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Journal of Virology, June 1999, p. 5240-5243, Vol. 73, No. 6
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Influenza A Virus RNA Polymerase Has the Ability To Stutter at the Polyadenylation Site of a Viral RNA Template during RNA Replication

Hongyong Zheng, Hye Annie Lee, Peter Palese, and Adolfo García-Sastre*

Department of Microbiology, Mount Sinai School of Medicine, New York, New York 10029

Received 4 December 1998/Accepted 18 March 1999

The viral polymerase of influenza virus, a negative-strand RNA virus, is believed to polyadenylate the mRNAs by stuttering at a stretch of five to seven uridine residues which are located close to the 5' ends of the viral RNA templates. However, a mechanism of polyadenylation based on a template-independent synthesis of the poly(A) tail has not been excluded. In this report, we present new evidence showing the inherent ability of the viral polymerase to stutter at the poly(U) stretch of a viral RNA template during RNA replication. Variants which possess 1- to 13-nucleotide-long insertions at the poly(U) stretch have been identified. These results support a stuttering mechanism for the polyadenylation of influenza virus mRNAs.

* Corresponding author. Mailing address: Department of Microbiology, Box 1124, Mount Sinai School of Medicine, 1 Gustave L. Levy Place, New York, NY 10029. Phone: (212) 241-7769. Fax: (212) 534-1684. E-mail: agarcia{at}smtplink.mssm.edu.

Journal of Virology, June 1999, p. 5240-5243, Vol. 73, No. 6
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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Copyright © 1999 by the American Society for Microbiology. All rights reserved.