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Complementation analysis assigned the mutations of strains H5ts115 and H5ts116, two hexon-minus mutants, to the 100,000-dalton (100K) protein gene. Heterotypic marker rescue (i.e., type 5 adenovirus [Ad5] temperature-sensitive mutants DNA X EcoRI restriction fragments of Ad2 DNA) confirmed the results of previous marker rescue mapping studies, and the heterotypic recombinants yielded unique hybrid (Ad5-Ad2) 100K proteins which were intermediate in size between Ad5 and Ad2 proteins and appeared to be as functionally active as the wild-type 100K protein. Phenotypic characterization of these mutants showed that both the hexon polypeptides and the 100K polypeptides were unstable at the nonpermissive temperature, whereas fiber and penton were not degraded, and that the 100K protein made at 39.5 degrees C could not be utilized after a shift to the permissive temperature (32 degrees C). The role of the 100K protein in the assembly of the hexon trimer was also examined by in vitro protein synthesis. Normally, hexon polypeptides synthesized during an in vitro reaction are assembled into immunoreactive hexons. However, this assembly was inhibited by preincubation of the cell extract with anti-100K immunoglobulin G; neither anti-fiber immunoglobulin G nor normal rabbit immunoglobulin G inhibited hexon assembly. It is postulated that an interaction between the 100K protein and hexon polypeptides is required for effective assembly of hexon trimers.

Characterization of two temperature-sensitive mutants of type 5 adenovirus with mutations in the 100,000-dalton protein gene