title: New insights into the induction of the heat shock proteins in baculovirus infected insect cells.
abstract: Eight members of the HSP/HSC70 family were identified in Spodoptera frugiperda Sf9 cells infected with Autographa californica multiple nucleopolyhedrovirus (AcMNPV) by 2D electrophoresis followed by mass spectrometry (MALDI/TOF) and a Mascot search. The family includes five HSP70s induced by AcMNPV-infection and three constitutive cognate HSC70s that remained abundant in infected cells. Confocal microscopy revealed dynamic changes in subcellular localization of HSP/HSC70s in the course of infection. At the early stages (4 to 10 hpi), a fraction of HSPs is localized in distinct speckles in cytoplasm. The speckles contained ubiquitinylated proteins suggesting that they may be aggresomes where proteins targeted by ubiquitin are sequestered or processed for proteolysis. S. frugiperda HSP90 was identified in the 2D gels by Western blotting. Its amount was unchanged during infection. A selective inhibitor of HSP90, 17-AAG, decreased the rate of viral DNA synthesis in infected cells suggesting a supportive role of HSP90 in virus replication.
authors: NK Koltzov Institute of Developmental Biology, Russian Academy of Sciences, 26 Vavilova Str., Moscow 119991, Russia.
authors: Yulia V
authors: YV
authors: Lyupina
authors: Olga G
authors: OG
authors: Zatsepina
authors: Anna V
authors: AV
authors: Timokhova
authors: Olga V
authors: OV
authors: Orlova
authors: Margarita V
authors: MV
authors: Kostyuchenko
authors: Svetlana N
authors: SN
authors: Beljelarskaya
authors: Michael B
authors: MB
authors: Evgen'ev
authors: Victor S
authors: VS
authors: Mikhailov
mesh_terms: D000818:Animals; D015180:Electrophoresis, Gel, Two-Dimensional; D018840:HSP70 Heat-Shock Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D018841:HSP90 Heat-Shock Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D019476:Insect Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D017924:Nucleopolyhedroviruses / Q000235:genetics / Q000502:physiology*; D018411:Spodoptera / Q000737:chemistry / Q000235:genetics / Q000378:metabolism* / Q000821:virology*
chemical_list: D018840:HSP70 Heat-Shock Proteins; D018841:HSP90 Heat-Shock Proteins; D019476:Insect Proteins