Structural Basis for the Broad Specificity to Host- Cell Ligands by the Pathogenic Fungus Candida Albicans.Salgado, P.S., Yan, R., Taylor, J.D., Burchell, L., Jones, R., Hoyer, L.L., Matthews, S.J., Simpson, P.J., Cota, E.
(2011) Proc.Natl.Acad.Sci.USA 108: 15775
- PubMed: 21896717
- DOI: 10.1073/pnas.1103496108
- Primary Citation of Related Structures:
- PubMed Abstract:
Candida albicans is the most prevalent fungal pathogen in humans and a major source of life-threatening nosocomial infections. The Als (agglutinin-like sequence) glycoproteins are an important virulence factor for this fungus and have been associated ...
Candida albicans is the most prevalent fungal pathogen in humans and a major source of life-threatening nosocomial infections. The Als (agglutinin-like sequence) glycoproteins are an important virulence factor for this fungus and have been associated with binding of host-cell surface proteins and small peptides of random sequence, the formation of biofilms and amyloid fibers. High-resolution structures of N-terminal Als adhesins (NT-Als; up to 314 amino acids) show that ligand recognition relies on a motif capable of binding flexible C termini of peptides in extended conformation. Central to this mechanism is an invariant lysine that recognizes the C-terminal carboxylate of ligands at the end of a deep-binding cavity. In addition to several protein-peptide interactions, a network of water molecules runs parallel to one side of the ligand and contributes to the recognition of diverse peptide sequences. These data establish NT-Als adhesins as a separate family of peptide-binding proteins and an unexpected adhesion system for primary, widespread protein-protein interactions at the Candida/host-cell interface.
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