The Lyme disease agent exploits a tick protein to infect the mammalian host

Nandhini Ramamoorthi, Sukanya Narasimhan, Utpal Pal, Fukai Bao, Xiaofeng F. Yang, Durland Fish, Juan Anguita, Michael V. Norgard, Fred S. Kantor, John F. Anderson, Raymond A. Koski, Erol Fikrig

Research output: Contribution to journalArticlepeer-review

386 Scopus citations


The Lyme disease agent, Borrelia burgdorferi, is maintained in a tick-mouse cycle. Here we show that B. burgdorferi usurps a tick salivary protein, Salp15 (ref. 3), to facilitate the infection of mice. The level of salp15 expression was selectively enhanced by the presence of B. burgdorferi in Ixodes scapularis, first indicating that spirochaetes might use Salp15 during transmission. Salp15 was then shown to adhere to the spirochaete, both in vitro and in vivo, and specifically interacted with B. burgdorferi outer surface protein C. The binding of Salp15 protected B. burgdorferi from antibody-mediated killing in vitro and provided spirochaetes with a marked advantage when they were inoculated into naive mice or animals previously infected with B. burgdorferi. Moreover, RNA interference-mediated repression of salp15 in I. scapularis drastically reduced the capacity of tick-borne spirochaetes to infect mice. These results show the capacity of a pathogen to use a secreted arthropod protein to help it colonize the mammalian host.

Original languageEnglish (US)
Pages (from-to)573-577
Number of pages5
Issue number7050
StatePublished - Jul 28 2005

ASJC Scopus subject areas

  • General


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