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J Gen Virol 75 (1994), 239-242; DOI 10.1099/0022-1317-75-1-239
© 1994 Society for General Microbiology
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Unusual amino-terminal sequence repeat characterizes the capsid protein of dasheen mosaic potyvirus

S. S. Pappu1, H. R. Pappu1, E. P. Rybicki2 and C. L. Niblett1

1 Plant Pathology Department, University of Florida, Gainesville, Florida 32611-0680, U.S.A.
and2 Department of Microbiology, University of Cape Town, Rondebosch 7700, South Africa

The 3'-terminal region of a Florida isolate of dasheen mosaic potyvirus (DMV-LA) genome including the coat protein (CP) gene was cloned and sequenced. Protease digestion was predicted to occur between the glutamine and alanine residues at positions 79 and 80 of the 408 residue long polypeptide to produce a CP of 329 amino acids with an estimated Mr of 36229. Following the putative protease recognition site is a DAG sequence, which is conserved among aphid-transmitted potyviral CPs. There is an unusual and unique stretch of 52 amino acids after the DAG that is repetitive and rich in threonine and asparagine. A sequence of 10 residues (GNNTNTNTFormulaT) was repeated three times in tandem within this stretch and was followed by six proline residues. Several potential glycosylation sites were found clustered within this region. Expression in Escherichia coli and Western blotting of the CP confirmed its size and serological identity. Sequence comparisons and phylogenetic reconstructions indicated that DMV is a distinct potyvirus within the passionfruit woodiness virus subgroup cluster.

Received 21 May 1993; accepted 3 September 1993.




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Copyright © 1994 by the Society for General Microbiology.