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Journal of Virology, October 2007, p. 11520-11525, Vol. 81, No. 20
0022-538X/07/$08.00+0 doi:10.1128/JVI.01308-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Interdisciplinary Program in Immunology,1 Department of Microbiology, University of Iowa, Iowa City, Iowa,2 Department of Microbiology and Immunology, Loyola University Medical Center, Maywood, Illinois3
Received 14 June 2007/ Accepted 23 July 2007
Severe acute respiratory syndrome coronavirus encodes several accessory proteins of unknown function. We previously showed that one such protein, encoded by ORF6, enhanced the growth of mouse hepatitis virus in tissue culture cells and in mice. Protein 6 consists of an N-terminal hydrophobic peptide and a C-terminal region containing intracellular protein sorting motifs. Herein, we show that mutation of the hydrophobic region but not the sorting motifs affected the ability of protein 6 to enhance virus growth. Collectively, these results support the notion that the 6 protein interacts with membrane-bound viral replication or assembly machinery to directly enhance virus replication and virulence in animals.
Published ahead of print on 1 August 2007.
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