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Crespo R, Ne E, Reinders J, Meier JI, Li C, Jansen S, Górska A, Koçer S, Kan TW, Doff W, Dekkers D, Demmers J, Palstra RJ, Rao S, Mahmoudi T. PCID2 dysregulates transcription and viral RNA processing to promote HIV-1 latency. iScience 2024; 27:109152. [PMID: 38384833 PMCID: PMC10879814 DOI: 10.1016/j.isci.2024.109152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 12/06/2023] [Accepted: 02/01/2024] [Indexed: 02/23/2024] Open
Abstract
HIV-1 latency results from tightly regulated molecular processes that act at distinct steps of HIV-1 gene expression. Here, we characterize PCI domain-containing 2 (PCID2) protein, a subunit of the transcription and export complex 2 (TREX2) complex, to enforce transcriptional repression and post-transcriptional blocks to HIV-1 gene expression during latency. PCID2 bound the latent HIV-1 LTR (long terminal repeat) and repressed transcription initiation during latency. Depletion of PCID2 remodeled the chromatin landscape at the HIV-1 promoter and resulted in transcriptional activation and latency reversal. Immunoprecipitation coupled to mass spectrometry identified PCID2-interacting proteins to include negative viral RNA (vRNA) splicing regulators, and PCID2 depletion resulted in over-splicing of intron-containing vRNA in cell lines and primary cells obtained from PWH. MCM3AP and DSS1, two other RNA-binding TREX2 complex subunits, also inhibit transcription initiation and vRNA alternative splicing during latency. Thus, PCID2 is a novel HIV-1 latency-promoting factor, which in context of the TREX2 sub-complex PCID2-DSS1-MCM3AP blocks transcription and dysregulates vRNA processing.
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Affiliation(s)
- Raquel Crespo
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Enrico Ne
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Julian Reinders
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Jenny I.J. Meier
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Chengcheng Li
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Sanne Jansen
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Alicja Górska
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Selin Koçer
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Tsung Wai Kan
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
- Department of Pathology, Erasmus University Medical Center, Rotterdam, the Netherlands
- Department of Urology, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Wouter Doff
- Proteomics Center, Erasmus University Medical Center, Ee679a PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Dick Dekkers
- Proteomics Center, Erasmus University Medical Center, Ee679a PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Jeroen Demmers
- Proteomics Center, Erasmus University Medical Center, Ee679a PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Robert-Jan Palstra
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
- Department of Pathology, Erasmus University Medical Center, Rotterdam, the Netherlands
- Department of Urology, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Shringar Rao
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
| | - Tokameh Mahmoudi
- Department of Biochemistry, Erasmus University Medical Center, Ee622 PO Box 2040, 3000 CA Rotterdam, the Netherlands
- Department of Pathology, Erasmus University Medical Center, Rotterdam, the Netherlands
- Department of Urology, Erasmus University Medical Center, Rotterdam, the Netherlands
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2
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Pernin F, Cui QL, Mohammadnia A, Fernandes MGF, Hall JA, Srour M, Dudley RWR, Zandee SEJ, Klement W, Prat A, Salapa HE, Levin MC, Moore GRW, Kennedy TE, Vande Velde C, Antel JP. Regulation of stress granule formation in human oligodendrocytes. Nat Commun 2024; 15:1524. [PMID: 38374028 PMCID: PMC10876533 DOI: 10.1038/s41467-024-45746-6] [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: 06/09/2023] [Accepted: 01/31/2024] [Indexed: 02/21/2024] Open
Abstract
Oligodendrocyte (OL) injury and subsequent loss is a pathologic hallmark of multiple sclerosis (MS). Stress granules (SGs) are membrane-less organelles containing mRNAs stalled in translation and considered as participants of the cellular response to stress. Here we show SGs in OLs in active and inactive areas of MS lesions as well as in normal-appearing white matter. In cultures of primary human adult brain derived OLs, metabolic stress conditions induce transient SG formation in these cells. Combining pro-inflammatory cytokines, which alone do not induce SG formation, with metabolic stress results in persistence of SGs. Unlike sodium arsenite, metabolic stress induced SG formation is not blocked by the integrated stress response inhibitor. Glycolytic inhibition also induces persistent SGs indicating the dependence of SG formation and disassembly on the energetic glycolytic properties of human OLs. We conclude that SG persistence in OLs in MS reflects their response to a combination of metabolic stress and pro-inflammatory conditions.
