44.280α = 90.00
b = 49.890β = 96.76
c = 110.050γ = 90.00
Software Package:
Software NamePurpose
PHENIXphasing
XDSdata reduction
PHENIXrefinement
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-09-24
    Type: Initial release
  • Version 1.1: 2014-10-08
    Type: Database references
  • Version 1.2: 2014-10-15
    Type: Database references
  • Version 1.3: 2014-11-19
    Type: Database references