Endogenous and Borrowed Proteolytic Activity in the Borrelia

Area of Science:

• Microbiology
• Molecular Biology
• Pathogenesis

Background:

• Borrelia species are tick-borne spirochetes causing Lyme disease and relapsing fever.
• These bacteria undergo significant physiological changes during their life cycle between ticks and vertebrates.
• Outer membrane remodeling and proteome changes are critical for adaptation.

Purpose of the Study:

• To investigate the role of proteolysis in Borrelia spp. physiology and pathogenesis.
• To understand how Borrelia utilizes proteolytic systems for host-pathogen interactions.
• To explore the mechanisms of Borrelia invasiveness related to proteolysis.

Main Methods:

• Analysis of Borrelia burgdorferi genome for proteolytic enzymes.
• Investigation of ATP-dependent proteases and their function.
• Study of Borrelia's interaction with the mammalian plasminogen-activating system.

Main Results:

• Borrelia spp. possess a substantial repertoire of proteases, including ATP-dependent ones.
• Proteolysis is crucial for protein turnover during host and vector transitions.
• Borrelia recruits host plasminogen system components, gaining proteolytic capabilities for tissue invasion.

Conclusions:

• Energy-driven proteolysis is a key physiological adaptation for Borrelia.
• The bacterium's proteolytic arsenal facilitates movement through host tissues.
• Recruitment of host plasminogen enhances Borrelia invasiveness and systemic spread.