Abstract
Rotavirus infection induces profound alterations in the morphology and biochemistry of the host cell. Using two-dimensional (2D) gel electrophoresis combined with metabolic labeling, we have identified four proteins that are specifically upregulated in rotavirus-infected cells. Two of these have been identified as BiP (GRP78) and endoplasmin (GRP94), members of a family of glucose-regulated chaperone proteins that reside in the endoplasmic reticulum (ER) lumen, the site of rotavirus morphogenesis. The level of mRNA and the transcriptional activity of the BiP and endoplasmin genes are increased markedly in rotavirus-infected cells, and these genes are also induced when a single rotavirus protein, the nonstructural glycoprotein NSP4, is expressed in MA104 cells. However, NSP4 does not associate with either BiP or endoplasmin, implying that the mechanism of BiP and endoplasmin gene activation by NSP4 may differ from that triggered by viral membrane glycoproteins of other viruses. The interaction of BiP and endoplasmin with rotavirus structural polypeptides suggests that these chaperones are involved in the process of viral maturation in the ER lumen.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Binding Sites
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Carrier Proteins / biosynthesis*
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Carrier Proteins / genetics
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Carrier Proteins / metabolism
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Cell Line
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Endoplasmic Reticulum / metabolism*
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Endoplasmic Reticulum / virology*
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Endoplasmic Reticulum Chaperone BiP
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Gene Expression
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Glycoproteins / genetics
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HSP70 Heat-Shock Proteins / biosynthesis*
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HSP70 Heat-Shock Proteins / genetics
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HSP70 Heat-Shock Proteins / metabolism
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Heat-Shock Proteins*
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Macaca mulatta
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Membrane Proteins / biosynthesis*
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Membrane Proteins / genetics
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Membrane Proteins / metabolism
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Molecular Chaperones / biosynthesis*
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Molecular Chaperones / genetics
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Molecular Chaperones / metabolism
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RNA, Messenger / genetics
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RNA, Messenger / metabolism
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Rotavirus / genetics
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Rotavirus / growth & development
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Rotavirus / pathogenicity*
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Rotavirus Infections / genetics
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Rotavirus Infections / metabolism*
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Rotavirus Infections / virology
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Toxins, Biological
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Viral Nonstructural Proteins / genetics
Substances
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Carrier Proteins
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Endoplasmic Reticulum Chaperone BiP
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Glycoproteins
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HSP70 Heat-Shock Proteins
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Heat-Shock Proteins
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Membrane Proteins
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Molecular Chaperones
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NS28 protein, rotavirus
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RNA, Messenger
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Toxins, Biological
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Viral Nonstructural Proteins
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glucose-regulated proteins