한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)

  • 제30권2호
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  • Pages.111-115
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  • 2002
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  • 1598-642X(pISSN)
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  • 2234-7305(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지

Monascus anka로부터 황색소 생성 변이주의 분리 및 특성

Isolation and characteristics of yellow-pigment producing mutants of Monascus anka.

  • 이호재 (동의공업대학 식품생명과학과) ;
  • 이형주 (서울대학교 식품공학과)
  • 발행 : 2002.06.01
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초록

천연 황색소 생산을 위하여 Monascus anka Nakazawa et Sato IFO 4478(KCCM l1832 strain) 균주를 모균주로 하여 UV 조사 및 NTG(N-methyl-N'-nitro-N-nitrosoguanidine)처리 및 이들 방법을 병용하는 방법을 사용하여 모균주와는 색소생성 특성이 다르게 황색소를 단일성분으로 생성하는 변이주를 분리하고 그 특성을 조사하였다. leucine, cystein, aspartic acid, glutamic acid 와 asparagine 등 5종의 아미노산에 대한 영양요구주를 분리하였고 이중 asparagine 영양요구주 Y7은 colony 형태와 균사의 직경에서 약간의 차이를 나타내지만 전형적인 Monascus 균주의 특성을 지니고 있었으며 특히 유성생식에 의한 번식 특성이 강하여 색소 생성에 유리한 조건을 지니고 있었다. 그리고 Y7은 밝은 색조의 황색소를 단일 성분으로 생성하며 10대 이상의 계대배양에서도 색소 생성 특성이 안정하였고 색소 생성량이 모균주보다 약 2.2배 높은 값을 나타내고 있었다. 이때 생성된 황색소는 373 nm에서 단일 흡수 peak를 나타내고 물, 에탄올 등 극성용매에 대한 용해성이 높은 특성을 나타내며 생성된 색소의 대부분이 균체 밖으로 배출되는 특성을 지니고 있었다.

To produce yellow pigment selectively, mutants were induced from Monascus anka Nakazawa et Sato IFO 4478 (KCCM 11832 strain), and their characteristics were evaluated. Five kinds of auxotrophic mutants which required amino acids for growth and pigmentation, were isolated through a series of mutagenic treatments. Especially, asparagine auxotroph Y7 produced high ratio of yellow pigment. This mutant showed all the morphological characteristics of Monascuceae but the shape of colony and the diameter of conidia. Mutant Y7 was propagated by sexual reproduction more often than asexual reproduction, which could be effective in production of pigments. Yellow pigment produced extracellularly by the mutant Y7 was more soluble in polar solvents such as ethanol and water than in nonpolar solvents. Its productivity of yellow pigment was 2.2 times higher in the mutant Y7 than in parents. In addition, its yellow pigment showed characteristics of maximum absorption at 373 nm. Moreover, the hue of pigment produced by the mutant Y7 was bright yellow, and it was stable through the subculture over 10 generations.

키워드

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