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• W2160350336 abstract "CS1 pili are important virulence factors of enterotoxigenic Escherichia coli strains associated with human diarrheal disease. They are the prototype for a family of pili that share extensive sequence similarity among their structural and assembly proteins. Only four linked genes, cooB, cooA, cooC, and cooD, are required to produce CS1 pili in E. coli K-12. To identify amino acids important for the function of the major pilin CooA, we used alanine substitution mutagenesis targeting conserved residues in the N and C termini of the protein. To test function, we examined cooA mutants for the ability to agglutinate bovine erythrocytes. Each hemagglutination-negative (HA(-)) cooA mutant was examined to identify its assembly pathway defect. CooA has been shown to be degraded in the absence of CooB (K. Voegele, H. Sakellaris, and J. R. Scott, Proc. Natl. Acad. Sci. USA 94:13257-13261, 1997). We found several HA(-) cooA mutants that produced no detectable CooA, suggesting that recognition by CooB is mediated by residues in both the N and C termini of CooA. In addition, we found that alanine substitution for some of the conserved residues in the C-terminal motif AGxYxG(x(6))T, which is found in all subunits of this pilus family, had no effect on pilus formation. However, alanine substitution for some of the alternating hydrophobic residues within this motif prevented CooA from interacting with CooD, which serves as both the tip adhesin and nucleation protein for pilus formation. Thus, it appears that some, but not all, of the residues in both the N and C termini of CooA play a critical role in the intermolecular interactions of the major pilin with the other structural and assembly proteins. We anticipate that the results obtained here for CS1 pili in enterotoxigenic E. coli will help develop an understanding of the pilus assembly pathway used by CS1 family members in several important human pathogens." @default.
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• W2160350336 date "2006-01-01" @default.
• W2160350336 modified "2023-09-26" @default.
• W2160350336 title "Assembly of CS1 Pili: the Role of Specific Residues of the Major Pilin, CooA" @default.
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• W2160350336 doi "https://doi.org/10.1128/jb.188.1.231-239.2006" @default.
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