title: Interaction between a 54-kilodalton mammalian cell surface protein and cowpea mosaic virus.
abstract: Cowpea mosaic virus (CPMV), a plant virus that is a member of the picornavirus superfamily, is increasingly being used for nanotechnology applications, including material science, vascular imaging, vaccine development, and targeted drug delivery. For these applications, it is critical to understand the in vivo interactions of CPMV within the mammalian system. Although the bioavailability of CPMV in the mouse has been demonstrated, the specific interactions between CPMV and mammalian cells need to be characterized further. Here we demonstrate that although the host range for replication of CPMV is confined to plants, mammalian cells nevertheless bind and internalize CPMV in significant amounts. This binding is mediated by a conserved 54-kDa protein found on the plasma membranes of both human and murine cell lines. Studies using a deficient cell line, deglycosidases, and glycosylation inhibitors showed that the CPMV binding protein (CPMV-BP) is not glycosylated. A possible 47-kDa isoform of the CPMV-BP was also detected in the organelle and nuclear subcellular fraction prepared from murine fibroblasts. Further characterization of CPMV-BP is important to understand how CPMV is trafficked through the mammalian system and may shed light on how picornaviruses may have evolved between plant and animal hosts.
authors.affiliation: Department of Cell Biology and Center for Integrative Molecular Biosciences, The Scripps Research Institute, 10550 N. Torrey Pines Rd., La Jolla, CA 92037, USA.
authors.forename: Kristopher J
authors.initials: KJ
authors.lastname: Koudelka
authors.forename: Chris S
authors.initials: CS
authors.lastname: Rae
authors.forename: Maria J
authors.initials: MJ
authors.lastname: Gonzalez
authors.forename: Marianne
authors.initials: M
authors.lastname: Manchester
mesh_terms: D000818:Animals; D016466:CHO Cells; D002478:Cells, Cultured; D017798:Comovirus / Q000378:metabolism*; D006224:Cricetinae; D003412:Cricetulus; D006801:Humans; D007425:Intracellular Membranes / Q000378:metabolism; D008322:Mammals; D008565:Membrane Proteins / Q000737:chemistry / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D015388:Organelles / Q000737:chemistry / Q000378:metabolism; D011485:Protein Binding; D020033:Protein Isoforms / Q000378:metabolism; D013045:Species Specificity
chemical_list: D008565:Membrane Proteins; D020033:Protein Isoforms