testosteroni . The 7α- and 7β-hydroxylated derivatives of [ 4- 14 C ]-EPIA produced were prepared after incubation with mycelium of Rhizopus nigricans . Each labeled steroid was purified by chromatography and identified by crystallization to constant specific activity after isotopic dilution with each authentic steroid carrier. Production yields and radio-purity measurements allowed the use of such procedures
摘要 利用酵母表达的人细胞色素P4507B1制备了[ 4- 14 C]-脱氢
表雄酮的7α-和7β-羟基化衍
生物。
表雄酮 (E
PIA)、5α-
雄甾烷-3β,17β
-二醇和 5α-
雄甾烷-3,17-二酮是在 [4- 14 C ]-5α-二氢
睾酮与表达的大肠杆菌 (3β,17β) 孵育后获得的-来自睾丸假单胞菌的羟基类
固醇脱氢酶。产生的[ 4- 14 C]-E
PIA的7α-和7β-羟基化衍
生物是在与黑根霉菌丝体孵育后制备的。每种标记的类
固醇通过色谱法纯化,并在用每种真正的类
固醇载体进行同位素稀释后通过结晶鉴定到恒定的比活性。