title: Multiple vesiculoviral matrix proteins inhibit both nuclear export and import.
abstract: The matrix (M) protein of vesicular stomatitis virus inhibits both nuclear import and export. Here, we demonstrate that this inhibitory property is conserved between the M proteins from two other vesiculoviruses, chandipura virus and spring viremia carp virus. All three M proteins completely block nuclear transport of spliced mRNA, small nuclear RNAs, and small nuclear ribonucleoproteins and slow the nuclear transport of many other cargoes. In all cases where transport was merely slowed by the M proteins, the chandipura virus M protein had the strongest inhibitory activity. When expressed in transfected HeLa cells, active M proteins displayed prominent association with the nuclear rim. Moreover, mutation of a conserved methionine abolished both the inhibitory activity and efficient targeting of the M proteins to the nuclear rim. We propose that all of the vesiculoviral M proteins associate with the same nuclear target, which is likely to be a component of the nuclear pore complex.
authors.affiliation: Department of Biomolecular Chemistry, University of Wisconsin, Madison, WI 53706-1532, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Petersen
authors.forename: L S
authors.initials: LS
authors.lastname: Her
authors.forename: J E
authors.initials: JE
authors.lastname: Dahlberg
mesh_terms: D021581:Active Transport, Cell Nucleus; D000595:Amino Acid Sequence; D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D008715:Methionine / Q000378:metabolism; D008969:Molecular Sequence Data; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D014721:Vesicular stomatitis Indiana virus / Q000235:genetics / Q000378:metabolism*; D018116:Vesiculovirus / Q000235:genetics / Q000378:metabolism*; D014763:Viral Matrix Proteins / Q000235:genetics / Q000378:metabolism*; D014982:Xenopus laevis
chemical_list: C094460:M protein, Vesicular stomatitis virus; C433768:M protein, chandipura virus; C433769:M protein, spring viremia carp virus; D011993:Recombinant Fusion Proteins; D014763:Viral Matrix Proteins; D008715:Methionine