Physicochemical properties of potato virus M

Potato virus M (PVM), a member of the carlavirus group was found to have a sedimentation coefficient ( S 20,w ) of 157 S, a buoyant density in CsCl of 1.322 g·cm −3 , an extinction coefficient, at 260 nm, of 2.88 cm 2 ·mg −1 , and a nucleic acid content of 6.0%. The PVM genome is a polyadenylate-containing single-stranded RNA with a molecular weight (MW) of 2.5 × 10 6 . Virus-specific, double-stranded RNA is consistently associated with PVM infection. PVM possesses a single capsid polypeptide with a MW of 35.7 × 10 3 .