1887

Abstract

A filamentous phage, Lf, which specifically infects pv. was isolated. The phage particle measured 1000 (±200) × 8 nm. It formed turbid plaques of about 1 mm in diameter. During multiplication, the progeny virions extruded into the medium without retarding host cell growth. Stocks were stable for 6 months at 4 °C and survived treatment at 80 °C for 10 min. Treatment with chloroform, ethanol or acetone completely destroyed infectivity; ethyl ether and methanol inactivated 98 to 99% of the phage. SDS-polyacrylamide gel electrophoresis showed a major coat protein band of approximate 4000 whereas an immunoprecipitation test detected the existence of two coat protein species. The phage genome was shown to be a single-stranded DNA molecule. A physical map was constructed and the DNA size was calculated to be 5·9 kb. Cells treated with Tris-HCl containing CaCl and polyethylene glycol 6000 were transfected by replicative form DNA at a frequency of 3·4 × 10 p.f.u./ µg.

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1990-08-01
2022-08-11
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