Aberrant molecular properties shared by familial Parkinson's disease-associated mutant UCH-L1 and carbonyl-modified UCH-L1

Tomohiro Kabuta, Rieko Setsuie, Takeshi Mitsui, Aiko Kinugawa, Mikako Sakurai, Shunsuke Aoki, Kenko Uchida, Keiji Wada

    Research output: Contribution to journalArticle

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    Abstract

    Parkinson's disease (PD) is a neurodegenerative disorder characterized by loss of dopaminergic neurons. The I93M mutation in ubiquitin C-terminal hydrolase L1 (UCH-L1) is associated with familial PD, and we have previously shown that the I93M UCH-L1-transgenic mice exhibit dopaminergic cell loss. Over 90% of neurodegenerative diseases, including PD, occur sporadically. However, the molecular mechanisms underlying sporadic PD as well as PD associated with I93M UCH-L1 are largely unknown. UCH-L1 is abundant (1-5% of total soluble protein) in the brain and is a major target of oxidative/carbonyl damage associated with sporadic PD. As well, abnormal microtubule dynamics and tubulin polymerization are associated with several neurodegenerative diseases including frontotemporal dementia and parkinsonism linked to chromosome 17. Here we show that familial PD-associated mutant UCH-L1 and carbonyl-modified UCH-L1 display shared aberrant properties: compared with wild-type UCH-L1, they exhibit increased insolubility and elevated interactions with multiple proteins, which are characteristics of several neurodegenerative diseases-linked mutants. Circular dichroism analyses suggest similar structural changes in both UCH-L1 variants. We further report that one of the proteins interacting with UCH-L1 is tubulin, and that aberrant interaction of mutant or carbonyl-modified UCH-L1 with tubulin modulates tubulin polymerization. These findings may underlie the toxic gain of function by mutant UCH-L1 in familial PD. Our results also suggest that the carbonyl modification of UCH-L1 and subsequent abnormal interactions of carbonyl-modified UCH-L1 with multiple proteins, including tubulin, constitute one of the causes of sporadic PD.

    Original languageEnglish
    Pages (from-to)1482-1496
    Number of pages15
    JournalHuman Molecular Genetics
    Volume17
    Issue number10
    DOIs
    Publication statusPublished - 2008 May 15

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    Ubiquitin Thiolesterase
    Parkinson Disease
    Tubulin
    Neurodegenerative Diseases
    Polymerization
    Proteins
    Frontotemporal Dementia
    Chromosomes, Human, Pair 17
    Poisons
    Dopaminergic Neurons
    Parkinsonian Disorders

    ASJC Scopus subject areas

    • Genetics

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    Aberrant molecular properties shared by familial Parkinson's disease-associated mutant UCH-L1 and carbonyl-modified UCH-L1. / Kabuta, Tomohiro; Setsuie, Rieko; Mitsui, Takeshi; Kinugawa, Aiko; Sakurai, Mikako; Aoki, Shunsuke; Uchida, Kenko; Wada, Keiji.

    In: Human Molecular Genetics, Vol. 17, No. 10, 15.05.2008, p. 1482-1496.

    Research output: Contribution to journalArticle

    Kabuta, Tomohiro ; Setsuie, Rieko ; Mitsui, Takeshi ; Kinugawa, Aiko ; Sakurai, Mikako ; Aoki, Shunsuke ; Uchida, Kenko ; Wada, Keiji. / Aberrant molecular properties shared by familial Parkinson's disease-associated mutant UCH-L1 and carbonyl-modified UCH-L1. In: Human Molecular Genetics. 2008 ; Vol. 17, No. 10. pp. 1482-1496.
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    abstract = "Parkinson's disease (PD) is a neurodegenerative disorder characterized by loss of dopaminergic neurons. The I93M mutation in ubiquitin C-terminal hydrolase L1 (UCH-L1) is associated with familial PD, and we have previously shown that the I93M UCH-L1-transgenic mice exhibit dopaminergic cell loss. Over 90{\%} of neurodegenerative diseases, including PD, occur sporadically. However, the molecular mechanisms underlying sporadic PD as well as PD associated with I93M UCH-L1 are largely unknown. UCH-L1 is abundant (1-5{\%} of total soluble protein) in the brain and is a major target of oxidative/carbonyl damage associated with sporadic PD. As well, abnormal microtubule dynamics and tubulin polymerization are associated with several neurodegenerative diseases including frontotemporal dementia and parkinsonism linked to chromosome 17. Here we show that familial PD-associated mutant UCH-L1 and carbonyl-modified UCH-L1 display shared aberrant properties: compared with wild-type UCH-L1, they exhibit increased insolubility and elevated interactions with multiple proteins, which are characteristics of several neurodegenerative diseases-linked mutants. Circular dichroism analyses suggest similar structural changes in both UCH-L1 variants. We further report that one of the proteins interacting with UCH-L1 is tubulin, and that aberrant interaction of mutant or carbonyl-modified UCH-L1 with tubulin modulates tubulin polymerization. These findings may underlie the toxic gain of function by mutant UCH-L1 in familial PD. Our results also suggest that the carbonyl modification of UCH-L1 and subsequent abnormal interactions of carbonyl-modified UCH-L1 with multiple proteins, including tubulin, constitute one of the causes of sporadic PD.",
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    AU - Kinugawa, Aiko

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