Tetrahydrofolate synthetase gene
By finding a novel tetrahydrofolate synthetase gene and a protein encoded by said gene, a method for identifying a compound which inhibits cell growth accelerating activity of said protein is provided, and a judging method, a preventing method and a treating method of colon cancer are provided. A DNA comprising a nucleotide sequence of from the 94th to 2934th positions of the nucleotide sequence of SEQ ID NO:1 of the SEQUENCE LISTING; a polynucleotide which specifically hybridizes with said DNA; a protein encoded by said DNA; a recombinant vector comprising said DNA; a transformant comprising said recombinant vector; an antibody for said protein; a method for producing said protein; a method for identifying a compound which inhibits cell growth accelerating activity possessed by said protein; a method for judging colon cancer, characterizing in that expressed amount of said DNA is measured; a kit for judging colon cancer; a preventive agent and/or therapeutic agent for colon cancer.
1. A method for identifying a compound that inhibits the cell growth accelerating activity of a tetrahydrofolate synthetase protein, wherein said protein comprises residues 1-978 of SEQ ID NO: 2, or comprises residues 32-978 of SEQ ID NO: 2, wherein said method comprises the steps of comprising:
(i) contacting a cell expressing said protein with a test compound under conditions which permit interaction between said protein and said test compound;
(ii) culturing said cell and determining the growth rate of said cell during said culturing; and
(iii) determining that the test compound inhibits the cell growth accelerating activity of said protein when the growth rate of said cell in the presence of said test compound is reduced in comparison to the growth rate of the cell in the absence of said test compound.
2. The method according to claim 1 , wherein the growth rate of said cell is determined by
counting the number of grown cells after the culturing.