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Fote GM, Eapen VV, Lim RG, Yu C, Salazar L, McClure NR, McKnight J, Nguyen TB, Heath MC, Lau AL, Villamil MA, Miramontes R, Kratter IH, Finkbeiner S, Reidling JC, Paulo JA, Kaiser P, Huang L, Housman DE, Thompson LM, Steffan JS. Huntingtin contains an ubiquitin-binding domain and regulates lysosomal targeting of mitochondrial and RNA-binding proteins. Proc Natl Acad Sci U S A 2024; 121:e2319091121. [PMID: 39074279 PMCID: PMC11317567 DOI: 10.1073/pnas.2319091121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 06/20/2024] [Indexed: 07/31/2024] Open
Abstract
Understanding the normal function of the Huntingtin (HTT) protein is of significance in the design and implementation of therapeutic strategies for Huntington's disease (HD). Expansion of the CAG repeat in the HTT gene, encoding an expanded polyglutamine (polyQ) repeat within the HTT protein, causes HD and may compromise HTT's normal activity contributing to HD pathology. Here, we investigated the previously defined role of HTT in autophagy specifically through studying HTT's association with ubiquitin. We find that HTT interacts directly with ubiquitin in vitro. Tandem affinity purification was used to identify ubiquitinated and ubiquitin-associated proteins that copurify with a HTT N-terminal fragment under basal conditions. Copurification is enhanced by HTT polyQ expansion and reduced by mimicking HTT serine 421 phosphorylation. The identified HTT-interacting proteins include RNA-binding proteins (RBPs) involved in mRNA translation, proteins enriched in stress granules, the nuclear proteome, the defective ribosomal products (DRiPs) proteome and the brain-derived autophagosomal proteome. To determine whether the proteins interacting with HTT are autophagic targets, HTT knockout (KO) cells and immunoprecipitation of lysosomes were used to investigate autophagy in the absence of HTT. HTT KO was associated with reduced abundance of mitochondrial proteins in the lysosome, indicating a potential compromise in basal mitophagy, and increased lysosomal abundance of RBPs which may result from compensatory up-regulation of starvation-induced macroautophagy. We suggest HTT is critical for appropriate basal clearance of mitochondrial proteins and RBPs, hence reduced HTT proteostatic function with mutation may contribute to the neuropathology of HD.
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Affiliation(s)
- Gianna M. Fote
- Department of Biological Chemistry, UC Irvine School of Medicine, Irvine, CA92697
- Department of Neurological Surgery, UC Irvine School of Medicine, Orange, CA92868
| | - Vinay V. Eapen
- Department of Cell Biology, Harvard Medical School, Boston, MA02115
- Casma Therapeutics, Cambridge, MA02139
| | - Ryan G. Lim
- The University of California Irvine Institute for Memory Impairments and Neurological Disorders, University of California, Irvine, CA92697
| | - Clinton Yu
- Department of Physiology and Biophysics, University of California, Irvine, CA92697
| | - Lisa Salazar
- Department of Psychiatry and Human Behavior, UC Irvine School of Medicine, Orange, CA92868
| | - Nicolette R. McClure
- Department of Neurobiology and Behavior, University of California, Irvine, CA92697
| | - Jharrayne McKnight
- Department of Neurobiology and Behavior, University of California, Irvine, CA92697
| | - Thai B. Nguyen
- Department of Neurobiology and Behavior, University of California, Irvine, CA92697
| | - Marie C. Heath
- Department of Neurobiology and Behavior, University of California, Irvine, CA92697
| | - Alice L. Lau
- Department of Psychiatry and Human Behavior, UC Irvine School of Medicine, Orange, CA92868
| | - Mark A. Villamil
- Department of Biological Chemistry, UC Irvine School of Medicine, Irvine, CA92697
| | - Ricardo Miramontes
- Department of Psychiatry and Human Behavior, UC Irvine School of Medicine, Orange, CA92868
| | - Ian H. Kratter
- Center for Systems and Therapeutics, Gladstone Institutes, San Francisco, CA94158
- Stanford Brain Stimulation Lab, Stanford, CA94304
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA94304
| | - Steven Finkbeiner
- Center for Systems and Therapeutics, Gladstone Institutes, San Francisco, CA94158
- Department of Physiology, University of California, San Francisco, CA94158
- Department of Neurology, University of California, San Francisco, CA94158
| | - Jack C. Reidling
- The University of California Irvine Institute for Memory Impairments and Neurological Disorders, University of California, Irvine, CA92697
| | - Joao A. Paulo
- Department of Cell Biology, Harvard Medical School, Boston, MA02115
| | - Peter Kaiser
- Department of Biological Chemistry, UC Irvine School of Medicine, Irvine, CA92697
| | - Lan Huang
- Department of Physiology and Biophysics, University of California, Irvine, CA92697
| | - David E. Housman
- Koch Institute for Integrative Cancer Research, The Massachusetts Institute of Technology, Cambridge, MA02139
| | - Leslie M. Thompson
- Department of Biological Chemistry, UC Irvine School of Medicine, Irvine, CA92697
- The University of California Irvine Institute for Memory Impairments and Neurological Disorders, University of California, Irvine, CA92697
