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The adenovirus 5 mutant H5dl337 lacks 146 base pairs within early region 1B. The deletion removes a portion of the region encoding the E1B 21,000-molecular-weight (21K) polypeptide, but does not disturb the E1B-55K/17K coding region. The virus is slightly defective for growth in cultured HeLa cells, in which its final yield is reduced ca. 10-fold compared with wild-type virus. The mutant displays a striking phenotype in HeLa cells. The onset of cytopathic effect is dramatically accelerated, and both host cell and viral DNAs are extensively degraded late after infection. This defect has been described previously for a variety of adenovirus mutants and has been termed a cytocidal (cyt) phenotype. H5dl337 serves to map this defect to the loss of E1B-21K polypeptide function. In addition to its defect in the productive growth cycle, H5dl337 is unable to transform rat cells at normal efficiency.

Deletion of the gene encoding the adenovirus 5 early region 1b 21,000-molecular-weight polypeptide leads to degradation of viral and host cell DNA