Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 279, Issue 40, Pages 41706-41714Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M401691200
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- NIAID NIH HHS [AI20624] Funding Source: Medline
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BBK32 is a fibronectin-binding lipoprotein on Borrelia burgdorferi, the causative agent of Lyme disease. Analysis using secondary structure prediction programs suggested that BBK32 is composed of two domains, an N-terminal segment lacking well defined secondary structure and a C-terminal segment composed largely of alpha-helices. Analysis of purified recombinant forms of the two domains by circular dichroism spectroscopy, gel permeation chromatography, and intrinsic viscosity determination were consistent with an N-terminal-extended, unstructured segment and a C-terminal globular domain in BBK32. Solid phase binding experiments suggest that the unstructured N-terminal domain binds fibronectin. Analysis of changes in circular dichroism spectra of the N-terminal segment of BBK32 upon binding of the N-terminal domain of fibronectin revealed an increase in beta-sheet content in the complex. Hence, BBK32, which belongs to a different family of proteins and shows no overall sequence similarity with the fibronectin binding MSCRAMMs (microbial surface components recognizing adhesive matrix molecules) of Gram-positive bacteria, binds fibronectin by a mechanism that is reminiscent of the tandem beta-zipper previously demonstrated for the fibronectin binding of streptococcal adhesins (Schwarz-Linek, U., Werner, J.M., Pickford, A. R., Gurusiddappa, S., Kim, J.H., Pilka, E. S., Briggs, J.A., Gough, T. S., Hook, M., Campbell, I. D., and Potts, J.R. (2003) Nature 423, 177-181).
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