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Related Experiment Videos

Three-dimensional structures of sulfatases.

Debashis Ghosh1

  • 1Department of Structural Biology, Hauptman-Woodward Medical Research Institute, Buffalo, New York, USA.

Methods in Enzymology
|January 10, 2006
PubMed
Summary
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Sulfatase enzymes, crucial for breaking sulfate bonds, are involved in genetic disorders. Structural analysis of human sulfatases, including steroid sulfatase (ES), reveals insights into their catalytic mechanisms and disease associations.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Sulfatases catalyze sulfate ester hydrolysis, with nine human forms identified.
  • Many sulfatases are linked to genetic disorders due to reduced or lost enzyme function.
  • A conserved catalytic cysteine residue is post-translationally modified to formylglycine, essential for activity.

Purpose of the Study:

  • To compare and contrast the crystal structures of four sulfatases: human arylsulfatases A, B, and C (steroid sulfatase), and bacterial arylsulfatase.
  • To re-evaluate the catalytic mechanism of sulfatases using structural and functional data.
  • To investigate the structural basis of steroid sulfatase (ES) function and its role in X-linked ichthyosis.

Main Methods:

  • X-ray crystallography was used to determine the structures of human arylsulfatases A, B, and C (steroid sulfatase), and bacterial arylsulfatase.

Related Experiment Videos

  • Comparative structural analysis of the four enzymes.
  • Mapping of genetic mutations onto the steroid sulfatase structure.

    • Main Results:

    • Crystal structures of three human sulfatases (ARSA, ARSB, ES) and a bacterial homolog (PAS) were analyzed.
    • Differences in structure were observed between water-soluble sulfatases (ARSA, ARSB, PAS) and the membrane-bound steroid sulfatase (ES).
    • The active site of ES showed substrate-specific interactions, and mutations causing X-linked ichthyosis were mapped to its structure.

    Conclusions:

    • Structural comparisons provide insights into sulfatase catalytic mechanisms and substrate interactions.
    • The hydrophobic domain of ES suggests a membrane-bound function, potentially influenced by the lipid bilayer.
    • Structural analysis explains the loss of enzyme function in X-linked ichthyosis due to specific mutations in ES.