The dodecahedral framework of the bacteriophage phi 6 nucleocapsid is composed of protein P1

The outer layer of the bacteriophage phi 6 nucleocapsid (NC) was removed by EDTA and reassociated with the core in the presence of Ca2+ or Mg2+. The core was relatively inaccessible to trypsin digestion, was composed of protein P1, and was in the dodecahedral framework reported previously. (H.T. Steely, Jr., and D. Lang, J. Virol. 51:479-483, 1984; Y. Yang and D. Lang, J. Virol. 51:484-488, 1984). The double-stranded RNA genome became RNase sensitive after EDTA treatment of the nucleocapsid.