Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
권호 표지

Rearrangement of $Km^{r}$ Gene and Plasmid by Conjugal Transfer in aquatic Environments

수계에서 접합에 의하여 전이된 $Km^{r}$ 유전자 및 Plasmid 의 재배열

  • 이성기 (충북대학교 자연대 미생물학과) ;
  • 김치경 (서울대학교 분자미생물학 연구센터)
  • Published : 1993.08.01
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Abstract

The $Km^{r}$ gene and plasmid of natural isolate and genetically modified microorganisms (GMM) rearranged by conjugation in water environments were comparatively analyzed by agarose gel electrophoresis and Southern analysis. The transfer rates of the $Km^{r}$ gene from GMM strains were generally 100 times higher than thosc of natural iso]ate(DKI) under laboratory cnvironments, but their transfer rate was not much different in Moosimcheon River water. The conjugants obtained in LB(Luria-Bertani broth) and FW(filtered river water) water under laboratory conditions showed same number of the plasmids. but the sizes of the plasmids were changed. The $Km^{r}$ gene in the conjugants was found in the same position as the pDKJO] $Km^{r}$ plasmid. In case of the GMM strains as donor. the large plasmids of 180 kb appeared in conjugants obtained in LB and FW water. Especially, the $Km^{r}$ gene in the donor of DKC600 was found to be inserted into chromosome of the conjugant obtained in FW water. However. in the conjugants obtained from DKl and DKB 701 in Moosimcheon River water, the plasmids were rearranged by 4 and 8. respectively, and all of them showed hybridization by the $Km^{r}$ probe. But the small plasmids of the recipient disappeared in the conjugant from DKC600 as donor, and the rearranged plasm ids and chromosome in the conjugants were observed to be hybridized with the $Km^{r}$ probe. Therefore, rearrangement of $Km^{r}$ gene and plasmids by conjugation was found to be afTected diversely by cellular characteristics as well as by environmental factors.

수계환경에서 세균의 접합에 의해 나타난 conjugant 에서 plasmid 의 재배열과 $Km^{r}$ 유전자의 행방을 조사하기 위하여 자연계 분리균주와 유전공학적 변형균주(GMM)의 $Km^{r}$ 유전자의 전이빈도를 조사하는 동시에 3.9 kb 의 $Km^{r}$ 유전자를 DNA probe 로 사용하여 Southern analysis 를 실시하였다. $Km^{r}$ 유전자의 전이빈도는 실험실 환경에서 GMM 균주가 자연계균주(DK1) 보다 100배 더 높게 나타났으나, 무심천에서는 균주에 따라 차이가 없었다. 실험실환경에서 DK1 균주를 donor 로 하여 LB 나 FW 에서 얻은 conjugant 들은 모두 같은 수의 plasmid 를 가지고 있었으나 크기는 다르게 재배열하였다으며, $Km^{r}$ 유전자는 donor 의 R plasmid 인 pDK101 과 비슷한 위치에서 발견되었다. GMM 균주가 donor 일 때에는 180 kb 의 plasmid 가 새로 나타났으며, 특히 FW 수질에서 donor 가 DKC600 일 때는 $Km^{r}$ 유전자가 염색체에 삽입되어 있었다. 무심천의 자연계 수질환경에서는 DK1 이나 DKB701 이 donor 일 때 4개 및 8개의 plasmid 가 새로 나타났으며, $Km^{r}$ 유전자는 재배열된 4개의 plasmid 와 염색체에서 발견되었다. DKC600 이 donor 일 때는 recipient 의 작은 plasmid 가 모두 소실되었으나, $Km^{r}$ 유전자는 새로 나타난 plasmid 와 염색체에서 발견되었다. 그러므로 자연환경에서의 수질에서는 plasmid 의 재배열이 더 다양했으며, $Km^{r}$ 유전자도 다양한 크기로 재배열된 plasmid 에서 발견되었다.

Keywords

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