Resting cells of a double mutant noted as KSM-MT66, derived from Rhodococcus sp. strain KSM-B-3 by UV irradiation, were found to cis-desaturate isopropyl hexadecanoate, yielding isopropyl cis-6-hexadecenoate. Addition of sodium glutamate (1.0%), MgSO4 (2 mM), and thiamine (2 mM) increased the productivity of the unsaturated product in phosphate buffer. Optimal temperature and pH for the reaction were around 26°C and 7, respectively. Under the optimized conditions, more than 50 g/l of isopropyl cis-6-hexadecenoate was produced after a 3-day incubation by resting cells of the mutant. Thus, cis-6-hexadecenoic acid, the main component of human sebaceous lipids, can be manufactured economically by the rhodococcal bioconversion.
通过紫外线照射从 Rhodococcus sp. 菌株 KSM-B-3 中提取的 KSM-
MT66 双突变体的静止细胞可顺式脱
十六酸异
丙酯,生成顺式-6-
十六碳烯酸异
丙酯。在
磷酸盐缓冲液中加入
谷氨酸钠(1.0%)、
硫酸镁(2 mM)和
硫胺(2 mM)可提高不饱和产物的生产率。反应的最佳温度和 pH 值分别约为 26°C 和 7。在优化条件下,突变体静止细胞经过 3 天培养后,可产生超过 50 克/升的顺式-6-
十六碳烯酸异
丙酯。因此,人类皮脂的主要成分顺式-6-
十六碳烯酸可以通过红球菌
生物转化经济地生产出来。