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Volumn 10, Issue 9, 2009, Pages 1457-1461

Multiple pathways for the irreversible inhibition of steroid sulfatase with quinone methide-generating suicide inhibitors

Author keywords

Breast cancer therapy; Cance; Inhibitors; Steroid sulfatase; Steroids

Indexed keywords

ESTRONE SULFATE DERIVATIVE; HYMECROMONE SULFATE; QUINONE DERIVATIVE; QUINONE METHIDE; STERYL SULFATASE; UNCLASSIFIED DRUG;

EID: 70349559654     PISSN: 14394227     EISSN: 14397633     Source Type: Journal    
DOI: 10.1002/cbic.200900143     Document Type: Article
Times cited : (35)

References (20)
  • 4
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    • See the Supporting Information for details
    • See the Supporting Information for details.
  • 7
    • 0004006847 scopus 로고
    • Mechanism-Based Enzyme Inactivation and Enzymology
    • CRC, Boca Raton
    • R. B. Silverman, Mechanism-Based Enzyme Inactivation and Enzymology, Vol. 1: Chemistry and Enzymology, CRC, Boca Raton, 1988, p. 5.
    • (1988) Chemistry and Enzymology , vol.1 , pp. 5
    • Silverman, R.B.1
  • 9
    • 70349517730 scopus 로고    scopus 로고
    • This does not mean that no quinone methides are being produced outside the active site. Because 2- and 4-hydroxymethylestrone, the products resulting from the reaction of the quinone methides derived from inhibitors 1 and 3 with water, were readily detectable by HPLC (see the Supporting Information) then some partitioning of the quinone methides or their precursors out of the active site is occurring
    • This does not mean that no quinone methides are being produced outside the active site. Because 2- and 4-hydroxymethylestrone, the products resulting from the reaction of the quinone methides derived from inhibitors 1 and 3 with water, were readily detectable by HPLC (see the Supporting Information) then some partitioning of the quinone methides or their precursors out of the active site is occurring.
  • 12
    • 70349544762 scopus 로고    scopus 로고
    • This analysis treats the inactivation process as irreversible, which is reasonable because only a small amount of activity was recovered after 24 h of extensive dialysis
    • This analysis treats the inactivation process as irreversible, which is reasonable because only a small amount of activity was recovered after 24 h of extensive dialysis.
  • 13
    • 70349541716 scopus 로고    scopus 로고
    • An alternative explanation for the lag phase and results with β-ME is that quinone methide 9 is accumulating then entering the active site and inhibiting STS. However, it is very unlikely that such a highly reactive species would accumulate in solution to any appreciable extent
    • An alternative explanation for the lag phase and results with β-ME is that quinone methide 9 is accumulating then entering the active site and inhibiting STS. However, it is very unlikely that such a highly reactive species would accumulate in solution to any appreciable extent.
  • 14
    • 70349534935 scopus 로고    scopus 로고
    • We were unable to perform accurate studies with these inhibitors at concentrations greater than 10 μm due to the tendency of 2- and 4-FE1 to precipitate at higher concentrations. It is possible that 2-FE1 is an inhibitor of STS at concentrations greater than 10 μm.
    • We were unable to perform accurate studies with these inhibitors at concentrations greater than 10 μm due to the tendency of 2- and 4-FE1 to precipitate at higher concentrations. It is possible that 2-FE1 is an inhibitor of STS at concentrations greater than 10 μm.
  • 16
    • 0028227732 scopus 로고    scopus 로고
    • p-Difluoromethylphenol is known to be more stable than its monofluoro analogue, see: Q. Wang, U. Dechert, F. Jirik, S. G. Withers, Biochem. Biophys. Res. Commun. 1994, 200, 577; and references therein. Moreover, we were able to synthesize and isolate 4-difluoromethylestrone but we were unable to synthesize and isolate 4-monofluoromethylestrone.
    • p-Difluoromethylphenol is known to be more stable than its monofluoro analogue, see: Q. Wang, U. Dechert, F. Jirik, S. G. Withers, Biochem. Biophys. Res. Commun. 1994, 200, 577; and references therein. Moreover, we were able to synthesize and isolate 4-difluoromethylestrone but we were unable to synthesize and isolate 4-monofluoromethylestrone.
  • 18
    • 38849115865 scopus 로고    scopus 로고
    • While this work was in progress, Lu et al. reported the development of an activity-based probe for STS based on para-monofluoromethylphenyl sulfate. However, in addition to STS-labeling, nonspecific labeling of other proteins also occurred that was attributed to the quinone methide or its precursor being released from the active site. Our finding that all of the inhibitors reported here can partition out of the active site raises concerns as to the general utility of activity-based probes of this type for proteomic profiling, see: C.-P. Lu, C.-T. Ren, S.-H. Wu, C.-Y. Chu, L.-C. Lo, ChemBioChem 2007, 8, 2187
    • While this work was in progress, Lu et al. reported the development of an activity-based probe for STS based on para-monofluoromethylphenyl sulfate. However, in addition to STS-labeling, nonspecific labeling of other proteins also occurred that was attributed to the quinone methide or its precursor being released from the active site. Our finding that all of the inhibitors reported here can partition out of the active site raises concerns as to the general utility of activity-based probes of this type for proteomic profiling, see: C.-P. Lu, C.-T. Ren, S.-H. Wu, C.-Y. Chu, L.-C. Lo, ChemBioChem 2007, 8, 2187.
  • 19
    • 33750532080 scopus 로고    scopus 로고
    • This approach to sulfatase inhibition was also examined as a means of irreversibly inhibiting a sulfatase from P. aeruginosa (PARS) by using ortho- or para-difluoromethylphenyl sulfate. However, no irreversible inhibition was observed, see: S. R. Hanson, L. J. Whalen, C.-H. Wong, Bioorg. Med. Chem. 2006, 14, 8386
    • This approach to sulfatase inhibition was also examined as a means of irreversibly inhibiting a sulfatase from P. aeruginosa (PARS) by using ortho- or para-difluoromethylphenyl sulfate. However, no irreversible inhibition was observed, see: S. R. Hanson, L. J. Whalen, C.-H. Wong, Bioorg. Med. Chem. 2006, 14, 8386.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.