The identification of (3R,4S)-5-fluoro-5-deoxy-d-ribulose-1-phosphate as an intermediate in fluorometabolite biosynthesis in Streptomyces cattleya
作者:Mayca Onega、Ryan P. McGlinchey、Hai Deng、John T.G. Hamilton、David O’Hagan
DOI:10.1016/j.bioorg.2007.04.001
日期:2007.10
(3R,4S)-5-Fluoro-5-deoxy-D-ribulose-1-phosphate (5-FDRulP) has been identified as the third fluorinated intermediate on the biosynthetic pathway to fluoroacetate and 4-fluorothreonine in Streptomyces cattleya. 5-FDRulP is generated after formation of 5 '-fluoro-5 '-deoxyadenosine (5 '-FDA) and then phosphorolysis of 5 '-FDA to 5-fluoro-5-deoxy-D-ribose-1-phosphate (5-FDRP) by the action of a purine nucleoside phosphorylase. An isomerase mediates the conversion of 5-FDRP to 5-FDRulP. The identity of the (3R,4S) diastereoisomer of 5-FDRulP was established by comparative F-19H-1} NMR studies whereby 5-FDRulP that accumulated in a cell free extract of S. cattleya, was treated with a phytase to generate the non-phosphorylated sugar, 5-fluoro-5-deoxy-D-ribulose (5-FDRul). This S. cattleya product was compared to the product of an in-vitro biotransformation where separately 5-fluoro5-deoxy-D-ribose and 5-fluoro-5-deoxy-D-xylose were converted to 5-fluoro-5-deoxy-D-ribulose and 5-fluoro-5-deoxy-D-xylulose respectively by the action of glucose isomerase. It was demonstrated that 5-fluoro-5-deoxy-D-ribose gave the identical diastereoisomer to that observed from 5-FDRulP. (c) 2007 Elsevier Inc. All rights reserved.
(3R,4S)-5-氟-5-脱氧-D-核糖醇-1-磷酸酯(5-FDRulP)在链霉菌cattleya的氟乙酸和4-氟苏氨酸生物合成途径中被鉴定为第三个含氟的中间体。5-FDRulP是在5'-氟-5'-脱氧腺苷(5'-FDA)形成之后,由嘌呤核苷磷酸化酶作用使5'-FDA发生磷酸水解生成5-氟-5-脱氧-D-核糖-1-磷酸(5-FDRP),随后通过异构酶的作用将5-FDRP转化为5-FDRulP。5-FDRulP的(3R,4S)异构体身份通过比较F-19H-1} NMR研究得以确定。具体来说,链霉菌cattleya细胞提取物中积累的5-FDRulP经磷酸酶处理生成非磷酸化糖5-氟-5-脱氧-D-核糖醇(5-FDRul)。该链霉菌cattleya产物与体外生物转化产物进行比较,其中5-氟-5-脱氧-D-核糖和5-氟-5-脱氧-D-木糖分别在葡萄糖异构酶作用下转化为5-氟-5-脱氧-D-核糖醇和5-氟-5-脱氧-D-木糖醇。结果表明,5-氟-5-脱氧-D-核糖生成了与5-FDRulP中相同的异构体。 © 2007 Elsevier Inc. 保留所有权利。