STEREOCHEMISTRY OF ENZYME REACTIONS

在我们对酶的立体化学的继续研究中 反应，主要重点将继续放在立体过程上 一碳代谢的反应。立体化学问题有待解决 关于苄基异喹啉中亚甲二氧基桥的形成 生物碱，吲哚C-2位色氨酸甲基化， 亚甲基四氢叶酸还原酶反应，含B12的酶 参与甲基转移，产甲烷细菌中甲烷的形成 和甲烷加氧酶对甲烷的氧化，以及C-P键在 乙基膦酸根的降解。此外，在以下项目下启动了两个项目 其他赠款将被纳入这一计划。其中一笔交易 手性聚酮形成的立体化学分析 使用纯化酶的丙二酸和/或手性醋酸酯(查尔酮形成) 或整个细胞(一些真菌代谢物)。另一种是立体化学 5-磷酸核酮糖独特重排反应的分析 转化为新型糖1-脱氧四氟糖-4-磷酸，a 核黄素的前体。

In the continuation of our studies on the stereochemistry of enzyme reactions, the main emphasis will continue to be on the steric course of reactions of one-carbon metabolism. Stereochemical questions to be addressed relate to methylenedioxy bridge formation in benzylisoquinoline alkaloids, tryptophan methylation at C-2 of indole, the methylenetetrahydrofolate reductase reaction, B12-containing enzymes involved in methyl transfers, methane formation in methanogenic bacteria and methane oxidation by methane oxygenase, and C-P bond cleavage in the degradation of ethylphosphonate. In addition, two projects initiated under other grants will be incorporated into this program. One of these deals with the stereochemical analysis of polyketide formation from chiral malonate and/or chiral acetate using purified enzymes (chalcone formation) or whole cells (some fungal metabolites). The other is the stereochemical analysis of the unique rearrangement reaction by which ribulose 5-phosphate is converted into the novel sugar, 1-deoxytetrulose 4-phosphate, a precursor of riboflavin.