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J Virol. 1985 June; 54(3): 856-859

Trypsin sensitivity of the Sabin strain of type 1 poliovirus: cleavage sites in virions and related particles.

ABSTRACT

Treatment of the Sabin strain of type 1 poliovirus with trypsin produced two stable fragments of capsid protein VP1 which remained associated with the virions. Trypsinized virus was fully infectious and was neutralized by type-specific antisera. The susceptible site in the Sabin 1 strain was between the lysine at position 99 and the asparagine at position 100. A similar tryptic cleavage occurred in the Leon and Sabin strains of type 3 poliovirus, probably at the arginine at position 100, but not in the type 1 Mahoney strain, which lacks a basic residue at either position 99 or position 100. Tryptic treatment of heat-treated virus and 14S assembly intermediates produced unique stable fragments which were different from those produced in virions. The implications of our results for future characterization of the surface structures of these particles and structural rearrangements in the poliovirus capsid are discussed.

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