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. 1993 Sep;175(17):5395–5402. doi: 10.1128/jb.175.17.5395-5402.1993

Comparative analysis of flagellin sequences from Escherichia coli strains possessing serologically distinct flagellar filaments with a shared complex surface pattern.

G Schoenhals 1, C Whitfield 1
PMCID: PMC206594  PMID: 8366026

Abstract

Escherichia coli morphotype E flagellar filaments have a characteristic surface pattern of short-pitch loops when examined by electron microscopy. Seven of the 50 known E. coli H (flagellar antigen) serotypes (H1, H7, H12, H23, H45, H49, and H51) produce morphotype E filaments. Polymerase chain reaction was used to amplify flagellin structural (fliC) genes from E. coli strains producing morphotype E flagellar filaments and from strains with flagellar filaments representing other morphotypes. A single DNA fragment was obtained from each strain, and the size of the amplified DNA correlated with the molecular mass of the corresponding flagellin protein. This finding and hybridization data suggest that these bacteria are monophasic. fliC genes from three E. coli serotypes (H1, H7, and H12) possessing morphotype E flagellar filaments were sequenced in order to assess the contribution of conserved flagellin primary sequence to the characteristic filament architecture. The H1 and H12 fliC sequences were identical in length (1,788 bp), while the H7 fliC sequence was shorter (1,755 bp). The deduced molecular masses of the FliC proteins were 60,857 Da (H1), 59,722 Da (H7), and 60,978 Da (H12). The H1, H7, and H12 flagellins demonstrated 98 to 99% identity over the amino-terminal region (190 amino acid residues) and 89% (H7) to 99% (H1 and H12) identity in the carboxy-terminal region (100 amino acid residues). The complete primary amino acid sequences for H1 and H12 flagellins differed by only 10 amino acids, accounting for previously reported serological cross-reactions. However, the central region of H7 flagellin had only 38% identity with H1 and H12 flagellins.The characteristic morphology of morphotype E flagellar filaments is therefore not dependent on a highly conserved primary sequence within the exposed central region. Comparison of morphotype E E. coli flagellins with those from E. coli K-12, Serratia marcescens, and several Salmonella serovars supported the established concept of highly conserved terminal regions flanking a variable central region.

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Selected References

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