Linking axonal degeneration to microtubule remodeling by Spastin-mediated microtubule severing.
Linking axonal degeneration to microtubule remodeling by Spastin-mediated microtubule severing.
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DOI:
10.1083/jcb.200409058
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发表时间:
2005-02-14
期刊:
影响因子:
--
通讯作者:
Lauring BP
中科院分区:
文献类型:
--
作者:
Evans KJ;Gomes ER;Reisenweber SM;Gundersen GG;Lauring BP
Mutations in the AAA adenosine triphosphatase (ATPase) Spastin (SPG4) cause an autosomal dominant form of hereditary spastic paraplegia, which is a retrograde axonopathy primarily characterized pathologically by the degeneration of long spinal neurons in the corticospinal tracts and the dorsal columns. Using recombinant Spastin, we find that six mutant forms of Spastin, including three disease-associated forms, are severely impaired in ATPase activity. In contrast to a mutation designed to prevent adenosine triphosphate (ATP) binding, an ATP hydrolysis–deficient Spastin mutant predicted to remain kinetically trapped on target proteins decorates microtubules in transfected cells. Analysis of disease-associated missense mutations shows that some more closely resemble the canonical hydrolysis mutant, whereas others resemble the ATP-binding mutant. Using real-time imaging, we show that Spastin severs microtubules when added to permeabilized, cytosol-depleted cells stably expressing GFP-tubulin. Using purified components, we also show that Spastin interacts directly with microtubules and is sufficient for severing. These studies suggest that defects in microtubule severing are a cause of axonal degeneration in human disease.
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影响因子:
4
作者:
Lindsey, JC;Lusher, ME;Bushby, KMD
通讯作者:
Bushby, KMD
影响因子:
56.9
作者:
Hartman, JJ;Vale, RD
通讯作者:
Vale, RD
影响因子:
3.3
作者:
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通讯作者:
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作者:
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通讯作者:
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DOI:
10.1002/neu.10277
发表时间:
2003-12-01
期刊:
JOURNAL OF NEUROBIOLOGY
影响因子:
--
作者:
Nicolaï, M;Lasbleiz, C;Dura, JM
通讯作者:
Dura, JM