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Wang S, Fairall L, Pham TK, Ragan TJ, Vashi D, Collins M, Dominguez C, Schwabe JR. A potential histone-chaperone activity for the MIER1 histone deacetylase complex. Nucleic Acids Res 2023; 51:6006-6019. [PMID: 37099381 PMCID: PMC10325919 DOI: 10.1093/nar/gkad294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 03/10/2023] [Accepted: 04/19/2023] [Indexed: 04/27/2023] Open
Abstract
Histone deacetylases 1 and 2 (HDAC1/2) serve as the catalytic subunit of six distinct families of nuclear complexes. These complexes repress gene transcription through removing acetyl groups from lysine residues in histone tails. In addition to the deacetylase subunit, these complexes typically contain transcription factor and/or chromatin binding activities. The MIER:HDAC complex has hitherto been poorly characterized. Here, we show that MIER1 unexpectedly co-purifies with an H2A:H2B histone dimer. We show that MIER1 is also able to bind a complete histone octamer. Intriguingly, we found that a larger MIER1:HDAC1:BAHD1:C1QBP complex additionally co-purifies with an intact nucleosome on which H3K27 is either di- or tri-methylated. Together this suggests that the MIER1 complex acts downstream of PRC2 to expand regions of repressed chromatin and could potentially deposit histone octamer onto nucleosome-depleted regions of DNA.
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Affiliation(s)
- Siyu Wang
- Institute for Structural and Chemical Biology & Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
| | - Louise Fairall
- Institute for Structural and Chemical Biology & Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
| | - Trong Khoa Pham
- School of Biosciences, University of Sheffield, Sheffield S10 2TN, UK
- biOMICS facility, Mass Spectrometry Centre, University of Sheffield, Sheffield S10 2TN, UK
| | - Timothy J Ragan
- Institute for Structural and Chemical Biology & Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
| | - Dipti Vashi
- Institute for Structural and Chemical Biology & Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
| | - Mark O Collins
- School of Biosciences, University of Sheffield, Sheffield S10 2TN, UK
- biOMICS facility, Mass Spectrometry Centre, University of Sheffield, Sheffield S10 2TN, UK
| | - Cyril Dominguez
- Institute for Structural and Chemical Biology & Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
| | - John W R Schwabe
- Institute for Structural and Chemical Biology & Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
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Sandhu J, Li S, Fairall L, Pfisterer SG, Gurnett JE, Xiao X, Weston TA, Vashi D, Ferrari A, Orozco JL, Hartman CL, Strugatsky D, Lee SD, He C, Hong C, Jiang H, Bentolila LA, Gatta AT, Levine TP, Ferng A, Lee R, Ford DA, Young SG, Ikonen E, Schwabe JWR, Tontonoz P. Aster Proteins Facilitate Nonvesicular Plasma Membrane to ER Cholesterol Transport in Mammalian Cells. Cell 2018; 175:514-529.e20. [PMID: 30220461 DOI: 10.1016/j.cell.2018.08.033] [Citation(s) in RCA: 153] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 06/08/2018] [Accepted: 08/15/2018] [Indexed: 11/28/2022]
Abstract
The mechanisms underlying sterol transport in mammalian cells are poorly understood. In particular, how cholesterol internalized from HDL is made available to the cell for storage or modification is unknown. Here, we describe three ER-resident proteins (Aster-A, -B, -C) that bind cholesterol and facilitate its removal from the plasma membrane. The crystal structure of the central domain of Aster-A broadly resembles the sterol-binding fold of mammalian StARD proteins, but sequence differences in the Aster pocket result in a distinct mode of ligand binding. The Aster N-terminal GRAM domain binds phosphatidylserine and mediates Aster recruitment to plasma membrane-ER contact sites in response to cholesterol accumulation in the plasma membrane. Mice lacking Aster-B are deficient in adrenal cholesterol ester storage and steroidogenesis because of an inability to transport cholesterol from SR-BI to the ER. These findings identify a nonvesicular pathway for plasma membrane to ER sterol trafficking in mammals.
