title: Cloning and expression in Escherichia coli of the gene coding for the protein linked to the ends of Bacillus subtilis phage phi 29 DNA.
abstract: A phi 29 DNA fragment containing gene 3, coding for the 5'-terminal protein, and several other early genes has been cloned in a pBR322 derivative plasmid (pKC30) under the control of the pL promoter of bacteriophage lambda. Four polypeptides of Mr 27000, 18500, 17500 and 12500 were labelled with [35S]methionine after heat induction, accounting for about 15% of the de novo synthesized protein. The Mr 27000 and 12500 proteins were characterized as p3, the 5'-terminal protein, and p4, involved in the control of late transcription, respectively. Protein p3 synthesized in Escherichia coli was active in the in vitro formation of the initiation complex p3-dAMP when supplemented with extracts from Bacillus subtilis infected with a sus3 mutant.
mesh_terms: D001412:Bacillus subtilis / Q000235:genetics*; D001435:Bacteriophages / Q000235:genetics*; D003001:Cloning, Molecular; D004265:DNA Helicases / Q000235:genetics* / Q000302:isolation & purification; D004279:DNA, Viral / Q000235:genetics*; D004268:DNA-Binding Proteins; D005796:Genes; D005798:Genes, Bacterial; D005814:Genes, Viral; D008970:Molecular Weight; D010957:Plasmids; D014764:Viral Proteins / Q000235:genetics* / Q000302:isolation & purification
chemical_list: D004279:DNA, Viral; D004268:DNA-Binding Proteins; D014764:Viral Proteins; D004265:DNA Helicases