Kabushiki Kaisha Yakult Honsha

Mayumi Kiwaki

Tohru Iino

Takashi Asahara

Hirokazu Tsuji

Koji Nomoto

Tomoyuki Sako

Masaki Serata

Mika Miura

Kazunori Matsuda

Harue Sone

Saeko Sawaki

Hoshitaka Matsumoto

Mariko Kadota

Yukio Shirasawa

An object of the present invention is to provide a method of quantitating or detecting a microorganism, capable of detecting a live microorganism at high sensitivity and more precisely. A method of quantitating a microorganism of interest, using as an index the amount of rRNA of the microorganism of interest is provided.

Method of quantitatively analyzing microorganism targeting rRNA

Provided are a method for regulating acid resistance of a microorganism by suppressing the expression of the fadD gene therein and a screening method for a microorganism having acid resistance by using the expression level of the fadD gene as an index. A method for regulating acid resistance of a microorganism, including suppressing the expression of fadD gene present in the microorganism.

Method for regulating acid resistance of microbes

Provided is a gene that is useful for imparting hydrogen peroxide resistance to a microorganism. Also provided is a method for using the same. The hydrogen peroxide resistance-imparting gene encoding a protein selected from the following proteins (a) to (c): (a) a protein having the amino acid sequence of SEQ ID NO: 2; (b) a protein which has an amino acid sequence equivalent to the amino acid sequence of (a), except that one to several amino acid residues are deleted, substituted, or added, and which exhibits hydrogen peroxide resistance-imparting activity; and (c) a protein which has an amino acid sequence having an identity of 85% or higher to the amino acid sequence of (a), and which exhibits hydrogen peroxide resistance-imparting activity.

Hydrogen peroxide resistance-imparting gene and method for using same

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

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Kokubunji, Japan

Mayumi Kiwaki