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Affiliation(s)
- Florian Pernin
- Neuroimmunology Unit, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
| | - Qiao-Ling Cui
- Neuroimmunology Unit, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
| | | | - Milton G F Fernandes
- Neuroimmunology Unit, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
| | - Jeffery A Hall
- Department of Neurosurgery, McGill University Health Centre, Montreal, QC, Canada
| | - Myriam Srour
- Division of Pediatric Neurology, Montreal Children's Hospital, Montreal, QC, Canada
| | - Roy W R Dudley
- Department of Pediatric Neurosurgery, Montreal Children's Hospital, Montreal, QC, Canada
| | - Stephanie E J Zandee
- Centre de Recherche Hospitalier de l'Université de Montréal, Montréal, QC, Canada
| | - Wendy Klement
- Centre de Recherche Hospitalier de l'Université de Montréal, Montréal, QC, Canada
| | - Alexandre Prat
- Centre de Recherche Hospitalier de l'Université de Montréal, Montréal, QC, Canada
| | - Hannah E Salapa
- Cameco Multiple Sclerosis Neuroscience Research Center, University of Saskatchewan, Saskatoon, SK, Canada
| | - Michael C Levin
- Cameco Multiple Sclerosis Neuroscience Research Center, University of Saskatchewan, Saskatoon, SK, Canada
| | - G R Wayne Moore
- Neuroimmunology Unit, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
| | - Timothy E Kennedy
- Neuroimmunology Unit, Montreal Neurological Institute, McGill University, Montreal, QC, Canada
| | | | - Jack P Antel
- Neuroimmunology Unit, Montreal Neurological Institute, McGill University, Montreal, QC, Canada.
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3
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Krishnan A, Burroughs AM, Iyer LM, Aravind L. Unexpected Evolution of Lesion-Recognition Modules in Eukaryotic NER and Kinetoplast DNA Dynamics Proteins from Bacterial Mobile Elements. iScience 2018; 9:192-208. [PMID: 30396152 PMCID: PMC6222260 DOI: 10.1016/j.isci.2018.10.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 10/15/2018] [Accepted: 10/15/2018] [Indexed: 12/29/2022] Open
Abstract
The provenance of several components of major uniquely eukaryotic molecular machines are increasingly being traced back to prokaryotic biological conflict systems. Here, we demonstrate that the N-terminal single-stranded DNA-binding domain from the anti-restriction protein ArdC, deployed by bacterial mobile elements against their host, was independently acquired twice by eukaryotes, giving rise to the DNA-binding domains of XPC/Rad4 and the Tc-38-like proteins in the stem kinetoplastid. In both instances, the ArdC-N domain tandemly duplicated forming an extensive DNA-binding interface. In XPC/Rad4, the ArdC-N domains (BHDs) also fused to the inactive transglutaminase domain of a peptide-N-glycanase ultimately derived from an archaeal conflict system. Alongside, we delineate several parallel acquisitions from conjugative elements/bacteriophages that gave rise to key components of the kinetoplast DNA (kDNA) replication apparatus. These findings resolve two outstanding questions in eukaryote biology: (1) the origin of the unique DNA lesion-recognition component of NER and (2) origin of the unusual, plasmid-like features of kDNA.
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Affiliation(s)
- Arunkumar Krishnan
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA
| | - A Maxwell Burroughs
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA
| | - Lakshminarayan M Iyer
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA
| | - L Aravind
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA.
