4p06 | pdb_00004p06

Bacterial arylsulfate sulfotransferase (ASST) H436N mutant with 4-methylumbelliferyl sulfate (MUS) in the active site

spinqualitylabelsall models 4p06, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4p06 is a 2 chain structure with sequence from Ecol6. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MUX, SO4 Related: 3ets, 3ett, 3elq, 4p04, 4p05, 4p07 Gene: assT, LF82_506 (ECOL6) Activity: Aryl-sulfate sulfotransferase, with EC number 2.8.2.22 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed 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. Structural and Mechanistic Insights into the PAPS-Independent Sulfotransfer Catalyzed by Bacterial Aryl Sulfotransferase and the Role of the DsbL/DsbI System in Its Folding.,Malojcic G, Owen RL, Glockshuber R Biochemistry. 2014 Mar 25;53(11):1870-7. doi: 10.1021/bi401725j. Epub 2014 Mar, 13. PMID:24601529 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Sulfotransferase

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