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Journal of Virology, October 2000, p. 9601-9609, Vol. 74, No. 20
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Attenuation of Tick-Borne Encephalitis Virus by Structure-Based Site-Specific Mutagenesis of a Putative Flavivirus Receptor Binding Site

Christian W. Mandl,* Steven L. Allison, Heidemarie Holzmann, Tamara Meixner, and Franz X. Heinz

Institute of Virology, University of Vienna, A-1095 Vienna, Austria

Received 6 April 2000/Accepted 10 July 2000

The impact of a specific region of the envelope protein E of tick-borne encephalitis (TBE) virus on the biology of this virus was investigated by a site-directed mutagenesis approach. The four amino acid residues that were analyzed in detail (E308 to E311) are located on the upper-lateral surface of domain III according to the X-ray structure of the TBE virus protein E and are part of an area that is considered to be a potential receptor binding determinant of flaviviruses. Mutants containing single amino acid substitutions, as well as combinations of mutations, were constructed and analyzed for their virulence in mice, growth properties in cultured cells, and genetic stability. The most significant attenuation in mice was achieved by mutagenesis of threonine 310. Combining this mutation with deletion mutations in the 3'-noncoding region yielded mutants that were highly attenuated. The biological effects of mutation Thr 310 to Lys, however, could be reversed to a large degree by a mutation at a neighboring position (Lys 311 to Glu) that arose spontaneously during infection of a mouse. Mutagenesis of the other positions provided evidence for the functional importance of residue 308 (Asp) and its charge interaction with residue 311 (Lys), whereas residue 309 could be altered or even deleted without any notable consequences. Deletion of residue 309 was accompanied by a spontaneous second-site mutation (Phe to Tyr) at position 332, which in the three-dimensional structure of protein E is spatially close to residue 309. The information obtained in this study is relevant for the development of specific attenuated flavivirus strains that may serve as future live vaccines.

* Corresponding author. Mailing address: Institute of Virology, University of Vienna, Kinderspitalgasse 15, A-1095 Vienna, Austria. Phone: 43-1-404-90, ext. 79502. Fax: 43-1-406-21-61. E-mail: christian.mandl{at}univie.ac.at.

Journal of Virology, October 2000, p. 9601-9609, Vol. 74, No. 20
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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