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https://www.readbyqxmd.com/read/28864540/vps13-mcp1-interact-at-vacuole-mitochondria-interfaces-and-bypass-er-mitochondria-contact-sites
#1
Arun T John Peter, Beatrice Herrmann, Diana Antunes, Doron Rapaport, Kai Stefan Dimmer, Benoît Kornmann
Membrane contact sites between endoplasmic reticulum (ER) and mitochondria, mediated by the ER-mitochondria encounter structure (ERMES) complex, are critical for mitochondrial homeostasis and cell growth. Defects in ERMES can, however, be bypassed by point mutations in the endosomal protein Vps13 or by overexpression of the mitochondrial protein Mcp1. How this bypass operates remains unclear. Here we show that the mitochondrial outer membrane protein Mcp1 functions in the same pathway as Vps13 by recruiting it to mitochondria and promoting its association to vacuole-mitochondria contacts...
September 1, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28846184/yeast-and-other-lower-eukaryotic-organisms-for-studies-of-vps13-proteins-in-health-and-disease
#2
REVIEW
Weronika Rzepnikowska, Krzysztof Flis, Sandra Muñoz-Braceras, Regina Menezes, Ricardo Escalante, Teresa Zoladek
Human Vps13 proteins are associated with several diseases, including the neurodegenerative disorder Chorea-acanthocytosis (ChAc), yet the biology of these proteins is still poorly understood. Studies in Saccharomyces cerevisiae, Dictyostelium discoideum, Tetrahymena thermophila and Drosophila melanogaster point to the involvement of Vps13 in cytoskeleton organization, vesicular trafficking, autophagy, phagocytosis, endocytosis, proteostasis, sporulation and mitochondrial functioning. Recent findings show that yeast Vps13 binds to phosphatidylinositol lipids via four different regions and functions at membrane contact sites, enlarging the list of Vps13 functions...
August 28, 2017: Traffic
https://www.readbyqxmd.com/read/28637866/endoplasmic-reticulum-mitochondria-junction-is-required-for-iron-homeostasis
#3
Yong Xue, Stefan Schmollinger, Narsis Attar, Oscar A Campos, Maria Vogelauer, Michael F Carey, Sabeeha S Merchant, Siavash K Kurdistani
The endoplasmic reticulum (ER)-mitochondria encounter structure (ERMES) is a protein complex that physically tethers the two organelles to each other and creates the physical basis for communication between them. ERMES functions in lipid exchange between the ER and mitochondria, protein import into mitochondria, and maintenance of mitochondrial morphology and genome. Here, we report that ERMES is also required for iron homeostasis. Loss of ERMES components activates an Aft1-dependent iron deficiency response even in iron-replete conditions, leading to accumulation of excess iron inside the cell...
August 11, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28421052/whole-genome-based-amplified-fragment-length-polymorphism-analysis-reveals-genetic-diversity-in-candida-africana
#4
Anuradha Chowdhary, Ferry Hagen, Cheshta Sharma, Abdullah M S Al-Hatmi, Letterio Giuffrè, Domenico Giosa, Shangrong Fan, Hamid Badali, Maria Rosa Felice, Sybren de Hoog, Jacques F Meis, Orazio Romeo
This study aimed at investigating the genetic diversity of a panel of Candida africana strains recovered from vaginal samples in different countries. All fungal strains were heterozygous at the mating-type-like locus and belonged to the genotype A of Candida albicans. Moreover, all examined C. africana strains lack N-acetylglucosamine assimilation and sequence analysis of the HXK1 gene showed a distinctive polymorphism that impair the utilization of this amino sugar in this yeast. Multi-locus sequencing of seven housekeeping genes revealed a substantial genetic homogeneity among the strains, except for the CaMPIb, SYA1 and VPS13 loci which contributed significantly to the classification of our set of C...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28404745/quantitative-high-content-imaging-identifies-novel-regulators-of-neo1-trafficking-at-endosomes
#5
Lauren E Dalton, Björn D M Bean, Michael Davey, Elizabeth Conibear
P4-ATPases are a family of putative phospholipid flippases that regulate lipid membrane asymmetry, which is important for vesicle formation. Two yeast flippases, Drs2 and Neo1, have nonredundant functions in the recycling of the synaptobrevin-like v-SNARE Snc1 from early endosomes. Drs2 activity is needed to form vesicles and regulate its own trafficking, suggesting that flippase activity and localization are linked. However, the role of Neo1 in endosomal recycling is not well characterized. To identify novel regulators of Neo1 trafficking and activity at endosomes, we first identified mutants with impaired recycling of a Snc1-based reporter and subsequently used high-content microscopy to classify these mutants based on the localization of Neo1 or its binding partners, Mon2 and Dop1...
