3TYB

Dihydropteroate Synthase in complex with pHBA and DHP+


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 

wwPDB Validation 3D Report Full Report



Literature

Catalysis and sulfa drug resistance in dihydropteroate synthase.

Yun, M.K.Wu, Y.Li, Z.Zhao, Y.Waddell, M.B.Ferreira, A.M.Lee, R.E.Bashford, D.White, S.W.

(2012) Science 335: 1110-1114

  • DOI: 10.1126/science.1214641
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The sulfonamide antibiotics inhibit dihydropteroate synthase (DHPS), a key enzyme in the folate pathway of bacteria and primitive eukaryotes. However, resistance mutations have severely compromised the usefulness of these drugs. We report structural, ...

    The sulfonamide antibiotics inhibit dihydropteroate synthase (DHPS), a key enzyme in the folate pathway of bacteria and primitive eukaryotes. However, resistance mutations have severely compromised the usefulness of these drugs. We report structural, computational, and mutagenesis studies on the catalytic and resistance mechanisms of DHPS. By performing the enzyme-catalyzed reaction in crystalline DHPS, we have structurally characterized key intermediates along the reaction pathway. Results support an S(N)1 reaction mechanism via formation of a novel cationic pterin intermediate. We also show that two conserved loops generate a substructure during catalysis that creates a specific binding pocket for p-aminobenzoic acid, one of the two DHPS substrates. This substructure, together with the pterin-binding pocket, explains the roles of the conserved active-site residues and reveals how sulfonamide resistance arises.


    Organizational Affiliation

    Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Dihydropteroate synthaseA, B297Bacillus anthracis str. A2012Mutation(s): 0 
Gene Names: folPBAS0071BA_0071GBAA_0071
EC: 2.5.1.15
Find proteins for Q81VW8 (Bacillus anthracis)
Explore Q81VW8 
Go to UniProtKB:  Q81VW8
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
XHP
Query on XHP

Download CCD File 
A, B
2-amino-6-methylidene-6,7-dihydropteridin-4(3H)-one
C7 H7 N5 O
CHIXTMVYEYYHIG-UHFFFAOYSA-N
 Ligand Interaction
PHB
Query on PHB

Download CCD File 
A, B
P-HYDROXYBENZOIC ACID
C7 H6 O3
FJKROLUGYXJWQN-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 
  • Space Group: P 62 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.676α = 90
b = 98.676β = 90
c = 264.297γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
SERGUIdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-14
    Type: Initial release