Synthesis and biochemical evaluation of novel and potent inhibitors of the enzyme oestrone sulphatase (ES).
In an effort to investigate the structural requirements for the inhibition of the enzyme oestrone sulphatase (ES), we have previously undertaken extensive structure-activity relationship studies. Using the data from molecular modelling and structure-activity relationship determination studies, we have designed a number of compounds based upon 4-sulphamated phenyl ketones. Here, we report the results of our study into a series of these compounds as potential inhibitors of ES. The results of the study show that these compounds are potent inhibitors the possessing greater inhibitory activity than 4-methylcoumarin-7-O-sulphamate derivative (COUMATE) (a potent non-steroidal inhibitor), but are weaker than oestrone-3-sulphamate (EMATE) and the recently reported 667- and 669-COUMATE, however, they provide good lead compounds in the search for potent inhibitors of ES. Furthermore, the compounds are observed to be irreversible inhibitors. From the consideration of the structure-activity relationship of these novel compounds, we have attempted to rationalise the significance of the log P factor in the inhibition of ES and suggest that a log P requirement of approximately 3.5 aids the inhibition through the rapid expulsion of the carbon backbone from the active site. We also propose that the same factor is responsible for the hydrolysis of oestrone sulphate reaction, appearing to be an irreversible process.
Ahmed
Sabbir
S
School of Chemical and Pharmaceutical Sciences, Kingston University, Penrhyn Road, Kingston upon Thames, Surrey KT1 2EE, UK. s.ahmed@kingston.ac.uk
James
Karen
K
Owen
Caroline P
CP
Patel
Chirag K
CK
D003374:Coumarins / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004791:Enzyme Inhibitors / Q000737:chemistry* / Q000494:pharmacology*; D004970:Estrone / Q000031:analogs & derivatives* / Q000494:pharmacology*; D006801:Humans; D006868:Hydrolysis; D020128:Inhibitory Concentration 50; D007700:Kinetics; D008861:Microsomes / Q000187:drug effects*; D008956:Models, Chemical; D010920:Placenta / Q000187:drug effects*; D013055:Spectrophotometry, Infrared; D013429:Sulfatases / Q000037:antagonists & inhibitors* / Q000737:chemistry*; D013449:Sulfonamides / Q000494:pharmacology*; D013997:Time Factors
C100463:4-methylcoumarin 7-O-sulfamate; D003374:Coumarins; D004791:Enzyme Inhibitors; D013449:Sulfonamides; C088768:estrone-3-O-sulfamate; D004970:Estrone; D013429:Sulfatases; C020121:estrone sulfatase