Assembly of the asparagine- and glutamine-rich yeast prions into protein fibrils.
The proteins Ure2, Sup35 and Rnq1 from the baker's yeast have infectious properties, termed prions, at the origin of heritable and transmissible phenotypic changes. It is widely believed that prion properties arise from the assembly of Ure2p, Sup35p and Rnq1p into insoluble fibrils. Yeast prions possess regions crucial for their propagation that can be either N- or C-terminal. These regions have unusual amino acid composition. They are very rich in glutamine and asparagine residues and resemble in that to huntingtin, a protein involved in the neurodegenerative Huntington's disease. Yeast prions assembly process has been hypothesized to be the consequence of the properties of glutamines and asparagines to engage in polar protein-protein interactions, termed polar-zippers. While this can certainly occur under certain conditions, glutamine and asparagine residues can establish other kinds of interactions with a variety of amino acid residues thus mediating protein-protein interactions involved in the assembly of polypeptide chains into high molecular weight oligomers. This review details the interactions that can be established by glutamine and asparagine residues that may allow a better understanding of their role in mediating protein-protein interactions and prion propagation.
Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, Gif-sur-Yvette, France.
Luc
L
Bousset
Jimmy
J
Savistchenko
Ronald
R
Melki
D000595:Amino Acid Sequence; D001216:Asparagine / Q000737:chemistry*; D005973:Glutamine / Q000737:chemistry*; D005979:Glutathione Peroxidase; D008969:Molecular Sequence Data; D010454:Peptide Termination Factors; D011328:Prions / Q000737:chemistry* / Q000235:genetics; D011487:Protein Conformation; D017510:Protein Folding; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000235:genetics; D015003:Yeasts
D010454:Peptide Termination Factors; D011328:Prions; C404807:RNQ1 protein, S cerevisiae; C068068:SUP35 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D005973:Glutamine; D001216:Asparagine; D005979:Glutathione Peroxidase; C067020:URE2 protein, S cerevisiae