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Effect of fur on pyrC Gene Expression
Sangho Chai,Chang Kyu Song,Seong Kwun Kim,Jun Ho Park,Sechan Wee 한국미생물학회 2007 The journal of microbiology Vol.45 No.6
The promoter region of pyrC (dihydroorotase) gene of Escherichia coli was shown to have Fur protein binding properties by gel retardation assay. In vivo regulation of the pyrC expression was studied by measuring dihydroorotase activity and β-galactosidase level in the fur+ and fur- genetic background. The expression of chromosomal dihydroorotase activity and β-galactosidase activity of pyrC-lacZ fusion plasmid was repressed to about 30% and 17%, respectively in the fur+ strain compared to those in the fur- strain. Divalent ions such as Fe2+ and Zn2+ were not required for the repression. PyrC expression was also reduced to one half by 1 mM uracil. The effect of uracil was independent on the fur gene.