Journal article
Identification of a fibronectin-binding domain within the Campylobacter jejuni CadF protein
Molecular microbiology, Vol.57(4), pp.1022-1035
08/2005
Handle:
https://hdl.handle.net/2376/108801
PMID: 16091041
Abstract
The binding of Campylobacter jejuni to fibronectin (Fn), a component of the extracellular matrix, is mediated by a 37 kDa outer membrane protein termed CadF for Campylobacter adhesion to Fn. Previous studies have indicated that C. jejuni binds to Fn on the basolateral surface of T84 human colonic cells. To further characterize the interaction of the CadF protein with Fn, enzyme-linked immunosorbent assays were performed to identify the Fn-binding domain (Fn-BD). Using overlapping 30-mer and 16-mer peptides derived from translated cadF nucleotide sequence, maximal Fn-binding activity was localized to four amino acids (AA 134-137) consisting of the residues phenylalanine-arginine-leucine-serine (FRLS). A mouse alpha-CadF peptide polyclonal antibody (M alpha-CadF peptide pAb) was generated using FRLS containing peptides and found to react with viable C. jejuni as judged by indirect fluorescent microscopy, suggesting that the FRLS residues are surface-exposed. Binding of CadF to purified Fn and INT 407 human epithelial cells was significantly inhibited with peptides containing the Fn-BD. Moreover, a CadF recombinant variant protein, in which the Phe-Arg-Leu residues (CadF AA 134-136) were altered to Ala-Ala-Gly, exhibited a 91% decrease in Fn-binding activity as compared with the wild-type CadF protein. Collectively, these data indicate that the FRLS residues (CadF AA 134-137) of the C. jejuni CadF protein possess Fn-binding activity.
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Details
- Title
- Identification of a fibronectin-binding domain within the Campylobacter jejuni CadF protein
- Creators
- Michael E Konkel - School of Molecular Biosciences, Washington State University, Pullman, WA 99164-4234, USA. konkel@mail.wsu.eduJeffrey E ChristensenAmy M KeechMarshall R MontevilleJohn D KlenaSteve G Garvis
- Publication Details
- Molecular microbiology, Vol.57(4), pp.1022-1035
- Academic Unit
- Molecular Biosciences, School of
- Publisher
- England
- Grant note
- DK58911 / NIDDK NIH HHS
- Identifiers
- 99900547133101842
- Language
- English
- Resource Type
- Journal article