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Contreras-Treviño HI, Reyna-Rosas E, León-Rodríguez R, Ruiz-Ordaz BH, Dinkova TD, Cevallos AM, Padilla-Noriega L. Species A rotavirus NSP3 acquires its translation inhibitory function prior to stable dimer formation. PLoS One 2017; 12:e0181871. [PMID: 28738064 PMCID: PMC5524322 DOI: 10.1371/journal.pone.0181871] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 07/07/2017] [Indexed: 11/18/2022] Open
Abstract
Species A rotavirus non-structural protein 3 (NSP3) is a translational regulator that inhibits or, under some conditions, enhances host cell translation. NSP3 binds to the translation initiation factor eIF4G1 and evicts poly-(A) binding protein (PABP) from eIF4G1, thus inhibiting translation of polyadenylated mRNAs, presumably by disrupting the effect of PABP bound to their 3’-ends. NSP3 has a long coiled-coil region involved in dimerization that includes a chaperone Hsp90-binding domain (HS90BD). We aimed to study the role in NSP3 dimerization of a segment of the coiled-coil region adjoining the HS90BD. We used a vaccinia virus system to express NSP3 with point mutations in conserved amino acids in the coiled-coil region and determined the effects of these mutations on translation by metabolic labeling of proteins as well as on accumulation of stable NSP3 dimers by non-dissociating Western blot, a method that separates stable NSP3 dimers from the monomer/dimerization intermediate forms of the protein. Four of five mutations reduced the total yield of NSP3 and the formation of stable dimers (W170A, K171E, R173E and R187E:K191E), whereas one mutation had the opposite effects (Y192A). Treatment with the proteasome inhibitor MG132 revealed that stable NSP3 dimers and monomers/dimerization intermediates are susceptible to proteasome degradation. Surprisingly, mutants severely impaired in the formation of stable dimers were still able to inhibit host cell translation, suggesting that NSP3 dimerization intermediates are functional. Our results demonstrate that rotavirus NSP3 acquires its function prior to stable dimer formation and remain as a proteasome target throughout dimerization.
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Affiliation(s)
- Hugo I. Contreras-Treviño
- Programa de Maestría y Doctorado en Ciencias Bioquímicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
- Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Edgar Reyna-Rosas
- Programa de Maestría y Doctorado en Ciencias Bioquímicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
- Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Renato León-Rodríguez
- Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Blanca H. Ruiz-Ordaz
- Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Tzvetanka D. Dinkova
- Departamento de Bioquímica, Facultad de Química, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Ana M. Cevallos
- Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Luis Padilla-Noriega
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
- Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
- * E-mail:
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Cotter CA, Earl PL, Wyatt LS, Moss B. Preparation of Cell Cultures and Vaccinia Virus Stocks. ACTA ACUST UNITED AC 2015; 39:14A.3.1-14A.3.18. [PMID: 26528781 DOI: 10.1002/9780471729259.mc14a03s39] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The culturing of cell lines used with vaccinia virus, both as monolayer and in suspension, is described. The preparation of chick embryo fibroblasts (CEF) is presented for use in the production of the highly attenuated and host range-restricted modified vaccinia virus Ankara (MVA) strain of vaccinia virus. Protocols for the preparation, titration, and trypsinization of vaccinia virus stocks, as well as viral DNA preparation and virus purification methods are also included.
