4AQ4

substrate bound sn-glycerol-3-phosphate binding periplasmic protein ugpB from Escherichia coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.164 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Determinants of Substrate Specificity and Biochemical Properties of the Sn-Glycerol-3-Phosphate ATP Binding Cassette Transporter (Ugpb-Aec(2) ) of Escherichia Coli.

Wuttge, S.Bommer, M.Jager, F.Martins, B.M.Jacob, S.Licht, A.Scheffel, F.Dobbek, H.Schneider, E.

(2012) Mol Microbiol 86: 908

  • DOI: 10.1111/mmi.12025
  • Primary Citation of Related Structures:  
    4AQ4

  • PubMed Abstract: 
  • Under phosphate starvation conditions, Escherichia coli can utilize sn-glycerol-3-phosphate (G3P) and G3P diesters as phosphate source when transported by an ATP binding cassette importer composed of the periplasmic binding protein, UgpB, the transmembrane subunits, UgpA and UgpE, and a homodimer of the nucleotide binding subunit, UgpC ...

    Under phosphate starvation conditions, Escherichia coli can utilize sn-glycerol-3-phosphate (G3P) and G3P diesters as phosphate source when transported by an ATP binding cassette importer composed of the periplasmic binding protein, UgpB, the transmembrane subunits, UgpA and UgpE, and a homodimer of the nucleotide binding subunit, UgpC. The current knowledge on the Ugp transporter is solely based on genetic evidence and transport assays using intact cells. Thus, we set out to characterize its properties at the level of purified protein components. UgpB was demonstrated to bind G3P and glycerophosphocholine with dissociation constants of 0.68 ± 0.02 μM and 5.1 ± 0.3 μM, respectively, while glycerol-2-phosphate (G2P) is not a substrate. The crystal structure of UgpB in complex with G3P was solved at 1.8 Å resolution and revealed the interaction with two tryptophan residues as key to the preferential binding of linear G3P in contrast to the branched G2P. Mutational analysis validated the crucial role of Trp-169 for G3P binding. The purified UgpAEC2 complex displayed UgpB/G3P-stimulated ATPase activity in proteoliposomes that was neither inhibited by phosphate nor by the signal transducing protein PhoU or the phosphodiesterase UgpQ. Furthermore, a hybrid transporter composed of MalFG-UgpC could be functionally reconstituted while a UgpAE-MalK complex was unstable.


    Organizational Affiliation

    Division of Microbial Physiology, Humboldt-Universität zu Berlin, Unter den Linden 6, D-10099, Berlin, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SN-GLYCEROL-3-PHOSPHATE-BINDING PERIPLASMIC PROTEIN UGPBA419Escherichia coli K-12Mutation(s): 0 
Gene Names: ugpBb3453JW3418
UniProt
Find proteins for P0AG80 (Escherichia coli (strain K12))
Explore P0AG80 
Go to UniProtKB:  P0AG80
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
G3P (Subject of Investigation/LOI)
Query on G3P

Download Ideal Coordinates CCD File 
B [auth A]SN-GLYCEROL-3-PHOSPHATE
C3 H9 O6 P
AWUCVROLDVIAJX-GSVOUGTGSA-N
 Ligand Interaction
CD
Query on CD

Download Ideal Coordinates CCD File 
E [auth A]CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
C [auth A], D [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CO
Query on CO

Download Ideal Coordinates CCD File 
F [auth A]COBALT (II) ION
Co
XLJKHNWPARRRJB-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
G [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
G3P Binding MOAD:  4AQ4 Kd: 680 (nM) from 1 assay(s)
PDBBind:  4AQ4 Kd: 680 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.164 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.346α = 90
b = 49.346β = 90
c = 406.894γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-17
    Type: Initial release
  • Version 1.1: 2013-07-17
    Changes: Database references
  • Version 1.2: 2019-03-06
    Changes: Advisory, Data collection, Experimental preparation, Other