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. 1986 Jul;167(1):243–250. doi: 10.1128/jb.167.1.243-250.1986

Nucleotide sequence of the gene encoding the two-subunit pilin of Bacteroides nodosus 265.

T C Elleman, P A Hoyne, N M McKern, D J Stewart
PMCID: PMC212867  PMID: 2873127

Abstract

The nucleotide sequence of the gene encoding pilin from Bacteroides nodosus 265 has been determined. The pilin is encoded by a single-copy gene, from which can be predicted a prepilin comprising a single protein chain of Mr 16,637. The prepilin sequence differs in several respects from the mature protein sequence. Seven additional N-terminal amino acid residues are present in prepilin, whereas residue 8, phenylalanine, undergoes posttranslational modification to become the N-methylated amino-terminal residue of mature pilin. In addition, further processing occurs through internal cleavage to produce two noncovalently linked subunits characteristic of pilins from serogroup H of B. nodosus, of which strain 265 is a member. The position of cleavage has been identified between alanine residues at positions 72 and 73 of the mature 149-residue pilin protein. The predicted pilin sequence of B. nodosus 265 shows extensive N-terminal amino acid sequence homology with other pilins of the N-methylphenylalanine type. In addition this sequence also shows homology with these N-methylphenylalanine-type pilins in the C-terminal region of the molecule, especially with pilin from Pseudomonas aeruginosa PAK.

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Selected References

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