Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Molecular Structures and Catalytic Mechanism of Bacterial Lipases.

세균성 리파제의 분자구조와 작용기작

  • Published : 2003.12.01
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Abstract

Bacteria produce lipases, which can catalyze both the hydrolysis and the synthesis of long chain triglycerides. These reactions usually proceed with high regioselectivity and enantioselectivity, and, therefore, lipases have become very important biocatalysts used in organic chemistry. 3D lipase structures were solved from several bacterial lipases. They have an $\alpha/\beta$ hydrolase fold and a catalytic triad consisting of a nucleophilic serine, and an aspartate or glutamate residue that is hydrogen bonded to a histindine. Active sites are covered with $\alpha$-helical lid structure, of which movement is involved in the enzyme's activation at oil/water interface. Four substrate binding pockets were identified for triglycerides: an oxyanion hole and three pockets accommodating the fatty acids bound at positions sn-1, sn-2, and sn-3. These pockets determine the enantiopreference of a lipase. The understanding of structure-function relationships as well as the development of molecular evolution techniques will enable researchers to tailor new lipases for biotechnological applications.

세균은 지방을 분해할 수 있는 다양한 리파제를 생산한다. 리파제는 반응조건에 따라서 지방의 합성도 수행할 수 있는데 , 이러한 효소반응과정에서 고도의 기질특이성과 위치특이성 및 입체특이성을 보이기 때문에 제약산업과 정밀화학산업에서 효소촉매로서 널리 사용되고 있다. 지금가지 200종류 이상의 리파제효소가 보고되었으며, 이것들은 효소생산기원과 아미노산 상동성을 기준으로 6개의 family로 분류된다. 지난 10년 간 세균 리파제 6종에 대한 3D구조가 밝혀졌다. 이것들은 모두 중심부분에$\alpha/\beta$폴딩구조와 세린, 히스티딘, 아스팔틴산으로 구성된 활성부위를 공통적으로 갖고 있다. 활성부위를 양친성 $\alpha$나선구조가 뚜껑처럼 덮고 있으며, 물과 오일의 경계면을 만나면, 이 뚜껑이 열리고 효소활성이 크게 증가하는 '계면활성화' 현상을 보인다. P. cepacia 리파제 구조에는 기질과 결합하는 4개의 포켓이 있는데 이중 하나는 옥시음이온 구멍이고, 다른 세 개는 기질의 sn-1, sn-2, sn-3 지방산과 결합하는 부위이다. 이 포켓의 크기와 방향 및 소수성정도에 의해서 효소의 기질특이성과 입체특이성이 결정된다. 현재 이러한 구조연구를 기반으로 사용목적에 따른 맞춤 효소를 생산하기 위한 효소 개량연구가 활발히 진행되고 있다.

Keywords

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