The propagation of yeast prion phenotypes is highly dependent on molecular chaperones. We previously demonstrated that the molecular chaperone Ssa1p sequesters Ure2p in high molecular weight, assembly incompetent oligomeric species. We also determined the affinity of Ssa1p for Ure2p, and its globular domain. To map the Ure2p-Ssa1p interface, we have used chemical cross-linkers and MS. We demonstrate that Ure2p and Ssa1p form a 1: 1 complex. An analytical strategy combining in-gel digestion of cross-linked protein complexes, and both MS and MS/MS analysis of proteolytic peptides, allowed us to identify a number of peptides that were modified because they are exposed to the solvent. A difference in the exposure to the solvent of a single lysine residue, lysine 339 of Ure2p, was detected upon Ure2p-Ssa1p complex formation. These observations strongly suggest that lysine 339 and its flanking amino acid stretches are involved in the interaction between Ure2p and Ssa1p. They also reveal that the Ure2p amino-acid stretch spanning residues 327-339 plays a central role in the assembly into fibrils. Structured digital abstract * MINT-8044534: Ure2p (uniprotkb:Q8NJQ9) and Ure2p (uniprotkb:Q8NJQ9) bind (MI:0407) by cross-linking study (MI:0030) * MINT-8044522: Ssa1p (uniprotkb:C8Z3H3) and Ssa1p (uniprotkb:C8Z3H3) bind (MI:0407) by cross-linking study (MI:0030) * MINT-8043971, MINT-8043985, MINT-8044494, MINT-8044548: Ure2p (uniprotkb:Q8NJQ9) and Ssa1p (uniprotkb:C8Z3H3) bind (MI:0407) by cross-linking study (MI:0030).CI - (c) 2010 The Authors Journal compilation (c) 2010 FEBS.
|Evidence ID||Analyze ID||Interactor||Interactor Systematic Name||Interactor||Interactor Systematic Name||Type||Assay||Annotation||Action||Modification||Phenotype||Source||Reference||Note|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Gene Ontology Term||Gene Ontology Term ID||Qualifier||Aspect||Method||Evidence||Source||Assigned On||Reference||Annotation Extension|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Phenotype||Experiment Type||Experiment Type Category||Mutant Information||Strain Background||Chemical||Details||Reference|
|Evidence ID||Analyze ID||Regulator||Regulator Systematic Name||Target||Target Systematic Name||Experiment||Conditions||Strain||Source||Reference|