Hiroshima University

Ryuichi Hirota

Akio Kuroda

Takenori Ishida

Kei Motomura

It is an object of an aspect of the present invention to provide (i) transformants, whose proliferation depends on phosphite, of various species of organism and (ii) a method for detecting the presence of a reduced phosphorous compound with use of such a transformant. Use is made of a transformant which is defective in functions of a gene encoding a phosphate transporter protein and a gene encoding a phosphate ester transporter protein and into which a gene encoding a hypophosphite transporter protein is introduced, a signal peptide of a hypophosphite binding protein being substituted with a signal peptide derived from a host or a species of organism closely related to the host.

Transformant, and method using said transformant to detect presence or absence of reduced phosphorous compound

In order to provide a transformant by which a high containment effect is obtained and which can be prepared by a simple procedure, a method for producing the transformant, and a method for detecting the presence of a reduced phosphorous compound with use of the transformant, a transformant in accordance with an embodiment of the present invention is a transformant which is defective in functions of a gene encoding a phosphate transporter protein and a gene encoding a phosphate ester transporter protein and into which a gene encoding a hypophosphite transporter protein is introduced.

Transformant, method for producing transformant, and method for detecting presence or absence of reduced phosphorus compound using transformant

A simple and inexpensive method for selectively culturing a microorganism which method makes it possible to selectively culture a microorganism of interest even without using a sterilization operation or an antibiotic substance is provided. The method according to the present invention selectively culturing a microorganism includes the step of culturing, in a culture medium containing phosphorous acid as a sole phosphorous source, a recombinant microorganism into which a phosphite dehydrogenase gene has been introduced.

Method for selectively culturing microorganism using phosphite dehydrogenase gene as marker

In order to provide: a phosphite dehydrogenase protein having both improved solubility and improved heat stability; a method for producing a gene encoding the phosphite dehydrogenase protein; a method for producing the phosphite dehydrogenase protein; and use of the phosphite dehydrogenase protein, (i) a phosphite dehydrogenase protein having a specific amino acid sequence and (ii) a gene encoding the phosphite dehydrogenase protein are used.

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Hiroshima, Japan

Ryuichi Hirota