Complement factor H binding by different Lyme disease and relapsing fever Borrelia in animals and human

Area of Science:

• Microbiology
• Immunology
• Protein Biochemistry

Background:

• Borrelia species utilize immune evasion tactics, including binding complement regulatory proteins like factor H (fH).
• fH binding by Borrelia is linked to disease severity and host specificity.
• Understanding these interactions is key to combating Borrelia infections.

Purpose of the Study:

• To identify novel Borrelia proteins that bind to human and animal factor H (fH).
• To investigate the differential binding of Borrelia proteins to fH from various hosts.
• To explore the role of fH binding in Borrelia pathogenesis and host adaptation.

Main Methods:

• Affinity ligand binding assays.
• Two-dimensional (2-D) electrophoresis.
• Mass spectrometry for protein identification and peptide sequencing.

Main Results:

• Novel putative factor H binding proteins (FHBPs) were identified in Lyme and relapsing fever Borrelia.
• Differential binding of fH by Borrelia garinii was observed, associated with specific OspA serotypes and tissue invasion.
• Variable binding affinities to animal fH correlated with host selectivity in different Borrelia species.

Conclusions:

• The identified novel animal and human fH binding proteins highlight the significance of complement evasion in Borrelia pathogenesis.
• These findings provide insights into host-pathogen interactions and Borrelia's adaptation strategies.