- Department of Psychiatry and Human Behavior, UC Irvine School of Medicine, Orange, CA92868
- Department of Neurobiology and Behavior, University of California, Irvine, CA92697
- Center for Epigenetics and Metabolism, University of California, Irvine School of Medicine, University of California, Irvine, CA92697
| | - Joan S. Steffan
- The University of California Irvine Institute for Memory Impairments and Neurological Disorders, University of California, Irvine, CA92697
- Department of Psychiatry and Human Behavior, UC Irvine School of Medicine, Orange, CA92868
- Center for Epigenetics and Metabolism, University of California, Irvine School of Medicine, University of California, Irvine, CA92697
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Feole M, Pozo Devoto VM, Dragišić N, Arnaiz C, Bianchelli J, Texlová K, Kovačovicova K, Novotny JS, Havas D, Falzone TL, Stokin GB. Swedish Alzheimer's disease variant perturbs activity of retrograde molecular motors and causes widespread derangement of axonal transport pathways. J Biol Chem 2024; 300:107137. [PMID: 38447793 PMCID: PMC10997842 DOI: 10.1016/j.jbc.2024.107137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 02/14/2024] [Accepted: 02/16/2024] [Indexed: 03/08/2024] Open
Abstract
Experimental studies in flies, mice, and humans suggest a significant role of impaired axonal transport in the pathogenesis of Alzheimer's disease (AD). The mechanisms underlying these impairments in axonal transport, however, remain poorly understood. Here we report that the Swedish familial AD mutation causes a standstill of the amyloid precursor protein (APP) in the axons at the expense of its reduced anterograde transport. The standstill reflects the perturbed directionality of the axonal transport of APP, which spends significantly more time traveling in the retrograde direction. This ineffective movement is accompanied by an enhanced association of dynactin-1 with APP, which suggests that reduced anterograde transport of APP is the result of enhanced activation of the retrograde molecular motor dynein by dynactin-1. The impact of the Swedish mutation on axonal transport is not limited to the APP vesicles since it also reverses the directionality of a subset of early endosomes, which become enlarged and aberrantly accumulate in distal locations. In addition, it also reduces the trafficking of lysosomes due to their less effective retrograde movement. Altogether, our experiments suggest a pivotal involvement of retrograde molecular motors and transport in the mechanisms underlying impaired axonal transport in AD and reveal significantly more widespread derangement of axonal transport pathways in the pathogenesis of AD.
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Affiliation(s)
- Monica Feole
- Translational Ageing and Neuroscience Program, Centre for Translational Medicine, International Clinical Research Centre, St Anne's University Hospital, Brno, Czech Republic; Faculty of Medicine, Department of Biology, Masaryk University, Brno, Czech Republic; School of Cardiovascular and Metabolic Medicine & Sciences, King's College London, London, UK
| | - Victorio M Pozo Devoto
- Translational Ageing and Neuroscience Program, Centre for Translational Medicine, International Clinical Research Centre, St Anne's University Hospital, Brno, Czech Republic
| | - Neda Dragišić
- Translational Ageing and Neuroscience Program, Centre for Translational Medicine, International Clinical Research Centre, St Anne's University Hospital, Brno, Czech Republic
| | - Cayetana Arnaiz
- Instituto de Investigación en Biomedicina de Buenos Aires (IBioBA-CONICET-MPSP), Partner Institute of the Max Planck Society, Buenos Aires, Argentina
| | - Julieta Bianchelli
- Instituto de Investigación en Biomedicina de Buenos Aires (IBioBA-CONICET-MPSP), Partner Institute of the Max Planck Society, Buenos Aires, Argentina
| | - Kateřina Texlová
- Translational Ageing and Neuroscience Program, Centre for Translational Medicine, International Clinical Research Centre, St Anne's University Hospital, Brno, Czech Republic; PsychoGenics, Paramus, New Jersey, USA
| | | | - Jan S Novotny
- Translational Ageing and Neuroscience Program, Centre for Translational Medicine, International Clinical Research Centre, St Anne's University Hospital, Brno, Czech Republic; Institute for Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacký University Olomouc, Olomouc, Czech Republic
| | | | - Tomas L Falzone
- Instituto de Investigación en Biomedicina de Buenos Aires (IBioBA-CONICET-MPSP), Partner Institute of the Max Planck Society, Buenos Aires, Argentina; Instituto de Biología Celular y Neurociencia IBCN (UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Gorazd B Stokin
- Translational Ageing and Neuroscience Program, Centre for Translational Medicine, International Clinical Research Centre, St Anne's University Hospital, Brno, Czech Republic; Institute for Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacký University Olomouc, Olomouc, Czech Republic; Division of Neurology, University Medical Centre, Ljubljana, Slovenia; Department of Neurosciences, Mayo Clinic, Rochester, Minnesota, USA.
