Recherches dans la série des cyclitols XXVI. Obtention d'inositol-phosphodiesters cycliques et transposition d'esters inositol-monophosphoriques
作者:Th. Posternak
DOI:10.1002/hlca.19580410644
日期:——
La formation de phosphodiesters-1,2 cycliques a été observée à partir de l'acide scyllitol-phosphorique etde l'acide ms-inositol-2-phosphorique; la substance formée à partir de ce dernier a été préparée comme sel de baryum analytiquement pur. Par traitement acide ou alcalin ménagé, elle fournit deux produits, vraisemblablement les acides ms-inositol-2- et -1(3)-phosphoriques, le dernier étant en quantité
形成磷酸二酯-1,2,2,3,5-环己基鞘氨醇-磷酸酯的观察和发现-甲基肌醇-2-磷酸酯。在巴雷姆分析中使用的基本物质和安全证书。酸度或碱性磷酸酶的特征,酸性产物ms-inositol-2- et -1(3)-磷光体的可重组性,定量的抗微生物剂。混合糖类的合成品和类似品的混合物大豆和肌醇磷酸酯类产品的代用组合物酸性和磷酸二乙酯-磷酸肌醇类的特征-O-乙酰基-1,3,4,5,6-O-二苯基磷酰基-2-ms-肌醇 水解碱性蛋白酶物质导管 按比例倒置作曲。肌醇中的磷酸酯类和肌醇的磷酸酯类,以及可能的磷酸化肌醇水解的可能的替代品。
Synthesis and Kinetic Evaluation of Inhibitors of the Phosphatidylinositol-Specific Phospholipase C from <i>Bacillus cereus</i>
作者:Stephen F. Martin、Allan S. Wagman
DOI:10.1021/jo960850q
日期:1996.11.15
Substrate analogues of phosphatidylinositol (1) were synthesized and evaluated as potential inhibitors of the bacterial phosphatidylinositol-specific phospholipaseC (PI-PLC) from Bacillus cereus. The chiral analogues of the water-soluble phospholipid substrate 5 were designed to probe the effects of varying the inositol C-2 hydroxyl group, which is generally believed to serve as the nucleophile in
Synthesis of a new fluorogenic substrate for the assay of phosphoinositide-specific phospholipase C
作者:Aleksey V. rukavishnikov、Miles P. Smith、G. Bruce Birrell、John F.W. Keana、O. Hayes Griffith
DOI:10.1016/s0040-4039(98)01429-4
日期:1998.9
The synthesis of a fluorescein-derived fluorogenic substrate, D,L-myo-inositol l-([6′-hexyloxy-3-oxo]spiro[isobenzofuran-1(3H),9′-[9H]xanthen]-3′-yl hydrogen phosphate) sodium salt 9, for assay of activity of phosphatidylinositide-specific phospholipase C (PI-PLC), is described. This substrate is shown to be a sensitive substrate for bacterial PI-PLC in a continuous, non-radioactive assay.
Synthesis of Inositol Phosphodiesters by Phospholipase C-Catalyzed Transesterification
作者:Karol S. Bruzik、Zhiwen Guan、Suzette Riddle、Ming-Daw Tsai
DOI:10.1021/ja9616084
日期:1996.1.1
Transesterification of primary alcohols with inositol 1,2-cyclic phosphate (IcP) in the presence of phosphatidylinositol-specific phospholipase C (PI-PLC) resulted in the formation of O-alkyl inositol 1-phosphates. The starting IcP was obtained in a single step by PI-PLC catalyzed cleavage of phosphatidylinositol from the soybean phospholipid. The transesterification reaction was performed with a series of 20 structurally diverse hydroxyl compounds, ranging in the structural complexity from methanol to the serine-containing Ser-Tyr-Ser-Met tetrapeptide, to give the corresponding phosphodiesters with 20-80% yields, depending mainly on the solubility of alcohols in water. The rates of transesterifications, and of the competing hydrolysis of IcP to inositol 1-phosphate (IP), were relatively insensitive to the alcohol structure. With polyhydroxyl compounds such as glycerol and hexitols, the enzyme displayed complete preference toward formation of the inositol phosphate derivatives of the primary hydroxyl groups. On the other hand, PI-PLC did not discriminate between primary hydroxyl groups in different environments and showed low stereoselectivity with racemic alcohols featuring a chiral center at the beta-position, The O-alkyl inositol phosphates formed were readily separable from the hydrolytic product, IP, by the anion-exchange chromatography, and were fully characterized by means of H-1 and P-31 NMR and electrospray MS. Our results provide a new, simple, and efficient two-step synthetic route to substituted O-alkyl inositol phosphates from inexpensive starting materials. The reported reaction was successfully applied to synthesis of complex inositol phosphate derivatives, as illustrated by inositol phosphoesters of mono- and oligosaccharides, nucleosides and peptides. The synthetic usefulness of this reaction, however, is not limited to the examples shown. Because transesterification activity of phospholipase C has not been reported before, its mechanism is discussed in a broad context of mechanisms of phosphoesterases.
Studies on myo-Inositol Phosphates of Natural Origin