PTEN is a dual-specificity protein tyrosine phosphatase. As one of the central tumor suppressors, a thorough regulation of its activity is essential for proper cellular homeostasis. The precise implications of PTEN inhibition by reactive oxygen speci ...
PTEN is a dual-specificity protein tyrosine phosphatase. As one of the central tumor suppressors, a thorough regulation of its activity is essential for proper cellular homeostasis. The precise implications of PTEN inhibition by reactive oxygen species (e.g. H2 O2 ) and the subsequent structural consequences remain elusive. To study the effects of PTEN inhibition, bisperoxidovanadium (bpV) complexes serve as important tools with the potential for the treatment of nerve injury or cardiac ischemia. However, their mode of action is unknown, hampering further optimization and preventing therapeutic applications. Based on protein crystallography, mass spectrometry, and NMR spectroscopy, we elucidate the molecular basis of PTEN inhibition by H2O2 and bpV complexes. We show that both molecules inhibit PTEN via oxidative mechanisms resulting in the formation of the same intramolecular disulfide, therefore enabling the reactivation of PTEN under reductive conditions.
Organizational Affiliation:
Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14424 Potsdam (Germany).,Max Planck Institute of Molecular Physiology, Otto-Hahn-Strasse 11, Dortmund (Germany). tom.grossmann@cgc.mpg.de.,Chemical Genomics Centre of the Max Planck Society, Otto-Hahn-Strasse 15, 44227 Dortmund (Germany).,Max Planck Institute of Molecular Physiology, Otto-Hahn-Strasse 11, Dortmund (Germany).,VU University Amsterdam, Department of Chemistry & Pharmaceutical Sciences, De Boelelaan 1083, 1081 HV, Amsterdam (The Netherlands). tom.grossmann@cgc.mpg.de.,Chemical Genomics Centre of the Max Planck Society, Otto-Hahn-Strasse 15, 44227 Dortmund (Germany). tom.grossmann@cgc.mpg.de.,Technical University Dortmund, Department of Chemistry and Chemical Biology, Otto-Hahn-Strasse 6, 44227 Dortmund (Germany).,Technical University Dortmund, Department of Chemistry and Chemical Biology, Otto-Hahn-Strasse 6, 44227 Dortmund (Germany). tom.grossmann@cgc.mpg.de.
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