Biosynthesis of Vitamin B<sub>1</sub> in Yeast. Derivation of the Pyrimidine Unit from Pyridoxine and Histidine. Intermediacy of Urocanic Acid
作者:Johannes Zeidler、Brian G. Sayer、Ian D. Spenser
DOI:10.1021/ja030261j
日期:2003.10.1
Incorporation studies with 13C-, 15N-, and 2H-labeled substrates, followed by NMR analysis, show that the pyrimidine unit of thiamin (Vitamin B1) originates from a C5N fragment, derived from C-2',2,N,C-6,5,5' of pyridoxol (Vitamin B6) and an N-C-N fragment derived from L-histidine. Urocanic acid serves as an intermediate on the route of the N-C-N fragment of histidine into the thiamin pyrimidine.
使用 13C-、15N- 和 2H-标记的底物进行掺入研究,然后进行 NMR 分析,结果表明硫胺素(维生素 B1)的嘧啶单元源自 C-2',2,N,C- 的 C5N 片段吡哆醇(维生素 B6)的 6,5,5' 和 L-组氨酸衍生的 NCN 片段。尿烷酸在组氨酸的 NCN 片段进入硫胺嘧啶的途径中充当中间体。