June 1, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28334785/amino-acid-substitution-equivalent-to-human-chorea-acanthocytosis-i2771r-in-yeast-vps13-protein-affects-its-binding-to-phosphatidylinositol-3-phosphate
#6
Weronika Rzepnikowska, Krzysztof Flis, Joanna Kaminska, Marcin Grynberg, Agnieszka Urbanek, Kathryn R Ayscough, Teresa Zoladek
The rare human disorder chorea-acanthocytosis (ChAc) is caused by mutations in hVPS13A gene. The hVps13A protein interacts with actin and regulates the level of phosphatidylinositol 4-phosphate (PI4P) in the membranes of neuronal cells. Yeast Vps13 is involved in vacuolar protein transport and, like hVps13A, participates in PI4P metabolism. Vps13 proteins are conserved in eukaryotes, but their molecular function remains unknown. One of the mutations found in ChAc patients causes amino acids substitution I2771R which affects the localization of hVps13A in skeletal muscles...
April 15, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28122956/vps13-and-cdc31-centrin-puzzling-partners-in-membrane-traffic
#7
Margaret D Myers, Gregory S Payne
Yeast Vps13 is a member of a conserved protein family that includes human homologues associated with neurodegenerative and developmental disorders. In this issue, De et al. (2017. J. Cell Biol. https://doi.org/10.1083/jcb.201606078) establish direct roles for Vps13 and its surprising binding partner, the calcium-binding centrin Cdc31, in trans-Golgi network (TGN) to endosome traffic and TGN homotypic fusion.
February 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28122955/the-vps13p-cdc31p-complex-is-directly-required-for-tgn-late-endosome-transport-and-tgn-homotypic-fusion
#8
Mithu De, Austin N Oleskie, Mariam Ayyash, Somnath Dutta, Liliya Mancour, Mohamed E Abazeed, Eddy J Brace, Georgios Skiniotis, Robert S Fuller
Yeast VPS13 is the founding member of a eukaryotic gene family of growing interest in cell biology and medicine. Mutations in three of four human VPS13 genes cause autosomal recessive neurodegenerative or neurodevelopmental disease, making yeast Vps13p an important structural and functional model. Using cell-free reconstitution with purified Vps13p, we show that Vps13p is directly required both for transport from the trans-Golgi network (TGN) to the late endosome/prevacuolar compartment (PVC) and for TGN homotypic fusion...
February 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28107480/drosophila-vps13-is-required-for-protein-homeostasis-in-the-brain
#9
Jan J Vonk, Wondwossen M Yeshaw, Francesco Pinto, Anita I E Faber, Liza L Lahaye, Bart Kanon, Marianne van der Zwaag, Antonio Velayos-Baeza, Raimundo Freire, Sven C van IJzendoorn, Nicola A Grzeschik, Ody C M Sibon
Chorea-Acanthocytosis is a rare, neurodegenerative disorder characterized by progressive loss of locomotor and cognitive function. It is caused by loss of function mutations in the Vacuolar Protein Sorting 13A (VPS13A) gene, which is conserved from yeast to human. The consequences of VPS13A dysfunction in the nervous system are still largely unspecified. In order to study the consequences of VPS13A protein dysfunction in the ageing central nervous system we characterized a Drosophila melanogaster Vps13 mutant line...
2017: PloS One
https://www.readbyqxmd.com/read/27303688/the-dysferlin-domain-only-protein-spo73-is-required-for-prospore-membrane-extension-in-saccharomyces-cerevisiae
#10
Yuuya Okumura, Tsuyoshi S Nakamura, Takayuki Tanaka, Ichiro Inoue, Yasuyuki Suda, Tetsuo Takahashi, Hideki Nakanishi, Shugo Nakamura, Xiao-Dong Gao, Hiroyuki Tachikawa
Sporulation of Saccharomyces cerevisiae is a developmental process in which an ascus containing four haploid spores forms from a diploid cell. During this process, newly formed membrane structures called prospore membranes extend along the nuclear envelope and engulf and package daughter nuclei along with cytosol and organelles to form precursors of spores. Proteins involved in prospore membrane extension, Vps13 and Spo71, have recently been reported; however, the overall mechanism of membrane extension remains unclear...
