Journal
NATURE STRUCTURAL & MOLECULAR BIOLOGY
Volume 22, Issue 12, Pages 1008-1015Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb.3127
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Funding
- Australian Research Council [DP120102763, FT120100039, FT100100411, FT100100560]
- Australian National Health and Medical Research Council [APP1049458, 628946, 465401, APP1049459]
- Australian Research Council [FT120100039, FT100100411, FT100100560] Funding Source: Australian Research Council
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Polyglutamine (polyGln) expansions in nine human proteins result in neurological diseases and induce the proteins' tendency to form beta-rich amyloid fibrils and intracellular deposits. Less well known are at least nine other human diseases caused by polyalanine (polyAla)-expansion mutations in different proteins. The mechanisms of how polyAla aggregates under physiological conditions remain unclear and controversial. We show here that aggregation of polyAla is mechanistically dissimilar to that of polyGln and hence does not exhibit amyloid kinetics. Poly Ala assembled spontaneously into a-helical clusters with diverse oligomeric states. Such clustering was pervasive in cells irrespective of visible aggregate formation, and it disrupted the normal physiological oligomeric state of two human proteins natively containing polyAla: ARX and SOX3. This self-assembly pattern indicates that polyAla expansions chronically disrupt protein behavior by imposing a deranged oligomeric status.
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