title: Cloning of bacteriophage T5 DNA fragments. II. Isolation of recombinants carrying T5 PstI fragments.
abstract: The adjacent PstI-J, I and G fragments of the phage T5 DNA molecule (4.4, 4.6 and 7.2 kb, respectively) have been cloned in plasmid pBR322 and their locations verified by Southern blot analysis. The PstI I and G fragments overlap the previously cloned HindIII-P and G fragments and like those, contain no known genetic markers. In addition, one of the 12 newly isolated T5 mutants maps in this PstI-IG region. Thus, the size of the "empty" region between genes D15 and D17, which we have previously observed on the genetic map, extends to at least 11.8 kb. In contrast, the PstI-J fragment carried part of the D12 gene and the intact D14 and D15 genes. This clone is of particular interest since the D15 gene product is a nuclease and is responsible for the positive control of late gene transcription. The orientation of these genes relative to the T5 DNA molecule has been determined by a combination of restriction, deletion and complementation analyses.
mesh_terms: D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant / Q000378:metabolism; D004279:DNA, Viral / Q000235:genetics*; D015252:Deoxyribonucleases, Type II Site-Specific; D004926:Escherichia coli / Q000235:genetics; D005814:Genes, Viral; D005816:Genetic Complementation Test; D010957:Plasmids; D013604:T-Phages / Q000235:genetics*
chemical_list: D004274:DNA, Recombinant; D004279:DNA, Viral; D004262:DNA Restriction Enzymes; C024388:CTGCAG-specific type II deoxyribonucleases; D015252:Deoxyribonucleases, Type II Site-Specific