title: Enterotoxigenic Escherichia coli CS6 gene products and their roles in CS6 structural protein assembly and cellular adherence.
abstract: Enterotoxigenic Escherichia coli (ETEC) produces a variety of colonization factors necessary for attachment to the host cell, among which CS6 is one of the most prevalent in ETEC isolates from developing countries. The CS6 operon is composed of 4 genes, cssA, cssB, cssC, and cssD. The molecular mechanism of CS6 assembly and cell surface presentation, and the contribution of each protein to the attachment of the bacterium to intestinal cells remain unclear. In the present study, a series of css gene-deletion mutants of the CS6 operon were constructed in the ETEC genetic background, and their effect on adhesion to host cells and CS6 assembly was studied. Each subunit deletion resulted in a reduction in the adhesion to intestinal cells to the same level of laboratory E. coli strains, and this effect was restored by complementary plasmids, suggesting that the 4 proteins are necessary for CS6 expression. Bacterial cell fractionation and western blotting of the mutant strains suggested that the formation of a CssA-CssB-CssC complex is necessary for recognition by CssD and transport of CssA-CssB to the outer membrane as a colonization factor.
authors: Research Institute, National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo 162-8655, Japan.
authors: Takeaki
authors: T
authors: Wajima
authors: Subrata
authors: S
authors: Sabui
authors: Megumi
authors: M
authors: Fukumoto
authors: Shigeyuki
authors: S
authors: Kano
authors: Thandavarayan
authors: T
authors: Ramamurthy
authors: Nabendu Sekhar
authors: NS
authors: Chatterjee
authors: Takashi
authors: T
authors: Hamabata
mesh_terms: D018829:Adhesins, Bacterial / Q000235:genetics / Q000378:metabolism*; D000942:Antigens, Bacterial / Q000235:genetics / Q000378:metabolism*; D001422:Bacterial Adhesion; D002460:Cell Line; D054307:Enterotoxigenic Escherichia coli / Q000235:genetics / Q000472:pathogenicity*; D029968:Escherichia coli Proteins / Q000235:genetics / Q000378:metabolism*; D017353:Gene Deletion; D005798:Genes, Bacterial; D005816:Genetic Complementation Test; D006801:Humans; D009876:Operon; D055503:Protein Multimerization
chemical_list: D018829:Adhesins, Bacterial; D000942:Antigens, Bacterial; C098406:CS6 antigen, E coli; D029968:Escherichia coli Proteins