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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1981 May;78(5):2927–2931. doi: 10.1073/pnas.78.5.2927

Eukaryotic translational control: adeno-associated virus protein synthesis is affected by a mutation in the adenovirus DNA-binding protein.

F T Jay, C A Laughlin, B J Carter
PMCID: PMC319472  PMID: 6265925

Abstract

Growth of adeno-associated virus (AAV) requires expression of certain adenovirus (Ad) genes in the same cell. AAV particles contain three proteins, VP1 (Mr 85,700), VP2 (Mr 72,000), and VP3 (Mr 61,500). These proteins have overlapping peptide maps. We recently reported that AAV RNAs make up a 3'-coterminal family of overlapping molecules. We report here that the most abundant AAV mRNA, a 2.3-kilobase spliced RNA, codes for all three proteins--VP1, VP2, and VP3--when translated in an in vitro reticulocyte lysate. This shows that the AAV capsid proteins are coded by the genome sequence between map positions 48.0 and 96.0 (1 map unit is 1% of the genome or 47 base pairs). When AAV was grown in human KB cells with the Ad temperature-sensitive mutant Ad5ts125 at the nonpermissive temperature (40 degrees C), the accumulation in vivo of AAV capsid proteins VP1, VP2, and VP3 was decreased to less than 1/50th. However, normal amounts of the 2.3-kilobase mRNA were accumulated, and this RNA could be efficiently translated in an in vitro reticulocyte lysate system to yield VP1, VP2, and VP3. These experiments suggest that in infected cells control is exerted upon the AAV 2.3-kilobase mRNA at the translational level and that this control can be influenced by mutations in Ad. These Ad mutations map in the region 2 early gene for the Ad DNA-binding protein. The temperature-sensitive system that we have studied may be useful for analysis of translational control of a eukaryotic mRNA.

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