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Abstract
Pre-mRNA processing protein 40 (Prp40) is a nuclear protein that has a role in pre-mRNA splicing. Prp40 possesses two leucine-rich nuclear export signals, but little is known about the function of Prp40 in the export process. Another protein that has a role in protein export is centrin, a member of the EF-hand superfamily of Ca2+-binding proteins. Prp40 was found to be a centrin target by yeast-two-hybrid screening using both Homo sapiens centrin 2 (Hscen2) and Chlamydomonas reinhardtii centrin (Crcen). We identified a centrin-binding site within H. sapiens Prp40 homolog A (HsPrp40A), which contains a hydrophobic triad W1L4L8 that is known to be important in the interaction with centrin. This centrin-binding site is highly conserved within the first nuclear export signal consensus sequence identified in Saccharomyces cerevisiae Prp40. Here, we examine the interaction of HsPrp40A peptide (HsPrp40Ap) with both Hscen2 and Crcen by isothermal titration calorimetry. We employed the thermodynamic parameterization to estimate the polar and apolar surface area of the interface. In addition, we have defined the molecular mechanism of thermally induced unfolding and dissociation of the Crcen-HsPrp40Ap complex using two-dimensional infrared correlation spectroscopy. These complementary techniques showed for the first time, to our knowledge, that HsPrp40Ap interacts with centrin in vitro, supporting a coupled functional role for these proteins in pre-mRNA splicing.
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McClure-Begley TD, Klymkowsky MW. Nuclear roles for cilia-associated proteins. Cilia 2017; 6:8. [PMID: 28560031 PMCID: PMC5445336 DOI: 10.1186/s13630-017-0052-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 05/02/2017] [Indexed: 01/23/2023] Open
Abstract
Cilia appear to be derived, evolutionarily, from structures present in the ancestral (pre-ciliary) eukaryote, such as microtubule-based vesicle trafficking and chromosome segregation systems. Experimental observations suggest that the ciliary gate, the molecular complex that mediates the selective molecular movement between cytoplasmic and ciliary compartments, shares features with nuclear pores. Our hypothesis is that this shared transport machinery is at least partially responsible for the observation that a number of ciliary and ciliogenesis-associated proteins are found within nuclei where they play roles in the regulation of gene expression, DNA repair, and nuclear import and export. Recognizing the potential for such nuclear roles is critical when considering the phenotypic effects that arise from the mutational modification of ciliary proteins.
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Affiliation(s)
- Tristan D McClure-Begley
- Molecular, Cellular and Developmental Biology, University of Colorado Boulder, Boulder, CO 80309 USA
| | - Michael W Klymkowsky
- Molecular, Cellular and Developmental Biology, University of Colorado Boulder, Boulder, CO 80309 USA
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6
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Zhao Y, Shi J, Winey M, Klymkowsky MW. Identifying domains of EFHC1 involved in ciliary localization, ciliogenesis, and the regulation of Wnt signaling. Dev Biol 2016; 411:257-265. [PMID: 26783883 DOI: 10.1016/j.ydbio.2016.01.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 11/16/2015] [Accepted: 01/07/2016] [Indexed: 12/24/2022]
Abstract
EFHC1 encodes a ciliary protein that has been linked to Juvenile Myoclonic Epilepsy. In ectodermal explants, derived from Xenopus laevis embryos, the morpholino-mediated down-regulation of EFHC1b inhibited multiciliated cell formation. In those ciliated cells that did form, axoneme but not basal body formation was inhibited. EFHC1b morphant embryos displayed defects in central nervous system (CNS) and neural crest patterning that were rescued by a EFHC1b-GFP chimera. EFHC1b-GFP localized to ciliary axonemes in epidermal, gastrocoele roof plate, and neural tube cells. In X. laevis there is a link between Wnt signaling and multiciliated cell formation. While down-regulation of EFHC1b led to a ~2-fold increase in the activity of the β-catenin/Wnt-responsive TOPFLASH reporter, EFHC1b-GFP did not inhibit β-catenin activation of TOPFLASH. Wnt8a RNA levels were increased in EFHC1b morphant ectodermal explants and intact embryos, analyzed prior to the on-set of ciliogenesis. Rescue of the EFHC1b MO's ciliary axonemal phenotypes required the entire protein; in contrast, the EFHC1b morpholino's Wnt8a, CNS, and neural crest phenotypes were rescued by a truncated form of EFHC1b. The EFHC1b morpholino's Wnt8a phenotype was also rescued by the injection of RNAs encoding secreted Wnt inhibitors, suggesting that these phenotypes are due to effects on Wnt signaling, rather than the loss of cilia, an observation of potential relevance to understanding EFHC1's role in human neural development.
