1887

Abstract

SUMMARY

The propagation of hepatitis A virus (HAV) in the cell line PLC/PRF/5 made possible the radiolabelling of mature, infectious hepatitis A virions and the determination of their physicochemical properties. In contrast to poliovirus type 2 (160S, 1.340 g/ml), HAV had a sedimentation coefficient of 156 ± 2S and a buoyant density of 1.332 g/ml in CsCl. The genome of HAV consisted of linear single-stranded RNA which sedimented at 32.5S under non-denaturing conditions. Compared to the size and sedimentation behaviour of poliovirus RNA (2.6 × 10 mol. wt., 35S) this corresponds to a mol. wt. of 2.3 × 10. Electrophoresis under fully denaturing conditions, however, revealed a mol. wt. of 2.8 × 10 and indicates the existence of relatively extended regions with secondary structure. The purified virus genome, containing a poly(A) sequence, served as a messenger for the synthesis of virus antigen in PLC/PRF/5 cells. Finally, in accordance with previous observations, the capsid of the virion was found to be constructed of three major polypeptides (VP1, 31 × 10; VP2, 26 × 10; VP3, 21 × 10 mol. wt.) and of two less readily demonstrable components probably corresponding to VP4 (8 × 10 to 10 × 10 mol. wt.) and the precursor polypeptide VP0 (40 × 10 mol. wt.).

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1981-12-01
2024-04-20
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