Progesterone Hydroxylation by Rhizopus nigricans(I): The effects of reaction conditions

Rhizopus nigricans 에 의한 Progesterone 의 Hydroxylation(I): 반응 조건의 영향

  • Kim, Myung-Hee (Department of Biology, Sang Myung Women's University) ;
  • Kim, Mal-Nam (Department of Biology, Sang Myung Women's University)
  • 김명희 (상명여자대학교 생물학과) ;
  • 김말남 (상명여자대학교 생물학과)
  • Published : 1987.03.30

Abstract

Physicochemical factors influencing the $11{\alpha}$, hydroxylation of progesterone by Rhizopus nigricans Ehrenberg were studied. The higher is the concentration of progesterone. the shorter time is need to attain maximum yield in the $11{\alpha}-hydroxyprogesterone$. High concentration in progesterone was supposed to inhibit the hydroxylation reaction of the $11{\alpha}-hydroxyprogesterone$. The range of optimum pH and temperature appeared to be rather broad and these conditions were similar to those of optimum growth of the mycelia. Agitation at a higher speed than a certain limit, and the presence of sugars accelerated the $11{\alpha}-hydroxyprogesterone$ reaction. Glucose was found to be more effective for the reaction using spores rather than mycelia as enzyme sources. Organic solvents were proved to supress the enzyme activity, which decreased with increase in the concentration of the organic solvents and in the time for pretreatment with the solvents.

R. nigricans Ehrenberg 에 의한 progesterone 의 $11{\alpha}-hydroxyprogesterone$에 영향을 미치는 여러 물러 화학적 요인에 대하여 조사하였다. Progesterone의 농도가 낮을수록 $11{\alpha}-hydroxyprogesterone$이 최고의 수득율에 도달하는데 소요되는 시간이 짧았으며, 높은 기질 농도에서의 Progesterone은 $11{\alpha}-hydroxyprogesterone$의 hydroxylation을 저해하였다. 이 반응에 대한 최적 pH와 온도 범위는 비교적 넓은 범위로 나타났으며, 균사제의 성장 죄적 조건과 유사하였다. 일정 속도 이상의 진탕 속도와 당류들은 $11{\alpha}-hydroxyprogesterone$ 반응을 촉진시키는 효과를 보였으매, 균사체에서 보다 포자를 효소원으로 사용하였을 때 glucose의 효과는 더 크게 나타났다. 유기 용매는 효소 활성 저해제로 작용하었으며, 저해 정도는 유기 통매 농도가 높을수록, 용매에 처리한 시간이 길어질수록 높게 나타났다.

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