title: Identification and sequence determination of the host factor gene for bacteriophage Q beta.
abstract: The host factor (HF-I) required for phage Q beta RNA-directed synthesis of complementary minus-strand RNA was purified to homogeneity from phage-infected Escherichia coli cells. The hfq gene encoding HF-I was cloned using synthetic probes designed based on the partial amino acid sequence of HF-I, and mapped at 94.8 min on the E. coli chromosome downstream of the miaA gene involved in 2-methylthio-N6-(isopentyl)-adenosine (ms2i6A) tRNA modification. Sequence determination of the cloned hfq gene indicated that HF-I is a small protein of Mr 11,166 consisting of 102 amino acid residues.
authors.affiliation: Department of Molecular Genetics, National Institute of Genetics, Shizuoka, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kajitani
authors.forename: A
authors.initials: A
authors.lastname: Ishihama
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics* / Q000302:isolation & purification; D003001:Cloning, Molecular; D003090:Coliphages / Q000235:genetics*; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000302:isolation & purification; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D035001:Host Factor 1 Protein; D034982:Integration Host Factors; D008969:Molecular Sequence Data; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid
chemical_list: D002352:Carrier Proteins; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; D035001:Host Factor 1 Protein; D034982:Integration Host Factors; C440502:integration host factor, E coli