| abstract |
(57) [Summary] An object of the present invention is to provide a modified protein, such as a modified sarcosine oxidase, capable of realizing simple measurement of flavin adenine dinucleotide. A method for modifying a protein by deleting, substituting or adding one or several amino acids in an amino acid sequence constituting a protein, comprising the steps of: A method for modifying a protein, for example, sarcosine oxidase, wherein the modification makes the expression of the activity of the protein dependent on the concentration of flavin adenine dinucleotide. |