Kabushiki Kaisha Yakult Honsha

Saeko Sawaki

Tomoyuki Sako

Masahiko Mutai

Mayumi Kiwaki

Toshizo Sakurai

Harue Sone

Mariko Kadota

Isamu Kondo

Yukio Shirasawa

Methods for transferring a foreign gene into a host chromosome by integrating the foreign gene into a vector by utilizing a lysogenic phage, for the purpose of deleting unnecessary genes derived from the vector, except for the foreign gene. One method comprises (a) preparing a vector with a lysogenic phage integration site (such as an attP site) arranged between a first partial sequence of the objective foreign gene to be transferred, but lacking one terminal region thereof and a second partial sequence of the gene, but lacking the other terminal region, the second partial sequence having an overlapping region with a portion of the first partial sequence; (b) integrating the vector obtained in step (a) into the host chromosome; and (c) screening from among the recombinants obtained in step (b) a recombinant from which unnecessary genes originating in the vector have been deleted owing to the homologous recombination mechanism functioning in the overlapping region between the first and second partial sequences.

Methods for transferring gene into chromosome

Novel coliform bacillus useful for industrial production of staphylokinase, a fibrinolytic enzyme, and process for the production of staphylokinase using said microbe are provided. The novel microbe comprises a recombinant DNA, carrying genetic information for the production of staphylokinase, said genetic information being DNA derived from a temperate phage DNA of Staphylococcus aureus.

Coliform bacillus having a gene for the production of staphylokinase and

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Tokyo, Japan

Saeko Sawaki