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홍성관(Sung Gwan Hong),전상훈(Sang Hoon Jeon),김하형(Ha Hyun Kim),공광훈(Kwang Hoon Kong) 대한약학회 2002 약학회지 Vol.46 No.4
The lectin gene from rice was amplified by the polymerase chain reaction. The amplified DNA was inserted into the expression vector pET26b and expressed it as a fusion protein with polyhistidine sequences in Escherichia coli. The recombinant protein was produced by induction with 0.4 Mm isopropyl-β-D- thiogalactopyranoside at 37oC and purified by an immobilized metal affinity chromatography; The recombinant protein was found to have lectin activity by the hemag- glutination inhibition assay; The hemagglutination activity of the recombinant protein was optimal at pH 4.0-7.0 and was dependent on Ca2+ and Mn2+.
최상숙(Sang Sook Choi),노향순(Hyang Soon Noh),조성희(Sung Hee Cho),공광훈(Kwang Hoon Kong) 대한약학회 2001 약학회지 Vol.45 No.5
Tyrosinase plays an important role in the process of melanin biosynthesis, and it is a biochemical target enzyme for skin-whitening agents and the remedy for disturbances in pigmentation. We have screened 25 natural plant extracts for inhibitory effects against DOPA oxidate activity of tyrosinase. For the inhibitory effect against DOFA oxidase activity of tyrosinase, the recombinant human tyrosinase and the purified mushroom tyrosinase were used. Each of the dried plants extracted with methanol, and then the extracts were subjected to sequential fractionations with methylene chloride, ethyl acetate, n-butanol and waters respectively, The methylene chloride fractions of Angelica tenuissima, Nardcstachys chinensis, Bombyx mori and Saposhnikovia divaricata, and the n-butanol fraction of Bombyx mori notably inhibited the human tyrosinase activity as well as mushroom tyrosinase activity (more than 90% inhibition). This study suggests that the above extracts have a potential as whitening agents as single ingredients or in combination with other of the extracts.