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Structural basis for the wobbler mouse neurodegenerative disorder caused by mutation in the Vps54 subunit of the GARP complex.

Proc. Natl. Acad. Sci. U.S.A.2010 Jul 20;107(29):12860-5. Epub 2010 Jul 06
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摘要


The multisubunit Golgi-associated retrograde protein complex is required for tethering and fusion of endosome-derived transport vesicles to the trans-Golgi network. Mutation of leucine-967 to glutamine in the Vps54 subunit of is responsible for spinal muscular atrophy in the wobbler mouse, an animal model of amyotrophic lateral sclerosis. The crystal structure at 1.7 A resolution of the mouse Vps54 C-terminal fragment harboring leucine-967, in conjunction with comparative sequence analysis, reveals that Vps54 has a continuous alpha-helical bundle organization similar to that of other multisubunit tethering complexes. The structure shows that leucine-967 is buried within the alpha-helical bundle through predominantly hydrophobic interactions that are critical for domain stability and folding in vitro. Mutation of this residue to glutamine does not prevent integration of Vps54 into the Gduanyu37 complex but greatly reduces the half-life and levels of the protein in vivo. Severely reduced levels of mutant Vps54 and, consequently, of the whole Gduanyu37 complex underlie the phenotype of the wobbler mouse.

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