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Cloning and Expression of Glucose-1-Phosphate Thymidylyltransferase Gene (schS6) from Streptomyces sp. SCC-2136  

Han, Ji-Man (Department of Biochemistry and Molecular Biology, University of Ulsan, College of Medicine)
Kim, Su-Min (Department of Pharmacy, Chosun University)
Lee, Hyo-Jung (Department of Pharmacy, Chosun University)
Yoo, Jin-Cheol (Department of Pharmacy, Chosun University)
Publication Information
Journal of Microbiology and Biotechnology / v.17, no.4, 2007 , pp. 685-690 More about this Journal
Abstract
The deoxysugar biosynthetic gene cluster of Sch 47554/Sch 47555 was cloned from Streptomyces sp. SCC-2136. One of the ORFs, schS6, appeared to encode glucose-1-phosphate thymidylyltransferase, which converts dTTP and glucose-1-phosphate to TDP-D-glucose and pyrophosphate. The dTDP-D-glucose is a key metabolite in prokaryotics as a precursor for a large number of modified deoxysugars, and these deoxysugars are a maj or part of various antibiotics, ranging from glycosides to macrolides. SchS6 was expressed in E. coli vector pSCHS6 and the expressed protein was purified to apparent homogeneity by ammonium sulfate precipitation and Ni-NTA affinity column chromatography. The specific activity of the purified enzyme increased 4.7-fold with 17.5% recovery. It migrated as a single band on SDS-PAGE with an apparent molecular mass of 56kDa. The purified protein showed glucose-1-phosphate thymidylyltransferase activity, catalyzing a reversible bimolecular group transfer reaction. In the forward reaction, the highest activity was obtained with combination of dTTP and ${\alpha}-D-glucose-1-phosphate$, and only 12% of that activity was obtained with the substrates $UTP/{\alpha}-D-glucose-1-phosphate$. In the opposite direction, the purified protein was highly specific for dTDP-D-glucose and pyrophosphate.
Keywords
Deoxysugar; glucose-1-phosphate thymidylyl-transferase; Sch 47554; Streptomyces sp. SCC-2136;
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