Inactivation of Protein Farnesyltransferase by Active-Site-Targeted Dicarbonyl Compounds
摘要:
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.
Formation of multi-stereogenic centers using a catalytic diastereoselective Henry reaction
作者:Takayoshi Arai、Yoshinori Taneda、Yoko Endo
DOI:10.1039/c0cc03022h
日期:——
A diastereoselective Henry reaction of chiral aldehydes with nitroalkanes was developed using a chiral sulfonyldiamine (L1)-CuCl complex. The reaction of (R)-2-phenylpropanal and nitromethane was smoothly catalyzed by the (S,S,S)-L1-CuCl complex to give the adduct with 99/1 syn/anti selectivity in 99% ee. In the reaction of (S)-2-phenylpropanal and nitroethane, the (R,R,R)-L1-CuCl catalyst yielded
equimolar mixture of aldehyde and nitroalkane exclusively into β-nitroalcohols via the Henry reaction. Unlike most of the commonly used catalysts, polymersupported DMAP can be recovered by simple filtration and reused several times, thereby reducing the operational cost. High synthetic efficiency, total atom economy, near quantitative yields, mild reaction conditions, operational simplicity, easy recovery
An excellent yield of nitroalcohol was obtained within 15–30 minutes. No dehydrated product was observed. The catalyst used in these studies has the advantage of being a waste material and is hence low-cost, easily prepared, recyclable and environmentally friendly. In addition, the use of a biogenic renewable catalyst, itsatom economy, and roomtemperature and solvent-free reaction conditions and
Conjugated Nitro Alkene Anticancer Agents Based on Isoprenoid Metabolism
申请人:ROSE Seth D.
公开号:US20080113919A1
公开(公告)日:2008-05-15
Conjugated nitro alkene compounds hamper or prevent proliferation of cancer cells in cell culture and in cancer patients, which can result in a decrease in tumor size and/or disappearance of the cancer. The compounds may act by interference with cancer cell biochemistry, in which isoprenoid groups such as farnesyl and geranylgeranyl become bonded to various oncogenic proteins such as Ras, RhoA, RhoB, or some other growth-related cellular protein(s).