Inactivation of Protein Farnesyltransferase by Active-Site-Targeted Dicarbonyl Compounds
作者:Karl J. Okolotowicz、Wei-Jen Lee、Rosemarie F. Hartman、Ann Y. Kim、Steven R. Ottersberg、Dale E. Robinson, Jr.、Scott R. Lefler、Seth D. Rose
DOI:10.1002/1521-4184(200106)334:6<194::aid-ardp194>3.0.co;2-m
日期:2001.6
Upon farnesylation by protein farnesyltransferase (FTase), key proteins become compartmentalized in cells. For example, cell membrane localization is essential for the mitogenic role of mutant Ras protein, which acts as a switch for cancer cell proliferation. We repel? that alpha -dicarbonyl compounds derived from the isoprenoid skeleton or other hydrophobic groups potently obstruct farnesylation of a Ras model peptide by human recombinant FTase in vitro. A geranyl-derived isoprenoid diketone, 5.9-dimethyl-8-decene-2,3-dione, at 17 muM caused a 62% reduction in FTase activity after 30 minutes. A farnesyl-derived isoprenoid diketone, 5,9,13-trimethyl-8,12-tetradecadiene-2,3-dione, at 93 muM caused a 94% reduction after 30 minutes. Other dicarbonyl:compounds found to be effective against FTase in vitro were (+/-)-6-(camphorquinone-10-sulfonamido)-hexanoic acid, 4,4 ' -biphenyldiglyoxaldehyde, dehydroascorbic acid 6-palmitace, 2-oxododecanal, and phenylglyoxal. Higher concentrations of the alpha -dicarbonyl compound resulted in more rapid and more extensive inactivation. These findings demonstrate that ct-dicarbonyl compounds targeted to FTase interfere with protein farnesylation in vitro and may,lead to derivatives that have utility as chemotherapeutic agents.