January 2016: MSphere
https://www.readbyqxmd.com/read/27280386/yeast-vps13-promotes-mitochondrial-function-and-is-localized-at-membrane-contact-sites
#11
Jae-Sook Park, Mary K Thorsness, Robert Policastro, Luke L McGoldrick, Nancy M Hollingsworth, Peter E Thorsness, Aaron M Neiman
The Vps13 protein family is highly conserved in eukaryotic cells. Mutations in human VPS13 genes result in a variety of diseases, such as chorea acanthocytosis (ChAc), but the cellular functions of Vps13 proteins are not well defined. In yeast, there is a single VPS13 orthologue, which is required for at least two different processes: protein sorting to the vacuole and sporulation. This study demonstrates that VPS13 is also important for mitochondrial integrity. In addition to preventing transfer of DNA from the mitochondrion to the nucleus, VPS13 suppresses mitophagy and functions in parallel with the endoplasmic reticulum-mitochondrion encounter structure (ERMES)...
August 1, 2016: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/27073999/identification-of-vps13c-as-a-galectin-12-binding-protein-that-regulates-galectin-12-protein-stability-and-adipogenesis
#12
Ri-Yao Yang, Huiting Xue, Lan Yu, Antonio Velayos-Baeza, Anthony P Monaco, Fu-Tong Liu
Galectin-12, a member of the galectin family of β-galactoside-binding animal lectins, is preferentially expressed in adipocytes and required for adipocyte differentiation in vitro. This protein was recently found to regulate lipolysis, whole body adiposity, and glucose homeostasis in vivo. Here we identify VPS13C, a member of the VPS13 family of vacuolar protein sorting-associated proteins highly conserved throughout eukaryotic evolution, as a major galectin-12-binding protein. VPS13C is upregulated during adipocyte differentiation, and is required for galectin-12 protein stability...
2016: PloS One
https://www.readbyqxmd.com/read/26605945/spo73-and-spo71-function-cooperatively-in-prospore-membrane-elongation-during-sporulation-in-saccharomyces-cerevisiae
#13
Emily M Parodi, Joseph M Roesner, Linda S Huang
In the yeast Saccharomyces cerevisiae, cells undergoing sporulation form prospore membranes to surround their meiotic nuclei. The prospore membranes ultimately become the plasma membranes of the new cells. The putative phospholipase Spo1 and the tandem Pleckstrin Homology domain protein Spo71 have previously been shown to be required for prospore membrane development, along with the constitutively expressed Vps13 involved in vacuolar sorting. Here, we utilize genetic analysis, and find that SPO73 is required for proper prospore membrane shape and, like SPO71, is necessary for prospore membrane elongation...
2015: PloS One
https://www.readbyqxmd.com/read/26370498/er-mitochondrial-junctions-can-be-bypassed-by-dominant-mutations-in-the-endosomal-protein-vps13
#14
Alexander B Lang, Arun T John Peter, Peter Walter, Benoît Kornmann
The endoplasmic reticulum-mitochondria encounter structure (ERMES) complex tethers the endoplasmic reticulum and the mitochondria. It is thought to facilitate interorganelle lipid exchange and influence mitochondrial dynamics and mitochondrial DNA maintenance. Despite this important role, ERMES is not found in metazoans. Here, we identified single amino acid substitutions in Vps13 (vacuolar protein sorting 13), a large universally conserved eukaryotic protein, which suppress all measured phenotypic consequences of ERMES deficiency...
September 14, 2015: Journal of Cell Biology
https://www.readbyqxmd.com/read/25996471/tipc-and-the-chorea-acanthocytosis-protein-vps13a-regulate-autophagy-in-dictyostelium-and-human-hela-cells
#15
Sandra Muñoz-Braceras, Rosa Calvo, Ricardo Escalante
Deficient autophagy causes a distinct phenotype in Dictyostelium discoideum, characterized by the formation of multitips at the mound stage. This led us to analyze autophagy in a number of multitipped mutants described previously (tipA(-), tipB(-), tipC(-), and tipD(-)). We found a clear autophagic dysfunction in tipC(-) and tipD(-) while the others showed no defects. tipD codes for a homolog of Atg16, which confirms the role of this protein in Dictyostelium autophagy and validates our approach. The tipC-encoded protein is highly similar to human VPS13A (also known as chorein), whose mutations cause the chorea-acanthocytosis syndrome...
