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The β₃-integrin ligand of Borrelia burgdorferi is critical for infection of mice but not ticks. Mol Microbiol 2012 Sep;85(6):1105-18 PMID: 22758390 PMCID: PMC3438374

Pubmed ID



P66 is a Borrelia burgdorferi surface protein with β₃ integrin binding and channel forming activities. In this study, the role of P66 in mammalian and tick infection was examined. B. burgdorferiΔp66 strains were not infectious in wild-type, TLR2⁻/⁻- or MyD88⁻/⁻-deficient mice. Strains with p66 restored to the chromosome restored near wild-type infectivity, while complementation with p66 on a shuttle vector did not restore infectivity. Δp66 mutants are cleared quickly from the site of inoculation, but analyses of cytokine expression and cellular infiltrates at the site of inoculation did not reveal a specific mechanism of clearance. The defect in these mutants cannot be attributed to nutrient limitation or an inability to adapt to the host environment in vivo as Δp66 bacteria were able to survive as well as wild type in dialysis membrane chambers in the rat peritoneum. Δp66 bacteria were able to survive in ticks through the larva to nymph moult, but were non-infectious in mice when delivered by tick bite. Independent lines of evidence do not support any increased susceptibility of the Δp66 strains to factors in mammalian blood. This study is the first to define a B. burgdorferi adhesin as essential for mammalian, but not tick infection.

Author List

Ristow LC, Miller HE, Padmore LJ, Chettri R, Salzman N, Caimano MJ, Rosa PA, Coburn J


Jenifer Coburn PhD Professor in the Medicine department at Medical College of Wisconsin
Nita H. Salzman MD, PhD Professor in the Pediatrics department at Medical College of Wisconsin


2-s2.0-84866024708   35 Citations

MESH terms used to index this publication - Major topics in bold

Bacterial Adhesion
Bacterial Proteins
Borrelia burgdorferi
Disease Models, Animal
Gene Deletion
Genetic Complementation Test
Integrin beta3
Lyme Disease
Mice, Inbred C3H
Mice, Inbred C57BL
Protein Binding
Virulence Factors
jenkins-FCD Prod-297 dff1a717c492f00bf6291286365f1f4fe95208f1