4P04

Apo form of bacterial arylsulfate sulfotransferase (ASST) H436N mutant with MPO in the active site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.167 
  • R-Value Work: 0.150 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Structural and mechanistic insights into the PAPS-independent sulfotransfer catalyzed by bacterial aryl sulfotransferase and the role of the DsbL/Dsbl system in its folding.

Malojcic, G.Owen, R.L.Glockshuber, R.

(2014) Biochemistry 53: 1870-1877

  • DOI: 10.1021/bi401725j
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Bacterial aryl sulfotransferases (ASSTs) catalyze sulfotransfer from a phenolic sulfate to a phenol. These enzymes are frequently found in pathogens and upregulated during infection. Their mechanistic understanding is very limited, and their natural ...

    Bacterial aryl sulfotransferases (ASSTs) catalyze sulfotransfer from a phenolic sulfate to a phenol. These enzymes are frequently found in pathogens and upregulated during infection. Their mechanistic understanding is very limited, and their natural substrates are unknown. Here, the crystal structures of Escherichia coli CFT073 ASST trapped in its presulfurylation state with model donor substrates bound in the active site are reported, which reveal the molecular interactions governing substrate recognition. Furthermore, spectroscopic titrations with donor substrates and sulfurylation kinetics of ASST illustrate that this enzyme binds substrates in a 1:1 stoichiometry and that the active sites of the ASST homooligomer act independently. Mass spectrometry and crystallographic experiments of ASST incubated with human urine demonstrate that urine contains a sulfuryl donor substrate. In addition, we examined the capability of the two paralogous dithiol oxidases present in uropathogenic E. coli CFT073, DsbA, and the ASST-specific enzyme DsbL, to introduce the single, conserved disulfide bond into ASST. We show that DsbA and DsbL introduce the disulfide bond into unfolded ASST at similar rates. Hence, a chaperone effect of DsbL, not present in DsbA, appears to be responsible for the dependence of efficient ASST folding on DsbL in vivo. The conservation of paralogous dithiol oxidases with different substrate specificities in certain bacterial strains may therefore be a consequence of the complex folding pathways of their substrate proteins.


    Organizational Affiliation

    Institute of Molecular Biology and Biophysics, ETH Zurich , CH-8093 Zurich, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Arylsulfate sulfotransferase AssT
A, B
571Escherichia coliMutation(s): 1 
Gene Names: assT
EC: 2.8.2.22
Find proteins for A0A0D6H805 (Escherichia coli)
Go to UniProtKB:  A0A0D6H805
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
MPO
Query on MPO

Download SDF File 
Download CCD File 
A, B
3[N-MORPHOLINO]PROPANE SULFONIC ACID
C7 H15 N O4 S
DVLFYONBTKHTER-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.167 
  • R-Value Work: 0.150 
  • Space Group: P 32 1 2
Unit Cell:
Length (Å)Angle (°)
a = 181.486α = 90.00
b = 181.486β = 90.00
c = 99.602γ = 120.00
Software Package:
Software NamePurpose
XDSdata scaling
REFMACrefinement
PHENIXrefinement
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Schweizerische Nationalfonds and ETH Zurich in the framework of the NCCR Structural Biology programSwitzerland--

Revision History 

  • Version 1.0: 2014-03-26
    Type: Initial release
  • Version 1.1: 2014-08-06
    Type: Derived calculations
  • Version 1.2: 2014-10-01
    Type: Database references
  • Version 1.3: 2017-09-27
    Type: Advisory, Database references, Derived calculations, Other, Refinement description, Source and taxonomy
  • Version 1.4: 2017-11-01
    Type: Author supporting evidence