Bacterial aryl sulfotransferase (ASST) soaked with human urine

Experimental Data Snapshot

  • Resolution: 2.59 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 

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This is version 1.4 of the entry. See complete history


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: https://doi.org/10.1021/bi401725j
  • Primary Citation of Related Structures:  
    4P04, 4P05, 4P06, 4P07

  • 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 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Arylsulfate sulfotransferase AssT
A, B
571Escherichia coli CFT073Mutation(s): 0 
Gene Names: assTLF82_506
Find proteins for A0A0D6H805 (Escherichia coli)
Explore A0A0D6H805 
Go to UniProtKB:  A0A0D6H805
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0D6H805
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.59 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 
  • Space Group: P 32 1 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 182.295α = 90
b = 182.295β = 90
c = 101.592γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-03-26
    Type: Initial release
  • Version 1.1: 2014-10-01
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Advisory, Database references, Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary
  • Version 1.3: 2017-11-01
    Changes: Author supporting evidence
  • Version 1.4: 2023-09-27
    Changes: Advisory, Data collection, Database references, Refinement description