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Journal of Virology, November 2002, p. 10766-10775, Vol. 76, No. 21
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.21.10766-10775.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Complementation Analysis of the Flavivirus Kunjin NS3 and NS5 Proteins Defines the Minimal Regions Essential for Formation of a Replication Complex and Shows a Requirement of NS3 in cis for Virus Assembly{dagger}

Wen Jun Liu, Petra L. Sedlak, Natasha Kondratieva, and Alexander A. Khromykh*

Sir Albert Sakzewski Virus Research Centre, Royal Children's Hospital, and Clinical Medical Virology Centre, University of Queensland, Brisbane, Queensland 4029, Australia

Received 29 April 2002/ Accepted 22 July 2002

We have previously reported successful trans-complementation of defective Kunjin virus genomic RNAs with a range of large lethal deletions in the nonstructural genes NS1, NS3, and NS5 (A. A. Khromykh et al., J. Virol. 74:3253-3263, 2000). In this study we have mapped further the minimal region in the NS5 gene essential for efficient trans-complementation of genome-length RNAs in repBHK cells to the first 316 of the 905 codons. To allow amplification and easy detection of complemented defective RNAs with deletions apparently affecting virus assembly, we have developed a dual replicon complementation system. In this system defective replicon RNAs with a deletion(s) in the nonstructural genes also encoded the puromycin resistance gene (PAC gene) and the reporter gene for ß-galactosidase (ß-Gal). Complementation of these defective replicon RNAs in repBHK cells resulted in expression of PAC and ß-Gal which allowed establishment of cell lines stably producing replicating defective RNAs by selection with puromycin and comparison of replication efficiencies of complemented defective RNAs by ß-Gal assay. Using this system we demonstrated that deletions in the C-terminal 434 codons of NS3 (codons 178 to 611) were complemented for RNA replication, while any deletions in the first 178 codons were not. None of the genome-length RNAs containing deletions in NS3 shown to be complementable for RNA replication produced secreted defective viruses during complementation in repBHK cells. In contrast, structural proteins produced from these complemented defective RNAs were able to package helper replicon RNA. The results define minimal regions in the NS3 and NS5 genes essential for the formation of complementable replication complex and show a requirement of NS3 in cis for virus assembly.

* Corresponding author. Mailing address: Sir Albert Sakzewski Virus Research Centre, Royal Children's Hospital, Brisbane, Queensland 4029, Australia. Phone: 617 36361568. Fax: 617 36361401. E-mail: a.khromykh{at}mailbox.uq.edu.au.

{dagger} This is publication no. 145 from the Sir Albert Sakzewski Virus Research Centre.

Journal of Virology, November 2002, p. 10766-10775, Vol. 76, No. 21
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.21.10766-10775.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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