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Separation and characterization of herpes simplex virus type 1 immediate-early mRNA's.

ABSTRACT

Polyadenylated immediate-early transcripts of herpes simplex virus type 1, made in BHK cells infected and maintained in the presence of cycloheximide, have been separated on denaturing agarose gels containing methyl mercuric hydroxide. Three virus-specific mRNA bands of estimated sizes 4.7, 3.0, and 2.0 kilobases (kb) were detected, and these mRNA's were mapped on the virus genome and also used to direct protein synthesis in vitro. The 4.7- and 3.0-kb mRNA's hybridized predominantly to certain DNA fragments which are located in the short and long repetitive regions of the genome, respectively, whereas the 2.0-kb mRNA's mapped to three discrete regions of the virus DNA. In vitro translation of these separated mRNA size classes indicated that the 3.0-kb mRNA specified the synthesis of virus polypeptide Vmw 110, whereas the 2.0-kb mRNA's specified Vmw 68, 63, and 12. The synthesis of small amounts of Vmw 175 was specified by the 4.7-kb mRNA. In contrast with the mRNA's which specify these other immediate-early polypeptides, that specifying Vmw 12 is much larger than required for its coding sequences.

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