Abstract:
본 발명은 어위니아 허비콜라(Erwinia herbicola) 균주로부터 분리한 세포막결합 2-케토-디-글루코네이트 탈수소효소(2-keto-D-gluconate dehydrogenase) 유전자 염기서열 및 이 유전자를 세포내 대사과정이 없는 다른 균주에 도입하여 배양하므로써 재조합 2-케토-디-글루코네이트 탈수소효소에 의해 2-케토-디-글루코네이트(2-keto-D-gluconate)를 2,5-다이케토-디-글루코네이트(2,5-diketo-D-gluconate)로 전환하는 방법에 관한 것으로 상기 어위니아 허비콜라 ATCC 08111 균주로부터 세포막결합 2-케토-디-글루코네이트 탈수소효소 유전자를 클로닝 및 서브클로닝하여 세포막결합 2-케토-디-글루코네이트 탈수소효소 유전자 염기서열을 결정한 후 이 유전자가 삽입된 재조합 플라스미드 pKI111를 대장균에 도입하므로써 대장균을 형질전환시킨 후 배양하여 형질전환된 대장균내에서 세� �막결합 2-케토-디-글루코네이트 탈수소효소 유전자를 발현시키므로써 재조합 세포막결합 2-케토-디-글루코네이트 탈수소효소 활성에 의해 2-케토-디-글루코네이트를 2,5-다이케토-디-글루코네이트로 세포내 대사분해 없이 신속하게 전환할 수 있는 뛰어난 효과가 있다.
Abstract:
An extraction method of edible red pigment from cockscomb (Celosia cristata) is presented. Thus, cockscomb is dried at cold and dark place, crushed by mortar, and preserved at -70oC in a sealed bottle. The material (20g) is treated with 500-1000 ml of a solvent containing water, ethanol, methanol, and 0.1-5% of HCl to extract the pigment of cockscomb. The pigment is loaded on a preparative agarose gel electrophoresis (0.1M Na-citrate buffer, ph 4.5; 5mA/cm; 5 hrs). After the electrophoresis, the red pigment portion is cut, eluted with distilled water, and centrifuged at 10,000rpm for 30 min to give a pure red pigment.
Abstract:
PURPOSE: Nucleotide sequence of membrane bound 2-keto-D-gluconate dehydrogenase gene from Erwinia herbicola is determined and used for bio transformation of 2-keto-D-gluconate into 2,5-diketo-D-gluconate. 2,5-diketo-D-gluconate is an intermediate to produce vitamin C and pharmaceutics CONSTITUTION: Nucleotide sequence of membrane bound 2-keto-D-glaciate dehydrogenate is determined and bio transformation of 2-keto-D-gluconate into 2,5-diketo-D-gluconate is achieved by the recombinant enzyme introduced into other bacteria lacking of cytoplasm metabolic pathway of it. Membrane-bound 2-keto-D-gluconate dehydrogenase gene from Erwinia herbicola ATCC 08111 is isolated from cosmid library and sub cloned into PSTV28 for sequencing. The 2-keto-D-gluconate dehydrogenase gene is cloned into pKI111 and transformed into E. coli. The recombinant E.coli is cultured in LB media containing 2-keto-D-gluconate for 24hrs. Bio transformation takes place at per plasma of E.coli and conversion reaction is very fast.