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Affiliation(s)
- Ying Zhao
- Molecular, Cellular & Developmental Biology, University of Colorado Boulder Boulder, Colorado 80309-0347, USA
| | - Jianli Shi
- Molecular, Cellular & Developmental Biology, University of Colorado Boulder Boulder, Colorado 80309-0347, USA
| | - Mark Winey
- Molecular, Cellular & Developmental Biology, University of Colorado Boulder Boulder, Colorado 80309-0347, USA
| | - Michael W Klymkowsky
- Molecular, Cellular & Developmental Biology, University of Colorado Boulder Boulder, Colorado 80309-0347, USA.
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Shi J, Zhao Y, Vonderfecht T, Winey M, Klymkowsky MW. Centrin-2 (Cetn2) mediated regulation of FGF/FGFR gene expression in Xenopus. Sci Rep 2015; 5:10283. [PMID: 26014913 PMCID: PMC4650658 DOI: 10.1038/srep10283] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 03/27/2015] [Indexed: 01/06/2023] Open
Abstract
Centrins (Cetns) are highly conserved, widely expressed, and multifunctional Ca2+-binding eukaryotic signature proteins best known for their roles in ciliogenesis and as critical components of the global genome nucleotide excision repair system. Two distinct Cetn subtypes, Cetn2-like and Cetn3-like, have been recognized and implicated in a range of cellular processes. In the course of morpholino-based loss of function studies in Xenopus laevis, we have identified a previously unreported Cetn2-specific function, namely in fibroblast growth factor (FGF) mediated signaling, specifically through the regulation of FGF and FGF receptor RNA levels. Cetn2 was found associated with the RNA polymerase II binding sites of the Cetn2-regulated FGF8 and FGFR1a genes, but not at the promoter of a gene (BMP4) whose expression was altered indirectly in Cent2 morphant embryos. These observations point to a previously unexpected role of Cetn2 in the regulation of gene expression and embryonic development.
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Affiliation(s)
- Jianli Shi
- Molecular, Cellular &Developmental Biology University of Colorado Boulder, Boulder, Colorado 80309
| | - Ying Zhao
- Molecular, Cellular &Developmental Biology University of Colorado Boulder, Boulder, Colorado 80309
| | - Tyson Vonderfecht
- Molecular, Cellular &Developmental Biology University of Colorado Boulder, Boulder, Colorado 80309
| | - Mark Winey
- Molecular, Cellular &Developmental Biology University of Colorado Boulder, Boulder, Colorado 80309
| | - Michael W Klymkowsky
- Molecular, Cellular &Developmental Biology University of Colorado Boulder, Boulder, Colorado 80309
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Liu Q, Hu G, Cao Z, Wang J, Chen H. Conformational stability of PCID2 upon DSS1 binding with molecular dynamics simulation. J Mol Model 2015; 21:127. [PMID: 25914122 DOI: 10.1007/s00894-015-2664-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 03/23/2015] [Indexed: 11/26/2022]
Abstract
DSS1 is a small acidic intrinsically disordered protein (IDP) that can fold upon binding with PCID2 TREX-2. The resulting complex plays a key role in mRNA export. However, the binding mechanism between DSS1 and PCID2 is unsolved. Here, three independent 500-ns molecular dynamics (MD) simulations were performed to study the DSS1-PCID2 binding mechanism by comparing apo-PCID2 and bound PCID2. The results show that the conformational variation of bound PCID2 is smaller than that of apo-PCID2, especially in the binding domain of two helices (helix IV and VIII). The probability of coil formation between helix III and helix IV of bound PCID2 increases, and a short anti-parallel β-sheet forms upon DSS1 binding. The decomposition of binding free energy into protein and residue pairs suggests that electrostatic and hydrophobic interactions play key roles in the recognition between DSS1 and PCID2. There is a hydrophobic core of seven residues in DSS1 favorable to the binding of PCID2. These analytical methods can be used to reveal the recognition mechanisms of other IDPs and their partners.
