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Restrictive infection of Bacillus subtilis by suppressor-sensitive (sus) mutants of phi 29 has been used to search for cistrons that function in viral assembly. The products of cistrons 7, 9, 10, and 16 are necessary for head morphogenesis. The neck upper collar protein P10 and the tail protein P9 must be present for DNA packaging to occur. The protein P7 must be present for phage-related particles to form. A prohead-like particle has been isolated during 16-restrictive infection. The particle is composed of the proteins Hd, P10, F, and P7. P16 must function for DNA-filled particles to accumulate. A DNA-containing particle produced in the absence of the cistron 11 product may be an intermediate in the phi 29 assembly pathway. The protein P13 interacts with P9 and P11 to form a stable DNA-filled particle. The products of cistrons 2 and 3 are essential for viral DNA synthesis, and in their absence virus-related particles are not detected.

Analysis of gene function of bacteriophage phi 29 of Bacillus subtilis: identification of cistrons essential for viral assembly