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Updated: May 10, 2026

A Comparative Approach to Characterize the Landscape of Host-Pathogen Protein-Protein Interactions

A Comparative Approach to Characterize the Landscape of Host-Pathogen Protein-Protein Interactions

Published on: July 18, 2013

A call to order at the spirochaetal host-pathogen interface.

Wolfram R Zückert¹

¹Department of Microbiology, Molecular Genetics and Immunology, University of Kansas School of Medicine, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA. wzueckert@kumc.edu

Molecular Microbiology

|June 12, 2013

Summary

Proper sequential expression of OspC and VlsE lipoproteins is crucial for Borrelia burgdorferi survival during mammalian infection. This study clarifies their distinct roles, challenging previous assumptions of functional redundancy in Lyme disease pathogenesis.

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Using a Bacterial Pathogen to Probe for Cellular and Organismic-level Host Responses

Using a Bacterial Pathogen to Probe for Cellular and Organismic-level Host Responses

Published on: February 22, 2019

Area of Science:

Microbiology
Pathogen Biology
Molecular Biology

Background:

Borrelia burgdorferi, the Lyme disease spirochaete, navigates diverse environments between tick vectors and mammalian hosts.
Surface lipoproteins like OspC and VlsE are key virulence factors, mediating host interactions and immune evasion through phase and antigenic variation.

Purpose of the Study:

To investigate the specific roles and sequential expression of OspC and VlsE lipoproteins during mammalian infection by Borrelia burgdorferi.
To re-evaluate the functional redundancy among Borrelia burgdorferi surface lipoproteins in the context of host-pathogen interactions.

Main Methods:

Utilized promoter fusions to analyze gene expression patterns in vivo.
Employed a sensitive 'use it or lose it' gene complementation assay to assess lipoprotein function during infection.
Compared findings in immunocompetent and immunodeficient models to determine ecological relevance.

Main Results:

Demonstrated that sequential expression of OspC followed by VlsE is critical for Borrelia burgdorferi virulence.
Showed that functional redundancy between OspC, VlsE, and other lipoproteins is limited and context-dependent, particularly in immunodeficient hosts.
Confirmed OspC's essential role in initial infection and VlsE's role in enabling pathogen persistence through antigenic variation.

Conclusions:

OspC and VlsE have distinct, non-redundant functions essential for Borrelia burgdorferi's lifecycle in the mammalian host.
The sequential expression of these lipoproteins is a tightly regulated process vital for successful Lyme disease pathogenesis.
Findings highlight the importance of studying pathogen virulence in ecologically relevant (immunocompetent) models.