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https://www.selleckchem.com/products/cytidine.html The emergence of multidrug-resistant pathogens has motivated natural product research to inform the development of new antimicrobial agents. Glycocin F (GccF) is a diglycosylated 43-amino-acid bacteriocin secreted by Lactobacillus plantarum KW30. It displays a moderate phylogenetic target range that includes vancomycin-resistant strains of Enterococcus species and appears to have a novel bacteriostatic mechanism, rapidly inhibiting the growth of the most susceptible bacterial strains at picomolar concentrations. Experimental verification of the predicted role(s) of gcc cluster genes in GccF biosynthesis has been hampered by the inability to produce soluble recombinant Gcc proteins. Here, we report the development of pRV610gcc, an easily modifiable 11.2-kbp plasmid that enables the production of GccF in L. plantarum NC8. gcc gene expression relies on native promoters in the cloned cluster, and NC8(pRV610gcc) produces mature GccF at levels similar to KW30. Key findings are that the glycosyltransferase glycosylaes. In contrast to the refactoring approach, chemical synthesis, or chemoenzymatic synthesis, all of which have been successfully used to probe glycocin structure and function, this plasmid can also be used to probe in vivo the evolutionary constraints on glycocin scaffolds and their processing by the maturation pathway machinery, thus increasing understanding of the enzymes involved, the order in which they act, and how they are regulated.Members of Thermococcales harbor a number of genes encoding putative aminotransferase class III enzymes. Here, we characterized the TK1211 protein from the hyperthermophilic archaeon Thermococcus kodakarensis The TK1211 gene was expressed in T. kodakarensis under the control of the strong, constitutive promoter of the cell surface glycoprotein gene TK0895 (P csg ). The purified protein did not display aminotransferase activity but exhibited racemase activity. An examination of

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