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Affiliation(s)
- Catherine A Cotter
- National Institutes of Allergy and Infectious Diseases, Bethesda, Maryland
| | - Patricia L Earl
- National Institutes of Allergy and Infectious Diseases, Bethesda, Maryland
| | - Linda S Wyatt
- National Institutes of Allergy and Infectious Diseases, Bethesda, Maryland
| | - Bernard Moss
- National Institutes of Allergy and Infectious Diseases, Bethesda, Maryland
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Monastyrska I, Ulasli M, Rottier PJ, Guan JL, Reggiori F, de Haan CA. An autophagy-independent role for LC3 in equine arteritis virus replication. Autophagy 2013; 9:164-74. [PMID: 23182945 PMCID: PMC3552881 DOI: 10.4161/auto.22743] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Equine arteritis virus (EAV) is an enveloped, positive-strand RNA virus. Genome replication of EAV has been associated with modified intracellular membranes that are shaped into double-membrane vesicles (DMVs). We showed by immuno-electron microscopy that the DMVs induced in EAV-infected cells contain double-strand (ds)RNA molecules, presumed RNA replication intermediates, and are decorated with the autophagy marker protein microtubule-associated protein 1 light chain 3 (LC3). Replication of EAV, however, was not affected in autophagy-deficient cells lacking autophagy-related protein 7 (ATG7). Nevertheless, colocalization of DMVs and LC3 was still observed in these knockout cells, which only contain the nonlipidated form of LC3. Although autophagy is not required, depletion of LC3 markedly reduced the replication of EAV. EAV replication could be fully restored in these cells by expression of a nonlipidated form of LC3. These findings demonstrate an autophagy-independent role for LC3 in EAV replication. Together with the observation that EAV-induced DMVs are also positive for ER degradation-enhancing α-mannosidase-like 1 (EDEM1), our data suggested that this virus, similarly to the distantly-related mouse hepatitis coronavirus, hijacks the ER-derived membranes of EDEMosomes to ensure its efficient replication.
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Affiliation(s)
- Iryna Monastyrska
- Virology Division; Department of Infectious Diseases & Immunology; Utrecht University; Utrecht, The Netherlands
| | - Mustafa Ulasli
- Department of Cell Biology and Institute of Biomembranes; University Medical Center Utrecht; Utrecht, The Netherlands
| | - Peter J.M. Rottier
- Virology Division; Department of Infectious Diseases & Immunology; Utrecht University; Utrecht, The Netherlands
| | - Jun-Lin Guan
- Department of Internal Medicine-Division of Molecular Medicine and Genetics; Department of Cell and Developmental Biology; University of Michigan; Ann Arbor, MI USA
| | - Fulvio Reggiori
- Department of Cell Biology and Institute of Biomembranes; University Medical Center Utrecht; Utrecht, The Netherlands
| | - Cornelis A.M. de Haan
- Virology Division; Department of Infectious Diseases & Immunology; Utrecht University; Utrecht, The Netherlands
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Ma X, Serna A, Xu RH, Sigal LJ. The amino acid sequences flanking an antigenic determinant can strongly affect MHC class I cross-presentation without altering direct presentation. THE JOURNAL OF IMMUNOLOGY 2009; 182:4601-7. [PMID: 19342634 DOI: 10.4049/jimmunol.0803806] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Direct presentation (DP) and cross presentation (CP) on MHC I by professional APCs are defined by the internal or external source of the Ag, respectively. Although some Ags are substrates for both DP and CP, others are only substrates for DP. The reasons for this difference remain largely unknown. In this study, we studied in tissue culture and also in vivo, the effects of altering the length and sequence of the amino acid chains flanking an MHC class I restricted determinant (the chicken OVA OVA(258-265), SIINFEKL) that is normally a good substrate for both DP and CP. We demonstrate that CP but not DP strictly requires flanking N and C-terminal extensions of minimal length. Furthermore, we show that removal but not replacement of just one amino acid 22 residues downstream from the determinant is sufficient to strongly affect CP without affecting either protein stability or DP. Thus, our work shows that the flanking residues of an antigenic determinant can differentially affect CP and DP, and that features of the Ag other than half-life can have a major impact in CP. Our studies may have implications for understanding CP in viral infections and possibly for the design of new vaccines.
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Affiliation(s)
- Xueying Ma
- Fox Chase Cancer Center, Basic Sciences Division, Viral Pathogenesis Program, Philadelphia, PA 19111, USA
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