Edwardsiella tarda strains can be grouped into two types of human isolates and diseased fish isolates based on distribution of the wecC gene, type III and type VI secretion system genes, the groups are broadly clustered into two major subpopulations: EdwGI and EdwGII. Edwardsiella tarda EdwGI is composed of strains mainly isolated from fish, such as the turbot, striped bass, and Japanese eel, represents a genotype of fish pathogens, and possesses virulence-associated gene clusters such as T3SS and T6SS. Edwardsiella tarda EdwGII contains strains isolated from human feces, nonpathogenic strains to fish, and environmental strains, and lacks some important virulence-associated gene clusters including T3SS and T6SS
the enzyme is involved in synthesis of enterobacterial common antigen. The swarming and swimming abilities mediated by the wecC and fliF genes appears to be essential for penetration activity of Edwardsiella tarda through Caco-2 cell monolayers
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crystal structure of the enzyme bound to the product UDP-N-acetyl-alpha-D-mannosaminuronate by X-ray diffraction to resolution of 1.55 A. Crystal structures reveal a tight dimeric polymer chains with product-bound in all the structures. The catalytic residues Cys258 and Lys204 are conserved. The Cys258 acts as catalytic nucleophile and Lys204 as acid/base catalyst. The product directly interacts with residues Arg211, Thr249, Arg244, Gly255, Arg289, Lys319 and Arg398. The SeMet-substituted enzyme is crystallized using microbatch sitting method under reservoir solution condition 10% (w/v) PEG 8000, 8% (v/v) ethylene glycol and 0.1 M HEPES, pH 7.5