3CHG

The compatible solute-binding protein OpuAC from Bacillus subtilis in complex with DMSA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.359 
  • R-Value Work: 0.285 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The Compatible-Solute-Binding Protein OpuAC from Bacillus subtilis: Ligand Binding, Site-Directed Mutagenesis, and Crystallographic Studies

Smits, S.H.J.Hoing, M.Lecher, J.Jebbar, M.Schmitt, L.Bremer, E.

(2008) J.Bacteriol. 190: 5663-5671

  • DOI: 10.1128/JB.00346-08

  • PubMed Abstract: 
  • In the soil bacterium Bacillus subtilis, five transport systems work in concert to mediate the import of various compatible solutes that counteract the deleterious effects of increases in the osmolarity of the environment. Among these five systems, t ...

    In the soil bacterium Bacillus subtilis, five transport systems work in concert to mediate the import of various compatible solutes that counteract the deleterious effects of increases in the osmolarity of the environment. Among these five systems, the ABC transporter OpuA, which catalyzes the import of glycine betaine and proline betaine, has been studied in detail in the past. Here, we demonstrate that OpuA is capable of importing the sulfobetaine dimethylsulfonioacetate (DMSA). Since OpuA is a classic ABC importer that relies on a substrate-binding protein priming the transporter with specificity and selectivity, we analyzed the OpuA-binding protein OpuAC by structural and mutational means with respect to DMSA binding. The determined crystal structure of OpuAC in complex with DMSA at a 2.8-A resolution and a detailed mutational analysis of these residues revealed a hierarchy within the amino acids participating in substrate binding. This finding is different from those for other binding proteins that recognize compatible solutes. Furthermore, important principles that enable OpuAC to specifically bind various compatible solutes were uncovered.


    Organizational Affiliation

    Institute of Biochemistry, Heinrich Heine University Düesseldorf, Universitätsstr. 1, 40225 Düsseldorf, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glycine betaine-binding protein
D, A, B, C
268Bacillus subtilis (strain 168)Mutation(s): 0 
Gene Names: opuAC
Find proteins for P46922 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P46922
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
313
Query on 313

Download SDF File 
Download CCD File 
A, B, C, D
(dimethyl-lambda~4~-sulfanyl)acetic acid
C4 H10 O2 S
GBHLSDCOGOHDJL-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
313Kd: 102000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.359 
  • R-Value Work: 0.285 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 56.508α = 90.00
b = 150.606β = 104.54
c = 58.959γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
AMoREphasing
XDSdata reduction
REFMACrefinement
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-08-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance