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. 1983 Nov;42(2):755–762. doi: 10.1128/iai.42.2.755-762.1983

Isolation and characterization of Escherichia coli pili from diverse clinical sources.

I E Salit, J Vavougios, T Hofmann
PMCID: PMC264494  PMID: 6139339

Abstract

Bacteria which attach to different mucous membranes should have differing specificities of adherence in vitro. Human Escherichia coli isolates from blood and urine (pathogens) and from stool and throat (commensals) were characterized as to the patterns of hemagglutination (HA), as well as the structure and function of their pili. Bacterial HA was done in microtiter plates and on slides after bacterial growth in broth or agar. Human erythrocytes were agglutinated by 95% of the pathogens and 65 to 70% of the commensals grown in broth or agar. Mannose-resistant HA was characteristically caused by pathogens, and commensals characteristically caused mannose-sensitive HA of guinea pig cells. Strains often had both mannose-resistant and mannose-sensitive reactions, or even a mannose-paradoxical reaction. Pathogens more often caused HA, but titers were lower than those for commensals. Slide HA was less sensitive than the microtiter method. All isolates were piliated. Commensals also had more pili than pathogens when grown in broth (117.8 versus 38.3 pili per bacterium), but pathogens had more pili after growth on agar (32.1 versus 8.1 pili per bacterium). Isolates causing high-titer HA had large numbers of pili (greater than 85 pili per bacterium), but some well-piliated strains were non-hemagglutinating. Pili were purified from seven E. coli strains from different sites of isolation and with different erythrocyte-binding specificity. Pili usually migrated as a single band on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. However, more than one type of pilus could be copurified from some strains since there were two or more bands after separation in octyl-glucoside and two different amino terminal sequences. Protein sequencing was done on five different pili: four resembled type 1 pili and one was a P fimbria. The type 1-like pili (strains 2239 and 9353) had an initial variable sequence of 1 to 5 residues, followed by a common region of 21 residues. The P fimbria (strain 7714) had different erythrocyte-binding specificity but was still 27% homologous with 2239 and 9353. E. coli strains from different body sites have characteristic attachments to erythrocytes. Pili derived from these different sources may also have different binding specificity, but they are similar in primary structure.

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Selected References

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