Home > Publications database > Molecular basis for diversification of yeast prion strain conformation > print

001     858396
005     20210129235938.0
024 7 _ |a 10.1073/pnas.1715483115
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100 1 _ |a Ohhashi, Yumiko
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245 _ _ |a Molecular basis for diversification of yeast prion strain conformation
260 _ _ |a Washington, DC
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520 _ _ |a Self-propagating β-sheet–rich fibrillar protein aggregates, amyloidfibers, are often associated with cellular dysfunction and disease.Distinct amyloid conformations dictate different physiological consequences,such as cellular toxicity. However, the origin of the diversityof amyloid conformation remains unknown. Here, we suggest thataltered conformational equilibrium in natively disordered monomericproteins leads to the adaptation of alternate amyloid conformationsthat have different phenotypic effects. We performed acomprehensive high-resolution structural analysis of Sup35NM, anN-terminal fragment of the Sup35 yeast prion protein, and foundthat monomeric Sup35NM harbored latent local compact structuresdespite its overall disordered conformation. When the hidden localmicrostructures were relaxed by genetic mutations or solvent conditions,Sup35NM adopted a strikingly different amyloid conformation,which redirected chaperone-mediated fiber fragmentation and modulatedprion strain phenotypes. Thus, dynamic conformational fluctuationsin natively disordered monomeric proteins represent aposttranslational mechanism for diversification of aggregate structuresand cellular phenotypes.
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700 1 _ |a Yamaguchi, Yoshiki
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700 1 _ |a Kurahashi, Hiroshi
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700 1 _ |a Kamatari, Yuji O.
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700 1 _ |a Sugiyama, Shinju
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700 1 _ |a Uluca, Boran
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700 1 _ |a Piechatzek, Timo
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700 1 _ |a Komi, Yusuke
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700 1 _ |a Shida, Toshinobu
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700 1 _ |a Müller, Henrik
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700 1 _ |a Hanashima, Shinya
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700 1 _ |a Heise, Henrike
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700 1 _ |a Kuwata, Kazuo
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700 1 _ |a Tanaka, Motomasa
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773 _ _ |a 10.1073/pnas.1715483115
|g Vol. 115, no. 10, p. 2389 - 2394
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|t Proceedings of the National Academy of Sciences of the United States of America
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|y 2018
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