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Sabharwal V, Boyanapalli SPP, Shee A, Nonet ML, Nandi A, Chaudhuri D, Koushika SP. F-box protein FBXB-65 regulates anterograde transport of the kinesin-3 motor UNC-104 through a PTM near its cargo-binding PH domain. J Cell Sci 2024; 137:jcs261553. [PMID: 38477340 PMCID: PMC11058344 DOI: 10.1242/jcs.261553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 03/06/2024] [Indexed: 03/14/2024] Open
Abstract
Axonal transport in neurons is essential for cargo movement between the cell body and synapses. Caenorhabditis elegans UNC-104 and its homolog KIF1A are kinesin-3 motors that anterogradely transport precursors of synaptic vesicles (pre-SVs) and are degraded at synapses. However, in C. elegans, touch neuron-specific knockdown of the E1 ubiquitin-activating enzyme, uba-1, leads to UNC-104 accumulation at neuronal ends and synapses. Here, we performed an RNAi screen and identified that depletion of fbxb-65, which encodes an F-box protein, leads to UNC-104 accumulation at neuronal distal ends, and alters UNC-104 net anterograde movement and levels of UNC-104 on cargo without changing synaptic UNC-104 levels. Split fluorescence reconstitution showed that UNC-104 and FBXB-65 interact throughout the neuron. Our theoretical model suggests that UNC-104 might exhibit cooperative cargo binding that is regulated by FBXB-65. FBXB-65 regulates an unidentified post-translational modification (PTM) of UNC-104 in a region beside the cargo-binding PH domain. Both fbxb-65 and UNC-104, independently of FBXB-65, regulate axonal pre-SV distribution, transport of pre-SVs at branch points and organismal lifespan. FBXB-65 regulates a PTM of UNC-104 and the number of motors on the cargo surface, which can fine-tune cargo transport to the synapse.
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Affiliation(s)
- Vidur Sabharwal
- Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai 400005, India
| | | | - Amir Shee
- Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
- Northwestern Institute on Complex Systems and ESAM, Northwestern University, Evanston, IL 60208, USA
| | - Michael L Nonet
- Department of Neuroscience, Washington University School of Medicine, St Louis, MO 63110, USA
| | - Amitabha Nandi
- Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Debasish Chaudhuri
- Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Sandhya P Koushika
- Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai 400005, India
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Makeeva VS, Dyrkheeva NS, Lavrik OI, Zakian SM, Malakhova AA. Mutant-Huntingtin Molecular Pathways Elucidate New Targets for Drug Repurposing. Int J Mol Sci 2023; 24:16798. [PMID: 38069121 PMCID: PMC10706709 DOI: 10.3390/ijms242316798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 11/18/2023] [Accepted: 11/24/2023] [Indexed: 12/18/2023] Open
Abstract
The spectrum of neurodegenerative diseases known today is quite extensive. The complexities of their research and treatment lie not only in their diversity. Even many years of struggle and narrowly focused research on common pathologies such as Alzheimer's, Parkinson's, and other brain diseases have not brought cures for these illnesses. What can be said about orphan diseases? In particular, Huntington's disease (HD), despite affecting a smaller part of the human population, still attracts many researchers. This disorder is known to result from a mutation in the HTT gene, but having this information still does not simplify the task of drug development and studying the mechanisms of disease progression. Nonetheless, the data accumulated over the years and their analysis provide a good basis for further research. Here, we review studies devoted to understanding the mechanisms of HD. We analyze genes and molecular pathways involved in HD pathogenesis to describe the action of repurposed drugs and try to find new therapeutic targets.
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Affiliation(s)
- Vladlena S. Makeeva
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 10 Akad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (V.S.M.); (S.M.Z.); (A.A.M.)
| | - Nadezhda S. Dyrkheeva
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of Russian Academy of Sciences, 8 Akad. Lavrentiev Ave., 630090 Novosibirsk, Russia;
| | - Olga I. Lavrik
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of Russian Academy of Sciences, 8 Akad. Lavrentiev Ave., 630090 Novosibirsk, Russia;
| | - Suren M. Zakian
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 10 Akad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (V.S.M.); (S.M.Z.); (A.A.M.)
| | - Anastasia A. Malakhova
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, 10 Akad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (V.S.M.); (S.M.Z.); (A.A.M.)
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