0000000001139644

AUTHOR

Christina Bartusch

showing 3 related works from this author

Rab33B Controls Hepatitis B Virus Assembly by Regulating Core Membrane Association and Nucleocapsid Processing

2017

Many viruses take advantage of cellular trafficking machineries to assemble and release new infectious particles. Using RNA interference (RNAi), we demonstrate that the Golgi/autophagosome-associated Rab33B is required for hepatitis B virus (HBV) propagation in hepatoma cell lines. While Rab33B is dispensable for the secretion of HBV subviral envelope particles, its knockdown reduced the virus yield to 20% and inhibited nucleocapsid (NC) formation and/or NC trafficking. The overexpression of a GDP-restricted Rab33B mutant phenocopied the effect of deficit Rab33B, indicating that Rab33B-specific effector proteins may be involved. Moreover, we found that HBV replication enhanced Rab33B expres…

0301 basic medicineHepatitis B virusBiologymedicine.disease_causeVirusArticleCell LineCell membraneRab33B03 medical and health sciencesnucleocapsid assemblyTranscription (biology)RNA interferenceVirologymedicineHumansSecretionNucleocapsidcore/capsid membrane associationHepatitis B virus030102 biochemistry & molecular biologyEffectorVirus AssemblyCell MembraneVirologyHepatitis B Core Antigenshepatitis B virus; Rab GTPase; Rab33B; core/capsid membrane association; nucleocapsid assembly; virus traffickingTransport proteinProtein Transport030104 developmental biologyInfectious Diseasesmedicine.anatomical_structurevirus traffickingrab GTP-Binding ProteinsHost-Pathogen InteractionsHepatocytesRab GTPaseViruses; Volume 9; Issue 6; Pages: 157
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ESCRT Requirements for Murine Leukemia Virus Release

2016

The Murine Leukemia Virus (MLV) is a gammaretrovirus that hijack host components of the endosomal sorting complex required for transport (ESCRT) for budding. To determine the minimal requirements for ESCRT factors in MLV viral and viral-like particles (VLP) release, an siRNA knockdown screen of ESCRT(-associated) proteins was performed in MLV-producing human cells. We found that MLV VLPs and virions primarily engage the ESCRT-I factor Tsg101 and marginally the ESCRT-associated adaptors Nedd4-1 and Alix to enter the ESCRT pathway. Conversely, the inactivation of ESCRT-II had no impact on VLP and virion egress. By analyzing the effects of individual ESCRT-III knockdowns, VLP and virion releas…

0301 basic medicineMLV; VLPs; retroviral budding; viral late domain; ESCRT; MVB pathway; CHMP1AEndosomevirusesGenetic Vectorslcsh:QR1-502CHMP1AGene ExpressionGene Products gagMLVmacromolecular substanceslcsh:MicrobiologyArticleESCRTCell LineESCRTMice03 medical and health sciencesviral late domainMVB pathwayVirologyGene OrderMurine leukemia virusAnimalsHumansVLPsTSG101Viral sheddingVirus Releaseretroviral buddingGammaretrovirusBuddingEndosomal Sorting Complexes Required for Transportbiologybiochemical phenomena metabolism and nutritionbiology.organism_classificationVirologyVirus ReleaseLeukemia Virus Murine030104 developmental biologyInfectious DiseasesGene Knockdown TechniquesRetroviridae InfectionsViruses
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Hepatitis B Virus Subverts the Autophagy Elongation Complex Atg5-12/16L1 and Does Not Require Atg8/LC3 Lipidation for Viral Maturation

2018

ABSTRACT Previous studies indicated that hepatitis B virus (HBV) stimulates autophagy to favor its production. To understand how HBV co-opts autophagy as a proviral machinery, we studied the roles of key autophagy proteins in HBV-replicating liver cell cultures. RNA interference-mediated silencing of Atg5, Atg12, and Atg16L1, which promote autophagophore expansion and LC3 membrane conjugation, interfered with viral core/nucleocapsid (NC) formation/stability and strongly diminished virus yields. Concomitantly, the core/NC membrane association and their sorting to envelope-positive compartments were perturbed. A close inspection of the HBV/autophagy cross talk revealed that the virus depended…

0301 basic medicineHepatitis B virusATG8Autophagosome maturationImmunologyATG5Autophagy-Related ProteinsBiologymedicine.disease_causeVirus ReplicationMicrobiologyVirusAutophagy-Related Protein 5ATG1203 medical and health sciencesVirologyCell Line TumormedicineAutophagyHumansHepatitis B virusAutophagyAutophagy-Related Protein 8 FamilyHepatitis BCell biologyVirus-Cell Interactions030104 developmental biologyViral replicationInsect ScienceGene Knockdown TechniquesMultiprotein ComplexesMicrotubule-Associated ProteinsAutophagy-Related Protein 12
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