title: Bacillus subtilis DNA polymerase III is required for the replication of DNA of bacteriophages SPP-1 and phi 105.
abstract: The replication of the Bacillus subtilis bacteriophages SPP-1 and phi 105 is sensitive to 6-(p-hydroxyphenylazo)-uracil (HPUra), a selective inhibitor of replicative DNA synthesis of B. subtilis which acts specifically at the levels of a replication-specific polymerase, DNA polymerase III (pol III). The origin of the HPUra-sensitive polymerase required for phage replication was examined by comparison of the drug sensitivity of phage development in a normosensitive host with that in a host carrying azp-12, a polC mutation that specifies production of an HPUra-resistant pol III. azp-12 specified HPUra-resistant phage host pol III. The host polIII requirement for SPP-1 replication also was confirmed by the demonstration that phage development was temperature sensitive in a host mutant carrying the polC mutation mut-1 (ts). Examination of the pol III activity of crude and purified cell-free preparations derived from phage-infected cells did not indicate any detectable changes in the specific activity, purification behavior, or drug sensitivity of the enzyme.
mesh_terms: D001412:Bacillus subtilis / Q000201:enzymology; D001435:Bacteriophages / Q000254:growth & development / Q000378:metabolism*; D004258:DNA Polymerase III / Q000378:metabolism*; D004261:DNA Replication / Q000187:drug effects; D004279:DNA, Viral / Q000096:biosynthesis*; D004259:DNA-Directed DNA Polymerase / Q000378:metabolism*; D006906:Hydroxyphenylazouracil / Q000494:pharmacology; D009154:Mutation; D013696:Temperature; D014779:Virus Replication / Q000187:drug effects
chemical_list: D004279:DNA, Viral; D006906:Hydroxyphenylazouracil; D004258:DNA Polymerase III; D004259:DNA-Directed DNA Polymerase