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Updated: Apr 15, 2026

Purification of Hsp104, a Protein Disaggregase
Published on: September 30, 2011
[Modification of [PSI+] prion properties by the combination of amino acid changes within Sup35 protein N-domain]
Abstract:
[PSI+] prion is an amyloid isoform of a release factor Sup35p (eRF3). The structure of these protein aggregates remains unclear despite a long term history of prion amyloids investigations. The N-terminal domain of Sup35p (which is responsible for a propagation of prion) shapes superpleated beta-structure, according to modern concepts. Recently we constructed five double mutations within SUP35 sequence encoding the N-terminal prion-forming domain and investigated properties of mutant proteins. Mutations sup35-M1 (YQ46-47KK) and sup35-M2 (QQ61-62KK) lead to [PSI+] prion loss, while other mutant alleles (sup35-M3 QQ70-71KK; sup35-M4 QQ80-81KK; sup35-M5 QQ89-90KK) maintained prion. For the detail analysis of effects of mutant alleles on Sup35p aggregation we characterized propagation and properties of [PSI] prion in yeast strains bearing different mutant allele combinations. The data obtained have refined a supposed organization of beta-sheets forming by different regions of Sup35p prion-forming domain within amyloid. Also we obtained evidences that mutant sup35-M2 and sup35-M4 alleles change structure of prion aggregates. The prion destabilization by these mutations possibly is connected with decrease of heteroaggregate fragmentation by chaperones.
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