Abstract
Biosynthesis of glycolipid from glucosamine and $C_{13:0}$ fatty acid was attempted using an enzyme preparation which was extracted from Selenomonas ruminantium grown in lactic acid medium by means of ultrasonication, and with cofactors of ATP, Co A, $Mg^{++}$, and UTP. The results are summarized as follows: 1. The rate of synthesis of glycolipid from $^{14}C-glucosamine$ and tridecyl CoA by an enzyme from Selenomonas ruminantium was promoted by the presence of co-factors, ATP, Mg, and UTP. 2. The rate of incorporation of $^{14}C-glucosamine$ into glycolipid by the centrifugal fraction of bacterial preparation was the highest in the 105,000 g supernatant fraction, indicating about twice the enzyme activity as the 6,000 rpm supernatant fraction. 3. The biosynthesis of glycolipid from $^{14}C-glucosamine$ and tridecyl-CoA by the crude enzyme of the 105,000 g supernatant fraction of Selenomonas ruminantium cell preparation proceeded the most part of it in 30 minutes and completed in an hour.
유산염배지(乳酸鹽培地)에서 배양(培養)한 Selenomonas ruminantium 균체(菌體)를 초음파처리후(超音波處理後) 추출(抽出)한 효소(酵素)와 cofactor로서 ATP, CoA, $Mg^{++}$, UTP를 사용(使用)하여 in vitro에서 당지질(糖脂質)을 생합성(生合成)하여 본 결과(結果)는 다음과 같다. 1. Selenomonas ruminantium의 효소(酵素)에 의(依)한 $^{14}C-glucosamine$과 tridecyl-Co A로 부터의 당지질(糖脂質)의 in vitro 생합성(生合成)은 ATP, $Mg^{++}$, UTP,에 의(依)하여 촉진(促進)되었다. 2. 효소추출액(酵素抽出液)을 원심분리(遠心分離)로 분획(分劃)하고 각분획(各分劃)의 glycolipid 합성능(合成能)을 본 결과(結果) 105,000의 supernatant에 6,000rpm supernatant의 약(約) 2배(倍)의 효소활성(酵素活性)을 나타내는 조효소(粗酵素)가 존재(存在)함을 알았다. 3. 효소반응(酵素反應)은 30분(分)일 때 대부분(大部分)이 진행(進行)되며 1시간(時間)에서 거의 완결(完結)됨을 알았다.