SUMMARY: The amino acid sequence of pilin protein from strain 216 was determined. The protein had a calculated molecular weight of 15962 and contained the same number of amino acid residues (151) as the pilin from the previously sequenced strain 198. The sequence of the first 44 residues was common to both strains, including the unusual amino-terminal amino acid, -methylphenylalanine. Of the remaining 107 residues, 37% of them differed between the two strains. Comparison of hydrophilicity profiles constructed from the sequence data indicated that a conserved region around residues 71-72 was probably the site of an antigenic determinant.


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