作者:M. S. Kuo、V. H. WILEY、J. I. CIALDELLA、D. A. YUREK、H. A. WHALEY、V. P. MARSHALL
DOI:10.7164/antibiotics.49.1006
日期:——
This report describes the results of a biosynthesisstudy of marcfortine A (MA). We report here that MA is derivedfrom methionine, tryptophan, lysine and two isoprene units, the latter two being derivedfromaceticacid. From the 13C enrichment pattern of the pipecolic acid moeity we further conclude that this unit is derivedfrom lysine via alpha-ketoglutarate. Therefore, we have accounted for the
Synthesis of three isotopomers of L-tryptophan via a combination of organic synthesis and biotechnology
作者:E. M. M. van den Berg、A. U. Baldew、A. T. J. W. de Goede、J. Raap、J. Lugtenburg
DOI:10.1002/recl.19881070206
日期:——
99% 15N (position 1) and 99% 13C (position 2) in the indole ring; for position 3, the incorporation was 90% 13C. The isotopically enriched indoles were synthesized from H15NO3, K13CN and 13CH3CN and then converted, with L-serine, into the correspondingly labelled L-tryptophans using genetic manipulated E. coli bacteria, which contain high amounts of the enzyme tryptophan synthetase. The 13C-13C, 13C-1H
在本文中,我们以克为单位报告了L-色氨酸的三种同分异构体的制备,在吲哚环中分别标记了99%15 N(位置1)和99%13 C(位置2)。对于位置3,掺入90%13 ℃。同位素富集的吲哚被选自H合成15 NO 3,K 13 CN和13 CH 3 CN,然后转化,具有L-丝氨酸,到使用基因的相应标记的L-色氨酸操纵大肠杆菌细菌,其含有高含量的酶色氨酸合成酶。所述13 C- 13 C,13 C-从1 H NMR和13 C NMR光谱确定吲哚和色氨酸的1 H,13 C- 15 N和15 N- 1 H耦合常数。