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Affiliation(s)
- Qianjun Liu
- Shandong Provincial Key Laboratory of Functional Macromolecular Biophysics, College of Physics and Electronic Information, Dezhou University, Dezhou, 253023, China
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Sun L, Hartson SD, Matts RL. Identification of proteins associated with Aha1 in HeLa cells by quantitative proteomics. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1854:365-80. [PMID: 25614414 DOI: 10.1016/j.bbapap.2015.01.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 12/20/2014] [Accepted: 01/09/2015] [Indexed: 01/17/2023]
Abstract
The identification of the activator of heat shock protein 90 (Hsp90) ATPase's (Aha1) protein-protein interaction (PPI) network will provide critical insights into the relationship of Aha1 with multi-molecular complexes and shed light onto Aha1's interconnections with Hsp90-regulated biological functions. Flag-tagged Aha1 was over-expressed in HeLa cells and isolated by anti-Flag affinity pull downs, followed by trypsin digestion and identification co-adsorbing proteins by liquid chromatography-tandem mass spectroscopy (LC-MS/MS). A probability-based identification of Aha1 PPIs was generated from the LC-MS/MS analysis by using a relative quantification strategy, spectral counting (SC). By comparing the SC-based protein levels between Aha1 pull-down samples and negative controls, 164 Aha1-interacting proteins were identified that were quantitatively enriched in the pull-down samples over the controls. The identified Aha1-interacting proteins are involved in a wide number of intracellular bioprocesses, including DNA maintenance, chromatin structure, RNA processing, translation, nucleocytoplasmic and vesicle transport, among others. The interactions of 33 of the identified proteins with Aha1 were further confirmed by Western blotting, demonstrating the reliability of our affinity-purification-coupled quantitative SC-MS strategy. Our proteomic data suggests that Aha1 may participate in diverse biological pathways to facilitate Hsp90 chaperone functions in response to stress.
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Affiliation(s)
- Liang Sun
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA
| | - Steven D Hartson
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA
| | - Robert L Matts
- Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA.
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Et Taouil A, Brun E, Duchambon P, Blouquit Y, Gilles M, Maisonhaute E, Sicard-Roselli C. How protein structure affects redox reactivity: example of Human centrin 2. Phys Chem Chem Phys 2014; 16:24493-8. [DOI: 10.1039/c4cp03536d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Human centrin 2 is a protein very sensitive to oxidative stress. Protein reactivity is unraveled by gamma radiolysis and electrochemical techniques.
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Affiliation(s)
- Abdeslam Et Taouil
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8235
- Laboratoire Interfaces et Systèmes Electrochimiques
- Paris, France
| | - Emilie Brun
- Laboratoire de Chimie Physique
- CNRS UMR 8000
- Université Paris-Sud
- Bât. 350
- 91405 Orsay Cedex, France
| | - Patricia Duchambon
- Plateforme Production Protéines Recombinantes
- Institut Curie-INSERM U759
- Université Paris-Sud
- 91405 Orsay Cedex, France
| | - Yves Blouquit
- Institut Curie-INSERM U759
- Université Paris-Sud
- 91405 Orsay Cedex, France
| | - Manon Gilles
- Laboratoire de Chimie Physique
- CNRS UMR 8000
- Université Paris-Sud
- Bât. 350
- 91405 Orsay Cedex, France
| | - Emmanuel Maisonhaute
- Sorbonne Universités
- UPMC Univ Paris 06
- UMR 8235
- Laboratoire Interfaces et Systèmes Electrochimiques
- Paris, France
| | - Cécile Sicard-Roselli
- Laboratoire de Chimie Physique
- CNRS UMR 8000
- Université Paris-Sud
- Bât. 350
- 91405 Orsay Cedex, France
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