49 research outputs found

    Structure of mammalian respiratory complex I.

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    Complex I (NADH:ubiquinone oxidoreductase), one of the largest membrane-bound enzymes in the cell, powers ATP synthesis in mammalian mitochondria by using the reducing potential of NADH to drive protons across the inner mitochondrial membrane. Mammalian complex I (ref. 1) contains 45 subunits, comprising 14 core subunits that house the catalytic machinery (and are conserved from bacteria to humans) and a mammalian-specific cohort of 31 supernumerary subunits. Knowledge of the structures and functions of the supernumerary subunits is fragmentary. Here we describe a 4.2-Å resolution single-particle electron cryomicroscopy structure of complex I from Bos taurus. We have located and modelled all 45 subunits, including the 31 supernumerary subunits, to provide the entire structure of the mammalian complex. Computational sorting of the particles identified different structural classes, related by subtle domain movements, which reveal conformationally dynamic regions and match biochemical descriptions of the 'active-to-de-active' enzyme transition that occurs during hypoxia. Our structures therefore provide a foundation for understanding complex I assembly and the effects of mutations that cause clinically relevant complex I dysfunctions, give insights into the structural and functional roles of the supernumerary subunits and reveal new information on the mechanism and regulation of catalysis

    The disruption of proteostasis in neurodegenerative diseases

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    Cells count on surveillance systems to monitor and protect the cellular proteome which, besides being highly heterogeneous, is constantly being challenged by intrinsic and environmental factors. In this context, the proteostasis network (PN) is essential to achieve a stable and functional proteome. Disruption of the PN is associated with aging and can lead to and/or potentiate the occurrence of many neurodegenerative diseases (ND). This not only emphasizes the importance of the PN in health span and aging but also how its modulation can be a potential target for intervention and treatment of human diseases.info:eu-repo/semantics/publishedVersio

    Coping with amplified emotionality among people with bipolar disorder : a longitudinal study

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    201810 bcrcAccepted ManuscriptSelf-fundedPublishe

    Path models of quality of life among people with schizophrenia living in the community in Hong Kong

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    The utilization of quality of life (QOL) in psychiatric community rehabilitation could be enhanced by developing an appropriate conceptual model of QOL. The focus of this study was to construct and test, using path analytic techniques, a pertinent conceptual model of QOL among people with schizophrenia living in the community. A total of 201 participants with schizophrenia living in the community were assessed with regard to their clinical characteristics and QOL. Findings largely supported the proposed model in which community/social functioning was the strongest predictor of QOL, followed by symptom levels. Important implications for the design and implementation of appropriate services in functioning augmentation that resulted in QOL enhancement were highlighted. Further recommendations on both clinical and environmental interventions to promote QOL were suggested. © 2007 Springer Science+Business Media, LLC.link_to_subscribed_fulltex

    Clinical characteristics and objective living conditions in relation to quality of life among community-based individuals of schizophrenia in Hong Kong

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    Quality of life (QOL) has gained importance as an outcome measure for people with schizophrenia living in the community following deinstitutionalization. This study aims at exploring the effects of clinical characteristics and objective living conditions on QOL. In this study, 201 community-based individuals with schizophrenia were recruited from five different types of objective living conditions comprising long stay care home, halfway house, supported hostel/housing, living with family, and living alone. Clinical characteristics including cognitive abilities, symptom levels, and community/social functioning were assessed by the Allen Cognitive Level Screen, the Scales for the Assessment of Negative Symptoms and Positive Symptoms, and the Chinese version of the Multnomah Community Ability Scale respectively. The outcome measure of QOL was measured by the Chinese version of the WHO Quality of Life Measure. Analysis of covariance showed significant differences in community/social functioning, cognitive abilities, and negative symptoms; but not in QOL under different objective living conditions. Further simultaneous multiple regressions found out that community/social functioning was the robust significant predictor of QOL. Yet caution should be noted in making the conclusion with the objective living condition of long stay care home, as it provides a protective element for the perseverance of QOL. © 2006 Springer Science+Business Media B.V.link_to_subscribed_fulltex

    Mind-based and movement-based mind-body intervention for Chinese older people with depression

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    GSA 2019 Annual Scientific Meeting “Strength in Age-Harnessing the Power of Networks”, November 13-17, 2019, Austin, Texas202103 bcrcVersion of RecordPublishe
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