Abstract
The genetic organization of a segment of recombinant DNA conferring the capacity of synthesize E. coli type 1 pili was examined. This 11.2-kilobase (kb) segment of DNA, derived from a clinical isolate, conferred a piliated phenotype (Pil+) on a nonpiliated (Pil-) strain of E. coli K-12 that lacked DNA homologous to the 11.2-kb region. Insertional mutagenesis, deletion mutagenesis, and subcloning of various regions of the 11.2-kb fragment allowed the localization of five genes, each encoding a polypeptide, that were associated with pilus expression. Three gene products, 17, 86, and 30 kilodaltons (kd) in size, were involved in pilus assembly; assembly of the 17-kd structural (pilin) protein into pili was not seen in mutants lacking either the 86- or 30-kd proteins, but pilin synthesis and proteolytic processing were not affected. The fourth polypeptide, 23 kd in size, appeared to be involved in the regulation of pilus expression because mutants lacking this protein exhibited a 40-fold increase in the amount of pilin antigen per cell. The last protein, 14 kd in size, was not associated with piliation by genetic criteria; however, the 14-kd protein was immunoprecipitated with pili, suggesting an association with pili or immunological cross-reactivity with pilin. Immunoprecipitates of minicell transcription translation products revealed that pilus polymerization was taking place in minicells. This may facilitate the study of the molecular steps in pilus biosynthesis and, as a consequence, provide clues to the assembly of supramolecular structures in general.
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Selected References
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