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. 1984 Aug;4(8):1427–1439. doi: 10.1128/mcb.4.8.1427

Plasmid-directed synthesis of genuine adenovirus 2 early-region 1A and 1B proteins in Escherichia coli.

J L Ko, M L Harter
PMCID: PMC368931  PMID: 6092911

Abstract

The transforming region of human adenovirus 2 is located in the left 11.2% of the viral genome and is comprised of two distinct genetic units termed E1A and E1B. cDNAs containing the entire nucleotide sequence of the mature E1A 13S and E1B 22S mRNAs that are complementary to these genetic units have been introduced into bacterial plasmids a short distance downstream from the Escherichia coli lac promoter. Upon transformation into appropriate E. coli hosts, one of these plasmids, pKHAO, directed the synthesis of a 45-kilodalton (kd) protein, and the other, pKHBO, synthesized a protein of 54.9 kd. Both of these plasmid-encoded proteins constituted 0.1 to 0.3% of the total cellular protein and were virtually identical to the authentic adenovirus 2 E1A 42- to 50-kd and E1B 53- to 58-kd tumor antigens (T antigen) as determined by gel electrophoresis, immunoprecipitation, and tryptic fingerprint analysis. With the use of our pKHBO expression plasmid we were also able to demonstrate that the second AUG sequence appearing in the E1B 22S mRNA corresponded to the start of the gene encoding the large adenovirus 2 T antigen. This confirms theoretical deductions based on DNA sequencing analysis that translation of the large T antigen initiates translation at an internal ATG rather than at the 5'-proximal AUG.

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Selected References

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