Cloning and Expression of a Gene Encoding N-Glycosyltrasferase (ngt) from Saccharothrix aerocolonigenes ATCC39243.
作者:TAKESHI OHUCHI、ATSUKO IKEDA-ARAKI、AYAKO WATANABE-SAKAMOTO、KATSUHISA KOJIRI、MASAO NAGASHIMA、MASANORI OKANISHI、HIROYUKI SUDA
DOI:10.7164/antibiotics.53.393
日期:——
In the course of our bioconversion studies on the derivatives of an indolocarbazole, J-104303, Saccharothrix aerocolonigenes ATCC39243 was found to convert J-104303, which was added into the culture medium, to its glycosylated derivative, J-1093 84. In order to clone the gene having the ability to convert J-104303 to J-109384, a library of Saccharothrix aerocolonigenes ATCC39243 DNA fragments was constructed using Streptomyces lividans TK21 and pIJ702 as host strain and vector, respectively. By examining more than 5, 000 transformants, one was found to convert J-104303 to J-109384. Sequence analysis of the inserted DNA fragment revealed an open reading frame with 1, 245 base pairs, named ngt. The transformant containing this ngt gene was also found to introduce a D-glucose moiety into 6-N-methylarcyriaflavin C. Furthermore, when ngt was introduced into Streptomyces mobaraensis BA13793, a producer of J-104303, the resulting transformant produced J-109384 directly.
在对吲哚咔唑衍生物J-104303进行生物转化研究的过程中,发现糖化链霉菌ATCC39243能够将培养基中的J-104303转化为其糖基化衍生物J-109384。为了克隆能够将J-104303转化为J-109384的基因,我们分别以链霉菌TK21和pIJ702为宿主菌株和载体,构建了糖化链霉菌ATCC39243 DNA片段文库。通过检测5000多个转化体,我们发现了一个能够将J-104303转化为J-109384的转化体。插入DNA片段的序列分析显示,其包含一个1245个碱基对的开放阅读框,命名为ngt。我们还发现,含有ngt基因的转化体能够将D-葡萄糖部分引入6-N-甲基紫花黄素C中。此外,当将ngt引入J