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a) S. J. Stanway, P. Delavault, A. Purohit, L. W. Woo, C. Thurieau, B. V. Potter, M. J. Reed, Oncologist 2007, 12, 370-374
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Y. Liu, I.-F. Lien, S. Ruttgaizer, P. Dove, S. D. Taylor, Org. Lett. 2004, 6, 209.
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Liu, Y.1
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4
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70349543488
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See the Supporting Information for details
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See the Supporting Information for details.
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5
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35948995254
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Y. Liu, B. Kim, S. D. Taylor, J. Org. Chem. 2007, 72, 8824.
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7
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0004006847
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Mechanism-Based Enzyme Inactivation and Enzymology
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CRC, Boca Raton
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R. B. Silverman, Mechanism-Based Enzyme Inactivation and Enzymology, Vol. 1: Chemistry and Enzymology, CRC, Boca Raton, 1988, p. 5.
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Chemistry and Enzymology
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Silverman, R.B.1
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9
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70349517730
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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
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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.
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10
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0029109780
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C. Anderson, J. Freeman, L. J. H. Lucas, T. S. Widlanski, J. Am. Chem. Soc. 1995, 117, 3889.
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Anderson, C.1
Freeman, J.2
Lucas, L.J.H.3
Widlanski, T.S.4
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11
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16844384600
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For example see
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For example see: C. Dax, M. Coincon, J. Sygusch, C. Blonski, Biochemistry 2005, 44, 5430.
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(2005)
Biochemistry
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Dax, C.1
Coincon, M.2
Sygusch, J.3
Blonski, C.4
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12
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70349544762
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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
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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.
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13
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70349541716
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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
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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.
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14
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70349534935
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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.
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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.
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15
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0038265006
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F. G. Hernandez-Guzman, T. Higashiyama, W. Pangborn, Y. Osawa, D. Ghosh, J. Biol. Chem. 2003, 278, 22989.
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Hernandez-Guzman, F.G.1
Higashiyama, T.2
Pangborn, W.3
Osawa, Y.4
Ghosh, D.5
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16
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0028227732
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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.
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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.
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17
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7244245609
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and references therein
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M. Kurogochi, S.-I. Nishamura, Y. C. Lee, J. Biol. Chem. 2004, 279, 44704; and references therein.
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J. Biol. Chem
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Kurogochi, M.1
Nishamura, S.-I.2
Lee, Y.C.3
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18
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38849115865
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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
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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.
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19
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33750532080
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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
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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.
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20
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0034676325
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R. P. Boivin, V. Luu-The, R. Lachance, F. Labrie, D. Poirier, J. Med. Chem. 2000, 43, 4465.
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J. Med. Chem
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Boivin, R.P.1
Luu-The, V.2
Lachance, R.3
Labrie, F.4
Poirier, D.5
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