Abstract
In this investigation, the early period of adenovirus type 2 (Ad2)-HeLa cell interaction was analyzed by electron microscopy and biochemical techniques. Events observed in this period ranged from the disappearance of virions from the cell surface to their subsequent association with the cell nucleus. Destabilization of the virions attached to the intact cell was necessary for virions to escape from intracellular vesicles. Strong temperature dependence and rapid escape from a vesicular compartment were shown in temporal kinetic experiments. These vesicles appeared to be acidic, since lysosomotropic agents partly inhibited the release of virions from vesicles. Studies of Ad2 binding to cells in buffers of different pH values suggested that adenovirus binds to cells by two different mechanisms. At low pH the binding was most probably mediated by the penton base and at neutral pH by the fiber protein. The number of receptor sites per cell was 25,000 and 6,000 at low and neutral pH, respectively. This study suggests that the low-pH affinity between the penton base and a vesicular membrane is important inside acid vesicles when Ad2 quickly enters the cytoplasm. However, a significant fraction of the virions was possibly internalized by a pathway not requiring a passage through such vesicles.
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Selected References
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