논문 상세보기
pp.404-408
콩단백질은 글리시닌과 β-콘글리시닌을 주요 성분으로 한다. 영양성 및 가공 특성을 개선하기 위하여 유전자공학적인 방법을 시도하였다. 즉 β-콘글리시닌의 β-서브유니트롤 유전자 클로닝하고 대장균에서 발현시켰다. 발현벡타는 pET 21d이며 플라스미드를 구축하여 E.coli BL21(DE3)에 형질전화시켰다. 발현된 단백질은 균체 전체 단백질의 20%이며 가용화 상태로 축적되었다. 축적 발현단백질은 천연의 β-콘글리시닌과 동일항 트러머로 확인되었다. 정제는 호아산암모늄 20∼40%분별침전, Q-Sepharose 이온교환크로마토그라피, Butyltoyoperal 소수성 컬럼크로마토그라피로 하였다. 이것은 콩단백질의 특성을 규명하는데 필요한 대장균 대량 발현계를 확입하고 발현단백질의 정제방법을 확립한 결과이다.
One of the major objectives of the food industry is the enrichment of the functional properties and nutritional value of soybean protein. To attain this goal, an expression system of cDNA encoding native and protein-engineered soybean proteins in a microorganism must be developed and the function then ability of self-assembly and the functionalities of the expressed proteins should be evaluated before the modified genes are transfered to soybean plants. The pro-β-conglycinin synthesized in E. coli BL21(DE3)comprised approximately 20% of the total bacterial proteins and the expressed protein are formed soluble and trimer such as native protein in E. coli cells. The highly expressed protein was purified to homogeneity by salt precipitation with 20∼40% Ammonium sulfate ion-exchange chromatography with Q-Sepharose and hydrophobic column chramatography with Butyltoyoperal. Therefore, we concluded that the high-level expression system of β-conglucinin cDNA was established and a relatively simple and rapid method for purifying pro-β-conglicinin was also developed.
