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. 1984 Aug;51(2):283–297. doi: 10.1128/jvi.51.2.283-297.1984

Organization of RNA transcripts from a vaccinia virus early gene cluster.

J R Morgan, B E Roberts
PMCID: PMC254437  PMID: 6086946

Abstract

The detailed organization of the RNAs transcribed from an early gene cluster encoded by vaccinia virus has been determined from the information derived from several complementary techniques. These include hybrid selection coupled with cell-free translation to locate DNA sequences complementary to mRNAs encoding specific polypeptides; RNA filter hybridization to size and locate on the DNA mature RNAs as well as higher-molecular-weight RNAs; S1 nuclease mapping to precisely locate the 5' and 3' ends of the RNAs; S1 nuclease mapping to precisely locate the 5' and 3' ends of the RNAs; and fractionation of hybrid-selected mRNAs in an agarose gel containing methyl mercury hydroxide followed by the cell-free translation of these mRNAs to definitively ascertain the size of the mRNA encoding each polypeptide. The early gene cluster is located between 21 and 26 kilobases from the left end of the vaccinia virus genome and is encoded by a 5.0-kilobase EcoRI fragment which spans the HindIII-N, -M, and -K fragments. Transcribed towards the left terminus are four mature mRNAs, 1,450, 950, 780, and 400 nucleotides in size, encoding polypeptides of 55, 30, 20, and 10 kilodaltons, respectively. These mRNAs are colinear with the DNA template and are closely spaced such that the 5' terminus of one mRNA is within 50 base pairs of the 3' terminus of the adjacent RNA. In addition to the mature size mRNAs, there are higher-molecular-weight RNAs, 5,000, 3,300, 2,350, 2,300, 1,800, 1,700, and 1,350 nucleotides in size. The 5' and 3' termini of the high-molecular-weight RNAs are coterminal with the 5' and 3' termini of the mature size mRNA. The implications of this arrangement and the biogenesis of these early mRNAs are discussed.

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