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Comparison of adenoviral hexon polypeptides (monomers) and of native hexons (trimers) by SDS-polyacrylamide gel electrophoresis.

Purified hexons of 27 serotypes of human, simian, bovine and avian adenoviruses were analysed by SDS-PAGE. The apparent molecular weights of hexon polypeptides calculated by comparison with 5 non-hexon and 3 sequenced hexon polypeptide markers ranged from 98 kDa (for bovine adenovirus Ad bos7) to 118 kDa (for simian adenovirus Ad sim13; SV36). A stability of native hexon capsomers (trimers) in SDS at room temperature permitted us to resolve native (trimeric) hexon by SDS-PAGE and to distinguish them from denatured (monomeric) hexon polypeptides by electrophoretic mobilities. Hexon trimer bands with slow mobility in SDS-PAGE (unlike hexon monomer polypeptide bands) retained native hexon antigenicity as revealed by immunoblot analyses. Possible applications of simultaneous analyses of hexon trimers and monomers by SDS-PAGE are discussed.