Design, Synthesis, and Evaluation of Phospholipid Analogs as Inhibitors of the Bacterial Phospholipase C from Bacillus cereus
摘要:
Enzymes belonging to the phospholipase C (PLC) family hydrolyze the phosphodiester bond of phospholipids to give a diacylglycerol and a phosphorylated head group. The bacterial phospholipase C from Bacillus cereus (PLC(Bc)) has been studied extensively, and there is a wealth of information regarding those structural features that are important for substrate activity. In contrast, there is virtually no data available regarding structure-activity relationships for inhibitors of this enzyme. To address this shortcoming, a series of optically pure analogues of 1,2-dihexanoyl-sn-glycero-3-phosphocholine (2) containing different replacements of the phosphate group were first synthesized including the phosphoramidates 4 and 8, the phosphonate 5, the (difluoromethylene)phosphonate 6, the thiophosphate 7, the diastereomeric phosphorothioates 9 and 10, and the phosphorodithioate 11. Each of these phosphatidylcholine derivatives was tested for inhibitor or substrate activity with PLC(Bc) using the water-soluble phosphatidylcholine 2 as the monomeric substrate. The measurements were conducted below the critical micellar concentrations of both 2 and the inhibitor. Of the analogues, only 7 and 9 underwent observable enzymatic hydrolysis under the assay conditions used. The k(cat) of the (Sp)-phosphorothioate 9 was approximately one-fifth that of 2, and when compared to 2, 7 was hydrolyzed only very slowly by the enzyme. Kinetic studies indicated that the phospholipid analogues tested were competitive inhibitors with increasing K-i's follows: 7 approximate to 11 approximate to 10 < 4 approximate to 8 < 5 approximate to 6.
Activation of mTOR signaling by novel fluoromethylene phosphonate analogues of phosphatidic acid
作者:Yong Xu、Yimin Fang、Jie Chen、Glenn D. Prestwich
DOI:10.1016/j.bmcl.2004.01.020
日期:2004.3
Phosphonate analogues of phosphatidicacid (PA) were synthesized in which the bridging oxygen was replaced by an alpha-monofluoromethylene (-CHF-) or alpha-difluoromethylene (-CF(2)-) moiety using hydrolytic kinetic resolution (HKR) of a racemic epoxide as the key step. Since PA activates signaling in the mTOR (mammalian target of rapamycin) pathway, these metabolically stabilized PA analogues were evaluated
Synthesis of Chiral (α,α-Difluoroalkyl)phosphonate Analogues of (Lyso)phosphatidic Acid via Hydrolytic Kinetic Resolution
作者:Yong Xu、Glenn D. Prestwich
DOI:10.1021/ol026684s
日期:2002.11.1
alpha-difluoroalkyl)phosphonates were obtained after selective esterification and deprotection of the corresponding phosphonates. These compounds are novel phosphatase-resistant analogues of lysophosphatidic acid and phosphatidicacid. [reaction: see text]
Analogs of lysophosphatidic acid and methods of making and using thereof
申请人:Prestwich D. Glenn
公开号:US20070123492A1
公开(公告)日:2007-05-31
Described herein are analogs of lysophosphatidic acid. Also described herein are methods of making and using analogs of lysophosphatidic acid.
本文描述了溶血磷脂酸的类似物。本文还描述了制备和使用溶血磷脂酸类似物的方法。
[EN] ANALOGS OF LYSOPHOSPHATIDIC ACID AND METHODS OF MAKING AND USING THEREOF<br/>[FR] ANALOGUES D'ACIDE LYSOPHOSPHATIDIQUE ET PROCEDES DE LEUR FABRICATION ET DE LEUR UTILISATION
申请人:UNIV UTAH RES FOUND
公开号:WO2004092188A3
公开(公告)日:2005-04-28
Design, Synthesis, and Evaluation of Phospholipid Analogs as Inhibitors of the Bacterial Phospholipase C from Bacillus cereus
作者:Stephen F. Martin、Yue-Ling Wong、Allan S. Wagman
DOI:10.1021/jo00096a024
日期:1994.8
Enzymes belonging to the phospholipase C (PLC) family hydrolyze the phosphodiester bond of phospholipids to give a diacylglycerol and a phosphorylated head group. The bacterial phospholipase C from Bacillus cereus (PLC(Bc)) has been studied extensively, and there is a wealth of information regarding those structural features that are important for substrate activity. In contrast, there is virtually no data available regarding structure-activity relationships for inhibitors of this enzyme. To address this shortcoming, a series of optically pure analogues of 1,2-dihexanoyl-sn-glycero-3-phosphocholine (2) containing different replacements of the phosphate group were first synthesized including the phosphoramidates 4 and 8, the phosphonate 5, the (difluoromethylene)phosphonate 6, the thiophosphate 7, the diastereomeric phosphorothioates 9 and 10, and the phosphorodithioate 11. Each of these phosphatidylcholine derivatives was tested for inhibitor or substrate activity with PLC(Bc) using the water-soluble phosphatidylcholine 2 as the monomeric substrate. The measurements were conducted below the critical micellar concentrations of both 2 and the inhibitor. Of the analogues, only 7 and 9 underwent observable enzymatic hydrolysis under the assay conditions used. The k(cat) of the (Sp)-phosphorothioate 9 was approximately one-fifth that of 2, and when compared to 2, 7 was hydrolyzed only very slowly by the enzyme. Kinetic studies indicated that the phospholipid analogues tested were competitive inhibitors with increasing K-i's follows: 7 approximate to 11 approximate to 10 < 4 approximate to 8 < 5 approximate to 6.