Skip to main content
Article thumbnail
Location of Repository

The response regulator Rrp2 is essential for the expression of major membrane lipoproteins in Borrelia burgdorferi

By Xiaofeng F. Yang, Sophie M. Alani and Michael V. Norgard

Abstract

Borrelia burgdorferi (Bb), the agent of Lyme disease, exists in nature through a complex enzootic life cycle that involves both ticks and mammals. As Bb transitions between its two diverse niches, profound adaptive changes occur that are reflected in differential patterns of gene expression, particularly involving lipoprotein genes. Using a mutagenesis approach, we show that Rrp2 (gene BB0763), one of the proteins predicted by the Bb genome (www.tigr.org) to be a response regulator of a two-component sensory transduction system, is a pivotal regulator governing the expression of major membrane lipoproteins such as OspC, DbpA, and Mlp8, as well as many other mammalian infection-associated immunogens of Bb. Sequence analysis additionally suggested that Rrp2 is a bacterial enhancer-binding protein, essential for σ54-dependent gene activation. Mutagenesis of a key amino acid residue within a putative activation domain revealed that Rrp2 controlled lipoprotein expression by governing the expression of the alternative σ-factor σs in a σ54-dependent manner. We therefore propose a signal transduction pathway involving Rrp2, σ54, and σs, which in concert control the expression of key lipoproteins and other infection-associated immunogens in Bb

Topics: Biological Sciences
Publisher: National Academy of Sciences
Year: 2003
DOI identifier: 10.1073/pnas.1834315100
OAI identifier: oai:pubmedcentral.nih.gov:196916
Provided by: PubMed Central
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • www.tigr.org) (external link)
  • http://dx.doi.org/10.1073/pnas... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.