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Nucleic Acids Research, 1991, Vol. 19, No. 5 1063-1066
© 1991

MOLECULAR BIOLOGY

Identification and sequence determination of the host factor gene for bacteriophage Qß

Massayuki Kajitani1,2 and Akira Ishihama1,*

1Department of Molecular Genetics, National lnstitute of Genetics Mishima, Shizuoka 411 2Basic Research Laboratories, Toray Industries, Inc., Kamakura, Kanagawa 248, Japan

* To whom correspondence should be addressed

Received December 7, 1990. Revised February 5, 1991. Accepted February 5, 1991.

The host factor (HF-l) required for phage Qß RNA-directed synthesis of complementary minus-strand RNA was purified to homogeneity from phage-infected Escherichia coil cells. The hfq gene encoding HF-l was cloned using synthetic probes designed based on the partial amino acid sequence of HF-l, and mapped at 94.8 mln on the E. coil chromosome downstream of the miaA gene involved in 2-methylthlo-N6-(isopentyl) adenosine (ms2i6A) tRNA modification. Sequence determination of the cloned hfq gene Indicated that HF-l is a small protein of Mr 11, 166 consisting of 102 amino acid residues.


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