- Pseudomonas rhodesiae H5가 생산하는 Parathion Hydrolase의 특성
- ㆍ 저자명
- 윤남경,박경량,Yun. Nam Kyung,Park. Kyeong Ryang
- ㆍ 간행물명
- 미생물학회지
- ㆍ 권/호정보
- 2004년|40권 3호|pp.199-204 (6 pages)
- ㆍ 발행정보
- 한국미생물학회
- ㆍ 파일정보
- 정기간행물| PDF텍스트
- ㆍ 주제분야
- 기타
Pseudomonas rhodesiae H5가 생성하는 parathion hydrolase를 $(NH_{4})_{2}SO_{4}$침전, DEAE-Toyopearl 650M ion exchange chromatography, Sephadex gel filtration의 단계로 정제한 결과, 이 균주가 생성하는 parathion hydrolase는 두 종류의 효소였으며, 이를 각각 OPH $I_1$과 OPH $I_2$라 명명하였다. OPH $I_1$과 OPH $I_2$의 최적 pH와 온도는 각각 pH7.2, $30^{circ}C$와 PH7.6, $37^{circ}C$이었다. OPH $I_1$의 Parathion을 가수분해하는 활성화 에너지는 $4^{circ}C$-$30^{circ}C$에서 3.01㎉/㏖ 이었으며 Km값은 69.2${mu}M$이었다. 반면, OPH $I_2$의 활성화에너지는 $4^{circ}C$-$37^{circ}C$에서 4.07kcal/㏖이었으며 Km값은 150.9${mu}M$이었다. OPH $I_1$은 1 mM의 $Mg^2+$, $Cu^2+$, $Ca^2+$, $Ni^2+$에 의해서 효소활성이 완전 저해되었으나 OPH $I_2$는 저해를 덜 받는 것으로 확인되었다.
The parathion hydrolase (OPH) produced by Pseudomonas rhodesiae H5 was purified by ammonium sulfate precipitation, DEAE-Toyopearl 650M ion exchange chromatography and Sephadex gel filtration chromatography. Parathion hydrolase from crude extracts of P. rhodesiae H5 has two components designated as OPH $I_1$ and OPH $I_2$, Optimum pH and temperature of OPH $I_1$and OPH $I_2$ were pH 7.2 and $30^{circ}C$, and pH 7.6 and $37^{circ}C$, respectively. The activation energy of OPH $I_1$ for the hydrolysis of parathion was 3.01 ㎉/I, II, III in the temperature range of $4^{circ}C$ to $30^{circ}C$, and Michaelis constant ($K_m$) for parathion was 69.2 ${mu}M$. The activation energy of OPH $I_2$ for the hydrolysis of parathion was 4.07㎉/㏖ in the temperature range of $4^{circ}C$ to $37^{circ}C$, and Michaelis constant for parathion was 150.9${mu}M$. Furthermore OPH $I_1$ was completely inhibited by 1 mM $Ca^2+$, $Cu^2+$, $Mg^2+$, $Ni^2+$, but OPH $I_2$ was less inhibited than OPH $I_1$ by the metals used in this study.