Published online 31 May 2006
Article |
Polyadenylation of genomic RNA and initiation of antigenomic RNA in a positive-strand RNA virus are controlled by the same cis-element
Department of Medical Microbiology Nijmegen Center for Molecular Life Science, Radboud University Nijmegen Medical Centre PO Box 9101, 6500 HB Nijmegen, The Netherlands 1 M.P. Chumakov Institute of Poliomyelitis and Viral Encephalitides, Russian Academy of Medical Sciences Moscow Region 142782, Russia 2 Moscow State University Moscow 119899, Russia 3 University of California, San Francisco, Mission Bay Genentech Hall, UCSF Department of Microbiology 600 16th Street, PO Box 2280, San Francisco, CA 94143, USA
*To whom correspondence should be addressed. Tel: +31 24 3614356; Fax: +31 24 3540216; Email: w.melchers{at}ncmls.ru.nl
Received February 2, 2006. Revised March 28, 2006. Accepted April 19, 2006.
Genomes and antigenomes of many positive-strand RNA viruses contain 3'-poly(A) and 5'-poly(U) tracts, respectively, serving as mutual templates. Mechanism(s) controlling the length of these homopolymeric stretches are not well understood. Here, we show that in coxsackievirus B3 (CVB3) and three other enteroviruses the poly(A) tract is
8090 and the poly(U) tract is
20 nt-long. Mutagenesis analysis indicate that the length of the CVB3 3'-poly(A) is determined by the oriR, a cis-element in the 3'-noncoding region of viral RNA. In contrast, while mutations of the oriR inhibit initiation of () RNA synthesis, they do not affect the 5'-poly(U) length. Poly(A)-lacking genomes are able to acquire genetically unstable AU-rich poly(A)-terminated 3'-tails, which may be generated by a mechanism distinct from the cognate viral RNA polyadenylation. The aberrant tails ensure only inefficient replication. The possibility of RNA replication independent of oriR and poly(A) demonstrate that highly debilitated viruses are able to survive by utilizing emergence, perhaps atavistic, mechanisms.
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