Nucleic Acids Research, 1990, Vol. 18, No. 18 5347-5351
© 1990
MOLECULAR BIOLOGY |
IPTG-dependent vaccinia virus: identification of a virus protein enabling virion envelopment by Golgi membrane and egress
Sir William Dunn School of Pathology, University of Oxford South Parks Road, Oxford 0X1 3RE, UK
*To whom correspondence should be addressed
Received July 30, 1990. Revised August 20, 1990. Accepted August 20, 1990.
A novel method has been developed to study the functional roles of Individual vaccinia virus gene products that is neither limited by the possible essentiality of the target gene nor by the availability of conditional lethal mutants. The system utilises the E.coli lac repressor protein, the operator sequence to which it binds and the specific inducer IPTG. It allows the generation of recombinant viruses in which the expression of any chosen gene, and hence virus replication, can be externally controlled. In principle, this system is broadly applicable to the functional analysis of genes in any large DNA virus. This approach has demonstrated that the gene encoding the 14 kDa membrane protein of vaccinia virus is non-essential for the production of infectious intracellular virus particles, but essential for the envelopment of intracellular virions by Golgi membrane and for egress of mature extracellular viral particles. This is the first vaccinia virus protein shown to be specifically required for these processes. In vivothis system may prove useful as a means of attenuating recombinant vaccinia virus vaccines by preventing virus spread without reducing the amount of the foreign antigen expressed in each infected cell. Attenuation of other live virus vaccines may be developed in a similar way.
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