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2007 ; 81
(2
): 743-9
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gab.com Text
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English Wikipedia
Borna disease virus matrix protein is an integral component of the viral
ribonucleoprotein complex that does not interfere with polymerase activity
#MMPMID17079312
Chase G
; Mayer D
; Hildebrand A
; Frank R
; Hayashi Y
; Tomonaga K
; Schwemmle M
J Virol
2007[Jan]; 81
(2
): 743-9
PMID17079312
show ga
We have recently shown that the matrix protein M of Borna disease virus (BDV)
copurifies with the affinity-purified nucleoprotein (N) from BDV-infected cells,
suggesting that M is an integral component of the viral ribonucleoprotein complex
(RNP). However, further studies were hampered by the lack of appropriate tools.
Here we generated an M-specific rabbit polyclonal antiserum to investigate the
intracellular distribution of M as well as its colocalization with other viral
proteins in BDV-infected cells. Immunofluorescence analysis revealed that M is
located both in the cytoplasm and in nuclear punctate structures typical for BDV
infection. Colocalization studies indicated an association of M with nucleocapsid
proteins in these nuclear punctate structures. In situ hybridization analysis
revealed that M also colocalizes with the viral genome, implying that M
associates directly with viral RNPs. Biochemical studies demonstrated that M
binds specifically to the phosphoprotein P but not to N. Binding of M to P
involves the N terminus of P and is independent of the ability of P to
oligomerize. Surprisingly, despite P-M complex formation, BDV polymerase activity
was not inhibited but rather slightly elevated by M, as revealed in a
minireplicon assay. Thus, unlike M proteins of other negative-strand RNA viruses,
BDV-M seems to be an integral component of the RNPs without interfering with the
viral polymerase activity. We propose that this unique feature of BDV-M is a
prerequisite for the establishment of BDV persistence.