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NTIS 바로가기Korean journal of microbiology = 미생물학회지, v.52 no.4, 2016년, pp.455 - 462
우상희 (충남대학교 미생물.분자생명과학과) , 이선희 (충남대학교 미생물.분자생명과학과) , 이영하 (충남대학교 미생물.분자생명과학과)
Pseudomonas aeruginosa P-5 is an unusual organism capable of synthesizing polyhydroxyalkanoates (PHAs) consisting of 3-hydroxyvalerate (3HV) and medium-chain-length (MCL) 3-hydroxyalkanoate (3HA) monomer units when C-odd alkanoic acids are fed as the sole carbon source. Evaluation of the substrate c...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
Pseudomonas aeruginosa P-5 균주란 어떤 균주인가? | 최근 본 저자들의 연구실에서는 nonanoic acid, heptanoic acid와 같이 홀수개의 탄소수를 갖는 alkanoic acids를 탄소원 으로 공급하였을 때, MCL 3HAs 이외에 3-hydroxyvalerate (3HV)를 단위체로 하는 공중합체를 생합성하는 Pseudomonas aeruginosa P-5 균주를 보고한 바 있다(Woo et al., 2012). | |
PHA 생합성 균주들이 서로 다른 탄소사슬길이를 갖는 PHA synthase 의 기질특이성을 가지는데, 그 예시로는 어떤 것이 있는가? | 지금까지 발견된 대부분의 PHA 생합성 균주들의 경우 SCL-PHAs와 MCL-PHAs 중 한 가지만을 생합성할 수 있는데, 이러한 특징은 서로 다른 탄소사슬 길이 를 가지는 (R)-hydroxyalkanoyl-CoAs에 대한 PHA synthases 의 기질특이성(substrate specificity)에 기인한다. 즉, SCL-PHAs 생합성 미생물은 탄소수가 5 이하인 (R)-hydroxyalkanoyl-CoAs 에만 선택적 특이성을 보이는 SCL-PHA synthase를 보유하는 데 반하여, MCL-PHAs 생합성 미생물은 탄소수가 6 이상인 (R)-hydroxyalkanoyl-CoAs에 기질특이성을 나타내는 MCL-PHA synthase를 갖고 있다(Kim et al., 2007). | |
PHAs는 어떤 고분자인가? | Poly (3-hydroxyalkanoates) (PHAs)는 과량의 탄소원이 존 재하지만 질소, 인, 황과 같은 영양분이결핍되거나 용존산소의 농도가 낮은 불균형 영양조건하에서, 탄소 및 에너지원으로 사용하기 위하여 세균 세포 내에 축적되는 저장성 폴리에스터 고분자이다(Steinbüchel and Lütke-Eversloh, 2003). PHAs 는 합성플라스틱과는 달리 재생자원을 발효기질로 사용하여 생산될 수 있고 생분해성 및 생체친화성이 우수하기 때문에 식품, 정밀화학, 의료용 소재 등의 다양한 분야에서 합성고분자를 대체하여 사용될 수 있는 미생물고분자로 큰 관심을 모으고 있다(Akaraonye et al. |
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