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J Virol. 1977 January; 21(1): 187-198

In vitro translation with adenovirus polyribosomes.

H Persson, B Oberg and L Philipson

ABSTRACT

Polyribosomes isolated from adenovirus type 2 (Ad2)-infected HeLa cells late in productive infection can be used for translation in cell-free systems. At least eight viral polypeptides are synthesized, including the precursors to virion polypeptides VI and VII. Separation of polyribosomes by zonal rate centrifugation followed by translation in a cell-free system reveals a correlation between the sizes of the polyribosomes and the polypeptides synthesized. The cell-free extracts incorporate amino acid linearly for only 10 min and show little or no capacity to reinitiate protein synthesis. The elongation efficiency measured as the number of amino acids incorporated per ribosome in 20 min is low, ranging from 10 to 100. The maximum chain elongation rate is estimated to be 10 to 20 amino acids per min. The limited elongation has been used to assess the relative concentration of mRNA's engaged in translation.

J Virol. 1977 January; 21(1): 187-198




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