Functional insights into recombinant TROSPA protein from Ixodes ricinus

Area of Science:

• Veterinary Entomology
• Microbiology
• Immunology

Background:

• Lyme disease, or borreliosis, is a tick-borne illness caused by Borrelia burgdorferi.
• The tick protein TROSPA is essential for Borrelia colonization in the vector tick.
• Ixodes ricinus is a key vector for Lyme disease in Europe.

Purpose of the Study:

• To investigate the interaction between Ixodes ricinus TROSPA and Borrelia OspA.
• To evaluate the immunogenic potential of recombinant I. ricinus TROSPA.
• To assess TROSPA as a potential vaccine candidate against Lyme disease in animals.

Main Methods:

• Characterization of recombinant TROSPA protein from I. ricinus.
• Analysis of TROSPA's interaction with OspA from various Borrelia species.
• Oral immunization of rats with recombinant TROSPA and measurement of IgG levels.

Main Results:

• The N-terminal domain of TROSPA is not involved in OspA binding.
• Reduced negative charge on TROSPA impairs its binding to OspA.
• Recombinant TROSPA forms a complex with OspA and induces a significant IgG response in rats.

Conclusions:

• Ixodes ricinus TROSPA retains its capacity to complex with OspA.
• TROSPA elicits a notable immune response, indicating its potential as a vaccine component.
• I. ricinus TROSPA is a promising candidate for developing animal vaccines against Borrelia infections.