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Affiliation(s)
- Jaspreet Sandhu
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA; Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Shiqian Li
- Department of Anatomy and Research Programs Unit, Faculty of Medicine, University of Helsinki, Helsinki 00290, Finland; Minerva Foundation Institute for Medical Research, Helsinki 00290, Finland
| | - Louise Fairall
- Institute of Structural and Chemical Biology, Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
| | - Simon G Pfisterer
- Department of Anatomy and Research Programs Unit, Faculty of Medicine, University of Helsinki, Helsinki 00290, Finland; Minerva Foundation Institute for Medical Research, Helsinki 00290, Finland
| | - Jennifer E Gurnett
- Institute of Structural and Chemical Biology, Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
| | - Xu Xiao
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Thomas A Weston
- Department of Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Dipti Vashi
- Institute of Structural and Chemical Biology, Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
| | - Alessandra Ferrari
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Jose L Orozco
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Celine L Hartman
- Edward A. Doisy Department of Biochemistry and Molecular Biology, and Center for Cardiovascular Research, Saint Louis University School of Medicine, St. Louis, MO 63104, USA
| | - David Strugatsky
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Stephen D Lee
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Cuiwen He
- Department of Medicine, Division of Cardiology, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Cynthia Hong
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Haibo Jiang
- Centre for Microscopy, Characterisation and Analysis, University of Western Australia, Perth 6009, Australia
| | - Laurent A Bentolila
- California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA
| | - Alberto T Gatta
- Department of Cell Biology, UCL Institute of Ophthalmology, London, UK
| | - Tim P Levine
- Department of Cell Biology, UCL Institute of Ophthalmology, London, UK
| | - Annie Ferng
- Ionis Pharmaceuticals, Carlsbad, CA 92008, USA
| | - Richard Lee
- Ionis Pharmaceuticals, Carlsbad, CA 92008, USA
| | - David A Ford
- Edward A. Doisy Department of Biochemistry and Molecular Biology, and Center for Cardiovascular Research, Saint Louis University School of Medicine, St. Louis, MO 63104, USA
| | - Stephen G Young
- Department of Medicine, Division of Cardiology, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Elina Ikonen
- Department of Anatomy and Research Programs Unit, Faculty of Medicine, University of Helsinki, Helsinki 00290, Finland; Minerva Foundation Institute for Medical Research, Helsinki 00290, Finland
| | - John W R Schwabe
- Institute of Structural and Chemical Biology, Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
| | - Peter Tontonoz
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA; Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.
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Pawluczyk IZA, Ghaderi Najafabadi M, Patel S, Desai P, Vashi D, Saleem MA, Topham PS. Sialic acid attenuates puromycin aminonucleoside-induced desialylation and oxidative stress in human podocytes. Exp Cell Res 2013; 320:258-68. [PMID: 24200502 DOI: 10.1016/j.yexcr.2013.10.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 10/07/2013] [Accepted: 10/27/2013] [Indexed: 01/26/2023]
Abstract
Sialoglycoproteins make a significant contribution to the negative charge of the glomerular anionic glycocalyx-crucial for efficient functioning of the glomerular permselective barrier. Defects in sialylation have serious consequences on podocyte function leading to the development of proteinuria. The aim of the current study was to investigate potential mechanisms underlying puromycin aminonucleosisde (PAN)-induced desialylation and to ascertain whether they could be corrected by administration of free sialic acid. PAN treatment of podocytes resulted in a loss of sialic acid from podocyte proteins. This was accompanied by a reduction, in the expression of sialyltransferases and a decrease in the key enzyme of sialic acid biosynthesis N-acetylglucosamine 2-epimerase/N-acetylmannosamine kinase (GNE). PAN treatment also attenuated expression of the antioxidant enzyme superoxide dismutase (mSOD) and concomitantly increased the generation of superoxide anions. Sialic acid supplementation rescued podocyte protein sialylation and partially restored expression of sialyltransferases. Sialic acid also restored mSOD mRNA expression and quenched the oxidative burst. These data suggest that PAN-induced aberrant sialylation occurs as a result of modulation of enzymes involved sialic acid metabolism some of which are affected by oxidative stress. These data suggest that sialic acid therapy not only reinstates functionally important negative charge but also acts a source of antioxidant activity.
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Affiliation(s)
- Izabella Z A Pawluczyk
- Department of Infection, Immunity and Inflammation, University of Leicester, Maurice Shock Building, University Road, Leicester, LE1 9HN, UK; John Walls Renal Unit, Leicester General Hospital, Leicester, UK.
| | - Maryam Ghaderi Najafabadi
- Department of Infection, Immunity and Inflammation, University of Leicester, Maurice Shock Building, University Road, Leicester, LE1 9HN, UK
| | - Samita Patel
- Department of Infection, Immunity and Inflammation, University of Leicester, Maurice Shock Building, University Road, Leicester, LE1 9HN, UK; John Walls Renal Unit, Leicester General Hospital, Leicester, UK
| | - Priyanka Desai
- Department of Infection, Immunity and Inflammation, University of Leicester, Maurice Shock Building, University Road, Leicester, LE1 9HN, UK
| | - Dipti Vashi
- Department of Infection, Immunity and Inflammation, University of Leicester, Maurice Shock Building, University Road, Leicester, LE1 9HN, UK
| | - Moin A Saleem
- Academic and Children's Renal Unit, University of Bristol, Southmead Hospital, Bristol, UK
| | - Peter S Topham
- Department of Infection, Immunity and Inflammation, University of Leicester, Maurice Shock Building, University Road, Leicester, LE1 9HN, UK; John Walls Renal Unit, Leicester General Hospital, Leicester, UK
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