2015: Autophagy
https://www.readbyqxmd.com/read/25915401/a-conserved-function-in-phosphatidylinositol-metabolism-for-mammalian-vps13-family-proteins
#16
Jae-Sook Park, Simon Halegoua, Shosei Kishida, Aaron M Neiman
The Vps13 protein family is highly conserved in eukaryotic cells. In humans, mutations in the gene encoding the family member VPS13A lead to the neurodegenerative disorder chorea-acanthocytosis. In the yeast Saccharomyces cerevisiae, there is just a single version of VPS13, thereby simplifying the task of unraveling its molecular function(s). While VPS13 was originally identified in yeast by its role in vacuolar sorting, recent studies have revealed a completely different function for VPS13 in sporulation, where VPS13 regulates phosphatidylinositol-4-phosphate (PtdIns(4)P) levels in the prospore membrane...
2015: PloS One
https://www.readbyqxmd.com/read/25486452/the-vacuolar-protein-sorting-genes-in-insects-a-comparative-genome-view
#17
Zhaofei Li, Gary Blissard
In eukaryotic cells, regulated vesicular trafficking is critical for directing protein transport and for recycling and degradation of membrane lipids and proteins. Through carefully regulated transport vesicles, the endomembrane system performs a large and important array of dynamic cellular functions while maintaining the integrity of the cellular membrane system. Genetic studies in yeast Saccharomyces cerevisiae have identified approximately 50 vacuolar protein sorting (VPS) genes involved in vesicle trafficking, and most of these genes are also characterized in mammals...
July 2015: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/24901719/sequences-type-analysis-of-candida-albicans-isolates-from-iranian-human-immunodeficiency-virus-infected-patients-with-oral-candidiasis
#18
Farzad Katiraee, Vahid Khalaj, Ali Reza Khosravi, Mahboubeh Hajiabdolbaghi
The growing number of immunocompromised individuals has increased the incidence of infections caused by Candida species during the recent decades. Typing of C. albicans on the basis of DNA sequences at multiple loci has greatly advanced our knowledge about the epidemiology and phylogeny of candidiasis. The aim of this study was to evaluate the diversity, and genetic relationships among C. albicans isolates obtained from HIV patients in Iran. using multilocus sequence typing (MLST) method. We analyzed 25 C. albicans isolates obtained from HIV positive patients referred to Iranian Research Center for HIV/AIDS...
2014: Acta Medica Iranica
https://www.readbyqxmd.com/read/24036347/spo71-encodes-a-developmental-stage-specific-partner-for-vps13-in-saccharomyces-cerevisiae
#19
Jae-Sook Park, Yuuya Okumura, Hiroyuki Tachikawa, Aaron M Neiman
The creation of haploid gametes in yeast, termed spores, requires the de novo formation of membranes within the cytoplasm. These membranes, called prospore membranes, enclose the daughter nuclei generated by meiosis. Proper growth and closure of prospore membranes require the highly conserved Vps13 protein. Mutation of SPO71, a meiosis-specific gene first identified as defective in spore formation, was found to display defects in membrane morphogenesis very similar to those seen in vps13Δ cells. Specifically, prospore membranes are smaller than in the wild type, they fail to close, and membrane vesicles are present within the prospore membrane lumen...
November 2013: Eukaryotic Cell
https://www.readbyqxmd.com/read/22777538/globus-pallidus-interna-deep-brain-stimulation-improves-chorea-and-functional-status-in-a-patient-with-chorea-acanthocytosis
#20
Hyeeun Shin, Chang-Seok Ki, Ah Ra Cho, Jung-Il Lee, Jin Young Ahn, Jae-Hyeok Lee, Jin Whan Cho
We report a 39-year-old woman with chorea-acanthocytosis (ChAc) who was referred with refractory hyperkinetic movement and truncal bending spasm. She was diagnosed with ChAc with clinical features and laboratory findings of acanthocytosis in peripheral blood smear, and genetic studies revealed novel mutations in the VPS13 gene. Because her symptoms did not respond well to medical treatment, she was in a totally dependent state. We decided to perform globus pallidus interna deep brain stimulation (GPi-DBS) for symptom control...
2012: Stereotactic and Functional Neurosurgery
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