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Journal of Virology, April 2007, p. 3124-3129, Vol. 81, No. 7
0022-538X/07/$08.00+0 doi:10.1128/JVI.02177-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Division of Human Biology,1 Molecular and Cellular Biology Program,2 Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 981093
Received 4 October 2006/ Accepted 6 January 2007
Jaagsiekte sheep retrovirus (JSRV) uses hyaluronidase 2 (Hyal2) as a cell entry receptor. By making inactivating mutations to the catalytic residues of human Hyal2, we found that hyaluronidase activity was dispensable for its receptor function. The affinities of the JSRV envelope glycoprotein for Hyal2 and the Hyal2 mutant were similar, and hyaluronan did not block either high-affinity interaction or virus infection. While generating the Hyal2 mutant, we discovered that our previous analysis of the hyaluronidase activity of Hyal2 was affected by a contaminating hyaluronan lyase, which we have identified as the occlusion-derived baculovirus E66 protein of the recombinant baculovirus used to produce Hyal2. We now report that purified human Hyal2 is a weak acid-active hyaluronidase.
Published ahead of print on 17 January 2007.
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