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. 1987 Jul;6(7):2037–2044. doi: 10.1002/j.1460-2075.1987.tb02468.x

A novel adenovirus-2 E1A mRNA encoding a protein with transcription activation properties.

P J Ulfendahl 1, S Linder 1, J P Kreivi 1, K Nordqvist 1, C Sevensson 1, H Hultberg 1, G Akusjärvi 1
PMCID: PMC553593  PMID: 2958277

Abstract

Two novel adenovirus-2 early region 1A mRNAs, designated 10S and 11S, have been characterized. They differ from the previously described 9S, 12S and 13S mRNAs by having an additional intron removed during mRNA maturation. The 10S and 11S mRNAs encode proteins with mol. wts of 30 and 35 kd. These proteins are encoded in the same translational reading frame as the 12S and 13S mRNA products and differ by lacking 72 amino acids between position 27 and 98. A functional analysis showed that both the 10S and 11S mRNA products are non-essential for lytic virus growth, and, furthermore, defective in cellular transformation. Interestingly the 11S mRNA product functioned as an efficient transcriptional activator in transient expression assays but was very ineffective as a gene activator during virus growth. Moreover, the virus expressing the 11S cDNA failed to block host cell gene expression although substantial amounts of late proteins were expressed. From the biological properties of the E1A cDNA mutants it was possible to localize two functional domains in the E1A proteins; one region required for transcriptional activation (amino acids 140-185), and a second domain required for adenovirus transformation and the control of viral and cellular gene expression during a lytic infection (amino acids 27-98).

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