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Effects of mutations and glycosylations on STS activity: a site-directed mutagenesis study

Chloe Stengel1, Simon P Newman, Joanna M Day

  • 1Endocrinology and Metabolic Medicine and Sterix Ltd., Faculty of Medicine, Imperial College London, St. Mary's Hospital, London, W2 1NY, UK. c.stengel@imperial.ac.uk

Molecular and Cellular Endocrinology
|January 9, 2008
PubMed

Insights

Steroid sulphatase (STS) is crucial for active steroid formation. Understanding its structure and mutations, like those affecting Histidine 136, aids in developing targeted STS inhibitors for breast cancer treatment.

Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Steroid sulphatase (STS) converts inactive steroid sulphates to active steroids.
  • Elevated intra-tumoural STS mRNA correlates with poor prognosis in oestrogen receptor-positive breast cancer patients.

Purpose of the Study:

  • To investigate the structure-function relationship of the Steroid Sulphatase (STS) enzyme.
  • To identify key amino acid residues and glycosylation sites critical for STS activity.
  • To develop and characterize an antibody against human STS.

Main Methods:

  • Site-directed mutagenesis of STS protein constructs.
  • Enzymatic activity assays to measure STS function.
  • Immunoblot analysis to assess glycosylation.
  • Development and characterization of a polyclonal anti-STS antibody.

Main Results:

  • N- and C-terminal truncated STS proteins were inactive.
  • Histidine 136 is essential for STS catalytic activity, while Proline 212 is not.
  • Mutations at glycosylation sites N47 and N259 reduced STS activity, unlike N333 and N459.
  • All four N-linked glycosylation sites showed some degree of glycosylation.

Conclusions:

  • Specific amino acid residues and glycosylation sites significantly influence STS enzyme activity.
  • The developed anti-STS antibody can be a valuable tool for further research.
  • These findings provide insights for designing novel STS inhibitors for therapeutic applications.

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