The cytotoxic Staphylococcus aureus PSMα3 reveals a cross-α amyloid-like fibril

Amyloids are ordered protein aggregates, found in all kingdoms of life, and are involved in aggregation diseases as well as in physiological activities. In microbes, functional amyloids are often key virulence determinants, yet the structural basis for their activity remains elusive. We determined t...

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Veröffentlicht in:Science (American Association for the Advancement of Science) Jg. 355; H. 6327; S. 831
Hauptverfasser: Tayeb-Fligelman, Einav, Tabachnikov, Orly, Moshe, Asher, Goldshmidt-Tran, Orit, Sawaya, Michael R, Coquelle, Nicolas, Colletier, Jacques-Philippe, Landau, Meytal
Format: Journal Article
Sprache:Englisch
Veröffentlicht: United States 24.02.2017
Schlagworte:
Amyloid - chemistry
Amyloid - metabolism
Bacterial Toxins - chemistry
Bacterial Toxins - metabolism
Cells, Cultured
Crystallography, X-Ray
Humans
Protein Conformation
Staphylococcus aureus - metabolism
Staphylococcus aureus - pathogenicity
T-Lymphocytes - microbiology
ISSN:1095-9203, 1095-9203
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Zusammenfassung:Amyloids are ordered protein aggregates, found in all kingdoms of life, and are involved in aggregation diseases as well as in physiological activities. In microbes, functional amyloids are often key virulence determinants, yet the structural basis for their activity remains elusive. We determined the fibril structure and function of the highly toxic, 22-residue phenol-soluble modulin α3 (PSMα3) peptide secreted by PSMα3 formed elongated fibrils that shared the morphological and tinctorial characteristics of canonical cross-β eukaryotic amyloids. However, the crystal structure of full-length PSMα3, solved de novo at 1.45 angstrom resolution, revealed a distinctive "cross-α" amyloid-like architecture, in which amphipathic α helices stacked perpendicular to the fibril axis into tight self-associating sheets. The cross-α fibrillation of PSMα3 facilitated cytotoxicity, suggesting that this assembly mode underlies function in .
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1095-9203
1095-9203
DOI:10.1126/science.aaf4901