抄録
Bovine parainfluenza virus type 3 (PIV-3) has a buoyant density of 1.197. The RNA of PIV-3, like that of Sendai virus, is a single continuous chain which lacks polyadenylic acid sequences and tends to self-anneal to a marked extent. It has a sedimentation coefficient of 42S and a molecular weight of 4.5 × 106, being slightly smaller than Sendai virus RNA (47S, 5.3 ×106).
PIV-3 has 5 main structural proteins, of which 2 are glycoproteins. The molecular weights of protein1, protein2, protein3, glycoprotein1, and glycoprotein2 were estimated to be 79, 000, 68, 000, 35, 000, 69, 000, and 55, 000, respectively. Protein2 was suggested to be nucleocapsid protein.
