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1 Institute of Virology, University of Würzburg, Versbacher Strasse 7, 8700 Würzburg
and2 Institute of Virology, University of Würzburg, Versbacher Strasse 7, 8700 Würzburg, Germany
We have expressed the murine coronavirus haemagglutinin-esterase protein in a vaccinia virus/T7 RNA polymerase system. The levels of expression observed are significantly higher than those found in virus-infected cells. The expressed protein has both receptor-destroying (esterase) and receptor-binding (haemad-sorption) activities. The use of this system will greatly facilitate analysis of the structure-function relationships of this protein.
Present address: Immuno Research Centre, Uferstrasse 15, 2304 Orth/Donau, Austria.
> Present address: Department of Pathology, Immunology Division, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, U.K.
Received 4 December 1990;
accepted 13 February 1991.
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