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자료유형
학술저널
저자정보
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한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제16권 제4호
발행연도
2006.1
수록면
619 - 622 (4page)

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Biotransformation is a good tool to synthesizeregioselective compounds. It could be performed with diversesources of genes, and microorganisms provide a myriad ofgene sources for biotransformation. We were interested inmodification of flavonoids, and therefore, we cloned a putativeO-methyltransferase from Bacilus cereus, BcOMT-2. It has a668-bp open reading frame that encodes a 24.6-kDa protein.In order to investigate the modification reaction mediated byBcOMT-2, it was expressed in E. coli as a His-tag fusion proteinand purified to homogeneity. Several substrates such as naringenin,luteolin, kaempferol, and quercetin were tested and reactionproducts were analyzed by thin layer chromatography (TLC)and high performance liquid chromatography (HPLC). BcOMT-2 could transfer a methyl group to substrates that have a 3'Comparison of the HPLC retention time and UV spectrum ofthe quercetin reaction product with corresponding authentic3'-methylated and 4'-methylated compounds showed that themethylation position was at either the 3'-hydroxyl or 4'-hydroxyl group. Thus, BcOMT-2 transfers a methyl groupeither to the 3'-hydroxyl or 4'-hydroxyl group of flavonoidswhen both hydroxyl groups are available. Among severalflavonoids that contain a 3'- and 4'-hydroxyl group, fisetin

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