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Volume 145, Issue 9

Matrix-binding proteins of : functional analysis of mutant and hybrid molecules Free

Abstract

The fibrinogen-binding protein ClfA and the collagen-binding protein Cna are surface-associated adhesins of . ClfA has a dipeptide repeat region R composed mainly of serine and aspartate residues, more than 40 of which are required along with the 28-residue region W, the LPXTG motif and region M to display the ligand-binding region A on the cell surface in a functional form. Cna has a 61-residue region W and at least one 187-residue region B linking the collagen-binding region A to peptidoglycan. A mutant of lacking region B was shown to bind collagen at the same level as wild-type Cna cells, indicating that region B is not necessary for ligand binding. Furthermore, altering the number of B repeats did not influence the level of collagen binding. In order to study the ability of C-terminal domains of Cna and ClfA to support functional ligand-binding activity of different adhesins, chimeric proteins were constructed and expressed in . Surprisingly, the presence of a single Cna B domain and a nonapeptide linker located between ClfA region A and Cna region WM failed to support fibrinogen binding by cells, despite the fact that ClfA region A was detected on the bacterial surface by immunoblotting. In contrast, the ClfA region A–Cna region B hybrid expressed as a recombinant protein in did bind fibrinogen in Western ligand blots and in an ELISA-type assay. It is concluded that Cna region B cannot support functional display of ClfA region A on the bacterial cell surface. However, the ClfA dipeptide repeat region R and region WM did promote functional surface expression of the Cna collagen-binding domain in a hybrid Cna–ClfA protein.

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Keyword(s): clumping factor , collagen-binding protein , dipeptide repeat , fibrinogen-binding protein and Staphylococcus aureus
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1999-09-01
2025-01-20
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Matrix-binding proteins of Staphylococcus aureus: functional analysis of mutant and hybrid molecules
Microbiology 145, 2497 (1999); https://doi.org/10.1099/00221287-145-9-2497
/content/journal/micro/10.1099/00221287-145-9-2497
/content/journal/micro/10.1099/00221287-145-9-2497
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