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J. Virol., Apr 1995, 2119-2125, Vol 69, No. 4
Copyright © 1995, American Society for Microbiology

An immunoblot assay reveals that bacteriophage T4 thymidylate synthase and dihydrofolate reductase are not virion proteins

X Chen, CK Mathews, LJ Wheeler, G Maley, F Maley and DH Coombs
Department of Biology, University of New Brunswick, Fredericton, Canada.

Numerous reports describe the phage T4 enzymes thymidylate synthase and dihydrofolate reductase as structural components of the baseplate. However, Y. Wang and C. K. Mathews (J. Virol. 63:4736-4743, 1989) reported that antisera against the respective recombinant enzymes failed to neutralize phage infectivity, in contrast to previous results. Moreover, a deletion mutant lacking the genes for these two enzymes adsorbed normally to host cells. Since these findings tended to undermine the idea of the two enzymes as structural proteins, we developed a quantitative immunoblot assay to resolve the issue directly. Our results show that both enzymes are present only as minor contaminants (< 0.05 copy per phage) and as such cannot be bona fide structural proteins.

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