DIHYDROFOLATE-REDUCTASE GENE AS A VERSATILE EXPRESSION MARKER

被引:29
作者
IWAKURA, M [1 ]
TANAKA, T [1 ]
机构
[1] UNIV TOKAI,SCH MARINE SCI & TECHNOL,DEPT MARINE SCI,SHIMIZU,SHIZUOKA 424,JAPAN
关键词
D O I
10.1093/oxfordjournals.jbchem.a123714
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The Escherichia coli dihydrofolate reductase (DHFR) gene has been used as a genetic marker specifying trimethoprim resistance (Tmp(R)). In order to use the DHFR gene as a versatile expression marker, we have constructed three types of plasmids: promoter cloning vector, terminator cloning vector, and the plasmid containing the DHFR gene cassette. In these systems, the selection of recombinant plasmids was carried out just by examining the Tmp(R) phenotype of the transformed cells. Then, levels of the enzymatic activity of DHFR were measured to evaluate the efficiency of promoters and terminators in the fused DNA fragment. An expression plasmid which resulted in the E. coli host cells being able to produce DHFR up to 20% of total cellular proteins was also constructed by changing the promoter and Shine-Dalgarno sequences of the DHFR gene.
引用
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页码:31 / 36
页数:6
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