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10.1128/MCB.00206-17

http://scihub22266oqcxt.onion/10.1128/MCB.00206-17
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pmid28716950
      Mol+Cell+Biol 2017 ; 37 (20 ): ä
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  • Analysis of Small Critical Regions of Swi1 Conferring Prion Formation, Maintenance, and Transmission #MMPMID28716950
  • Valtierra S ; Du Z ; Li L
  • Mol Cell Biol 2017[Oct]; 37 (20 ): ä PMID28716950 show ga
  • Saccharomyces cerevisiae contains several prion elements, which are epigenetically transmitted as self-perpetuating protein conformations. One such prion is [SWI(+) ], whose protein determinant is Swi1, a subunit of the SWI/SNF chromatin-remodeling complex. We previously reported that [SWI(+) ] formation results in a partial loss-of-function phenotype of poor growth in nonglucose medium and abolishment of multicellular features. We also showed that the first 38 amino acids of Swi1 propagated [SWI(+)]. We show here that a region as small as the first 32 amino acids of Swi1 (Swi1(1-32)) can decorate [SWI(+)] aggregation and stably maintain and transmit [SWI(+)] independently of full-length Swi1. Regions smaller than Swi1(1-32) are either incapable of aggregation or unstably propagate [SWI(+)]. When fused to Sup35MC, the [PSI(+) ] determinant lacking its PrD, Swi1(1-31) and Swi1(1-32) can act as transferable prion domains (PrDs). The resulting fusions give rise to a novel chimeric prion, [SPS(+)], exhibiting [PSI(+)]-like nonsense suppression. Thus, an NH(2)-terminal region of ?30 amino acids of Swi1 contains all the necessary information for in vivo prion formation, maintenance, and transmission. This PrD is unique in size and composition: glutamine free, asparagine rich, and the smallest defined to date. Our findings broaden our understanding of what features allow a protein region to serve as a PrD.
  • |*Gene Expression Regulation, Fungal [MESH]
  • |Acyltransferases/genetics/*metabolism [MESH]
  • |Chromatin Assembly and Disassembly/*physiology [MESH]
  • |Chromosomal Proteins, Non-Histone/metabolism [MESH]
  • |Prion Proteins/*metabolism [MESH]
  • |Prions/chemistry/*metabolism [MESH]
  • |Saccharomyces cerevisiae Proteins/genetics/*metabolism [MESH]
  • |Saccharomyces cerevisiae/*metabolism [MESH]


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