Biotransformation of Sisomicin and Verdamicin by<i>Micromonospora sagamiensis</i>
作者:Hiroshi Kase、Gen Shimura、Takao Iida、Kiyoshi Nakayama
DOI:10.1080/00021369.1982.10865090
日期:1982.2
The resting cells of a 2-deoxystreptamine idiotrophic mutant of Micromonospora sagamiensis were found to transform sisomicin into gentamicin C1a and sagamicin. The biotransformation products were isolated by a combination of ion exchange and carbon column chromatographic procedures, and properly identified. Antibiotic G-52 (6′-N-methylsisomicin) was not detected in the transformation products. Gentamicin C1a was formed at an early stage of the biotransformation, followed by sagamicin formation. The (4′,5′)-reduction of sisomicin may occur first, followed by 6′-N-methylation. By use of a similar procedure, it was demonstrated that verdamicin was transformed into gentamicin C2a (the 6′-C epimer of gentamicin C2), C2, and then C1. Carbon TLC clearly separated gentamicin C2a, C2, and verdamicin. In this biotransformation, the (4′,5′)-reduction of verdamicin occurred first, followed by 6′-C-epimerization, and then 6′-N-methylation.In contrast with M. sagamiensis, M. zionensis NRRL5466 and M. inyoensis NRRL3292 did not possess any detectable activity of the (4′,5′)-reduction of sisomicin or verdamicin. Alternatively, NRRL5466 transformed sisomicin into antibiotic G-52, and verdamicin into a new antibiotic, VF3-1. The antibiotic VF3-1 was suggested as 6′-N-methylverdamicin by chromatographic and mass spectrum data. The implications of these findings were discussed in relation to sagamicin biosynthesis in M. sagamiensis.
研究发现,一种 2-脱氧链霉胺白痴化突变体(Micromonospora sagamiensis)的静止细胞能将西索米星转化为庆大霉素 C1a 和沙加米星。通过离子交换和碳柱色谱相结合的方法分离了生物转化产物,并进行了适当的鉴定。在转化产物中没有检测到抗生素 G-52(6′-N-甲基西索米星)。庆大霉素 C1a 在生物转化的早期形成,随后形成了沙加米星。西索米星可能首先发生(4′,5′)还原,然后是 6′-N-甲基化。通过使用类似的程序,证明了维达米星转化为庆大霉素 C2a(庆大霉素 C2 的 6′-C外嵌体)、C2,然后是 C1。碳液相色谱法清楚地分离了庆大霉素 C2a、C2 和维达米星。在这一生物转化过程中,首先发生的是维达米星的(4′,5′)还原反应,然后是 6′-C-表聚反应,最后是 6′-N-甲基化反应。与萨加米菌相反,锡安菌 NRRL5466 和伊代菌 NRRL3292 不具有任何可检测到的西索米星或维达米星(4′,5′)还原活性。另外,NRRL5466 将西索米星转化为抗生素 G-52,将维达米星转化为一种新的抗生素 VF3-1。根据色谱和质谱数据,抗生素 VF3-1 被认为是 6′-N-甲基氟达米星。讨论了这些发现对相思豆菌中沙加米星生物合成的影响。