1887

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Volume 81, Issue 3

Detection of beet yellows closterovirus methyltransferase-like and helicase-like proteins using monoclonal antibodies Free

Abstract

In the positive-stranded RNA genome of beet yellows closterovirus (BYV), the 5′-terminal ORF 1a encodes a 295 kDa polyprotein with the domains of papain-like cysteine proteinase, methyltransferase (MT) and helicase (HEL), whereas ORF 1b encodes an RNA-dependent RNA polymerase. Eleven and five hybridoma cell lines secreting monoclonal antibodies (MAbs) were derived from mice injected with the bacterially expressed fragments of the BYV 1a product encompassing the MT and HEL domains, respectively. On immunoblots of protein from BYV-infected plants, four MAbs against the MT recognized a ∼63 kDa protein, and two MAbs against the HEL recognized a ∼100 kDa protein. Both the methyltransferase-like protein and the helicase-like protein were found mainly in the fractions of large organelles (P1) and membranes (P30) of the infected plants. These data clearly indicate that (i) the BYV methyltransferase-like and helicase-like proteins, like other related viral enzymes, are associated with membrane compartments in cells, and (ii) the 1a protein, apart from the cleavage by the leader papain-like proteinase that is expected to produce the 66 kDa and 229 kDa fragments, undergoes additional processing by a virus-encoded or cellular proteinase.

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© Microbiology Society
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2000-03-01
2024-04-24
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Detection of beet yellows closterovirus methyltransferase-like and helicase-like proteins in vivo using monoclonal antibodies
J. Gen. Virol. 81, 597 (2000); https://doi.org/10.1099/0022-1317-81-3-597
/content/journal/jgv/10.1099/0022-1317-81-3-597
/content/journal/jgv/10.1099/0022-1317-81-3-597
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