Abstract: Disclosed are peptides represented by IVC1SLC2SC3TAW and C1SLC2SC3 wherein I stands for isoleucine, V for valine, C1 for cysteine, C2 for cysteinesulfinic acid, C3 for cysteinesulfenic acid, S for serine, L for leucine, T for threonine, A for alanine, and W for tryptophan. These peptides can impart photoreactivity to a protein by binding to a non-heme iron. Also disclosed are methods for imparting photoreactivity to cells by introducing the peptide sequences into at least one protein which is involved in a metabolic system and/or energy metabolic system of the cells. There can be provided peptide sequences with a shorter peptide chain capable of imparting photoreactivity, which can be easily introduced into a protein with a little risk in degrading original function of the protein. There are also provided methods enabling control of metabolic reactions by imparting photoreactivity to cells with the peptides.

Abstract: Disclosed are peptides represented by IVC1SLC2SC3TAW and C1SLC2SC3 wherein I stands for isoleucine, V for valine, C1 for cysteine, C2 for cysteinesulfinic acid, C3 for cysteinesulfenic acid, S for serine, L for leucine, T for threonine, A for alanine, and W for tryptophan. These peptides can impart photoreactivity to a protein by binding to a non-heme iron. Also disclosed are methods for imparting photoreactivity to cells by introducing the peptide sequences into at least one protein which is involved in a metabolic system and/or energy metabolic system of the cells. There can be provided peptide sequences with a shorter peptide chain capable of imparting photoreactivity, which can be easily introduced into a protein with a little risk in degrading original function of the protein. There are also provided methods enabling control of metabolic reactions by imparting photoreactivity to cells with the peptides.

Abstract: There is disclosed a method for producing nitrile hydratase comprising culturing a transformant cell which is obtained by transforming a host cell of bacterium not belonging to the genus Rhodococcus with a vector (1) which contains a nucleotide sequence encoding at least the &agr; a chain and the &bgr; chain of nitrile hydratase, or the vector (1) and a vector (2) which contains a nucleotide sequence encoding at least the &bgr; chain of the nitrile hydratase, and collecting produced nitrile hydratase, wherein the culture of the transformant cell is performed at a temperature of 35° C. or less.

Abstract: Disclosed are peptides represented by IVC1SLC2SC3TAW and C1SLC2SC3 wherein I stands for isoleucine, V for valine, C1 for cysteine, C2 for cysteinesulfinic acid, C3 for cysteinesulfenic acid, S for serine, L for leucine, T for threonine, A for alanine, and W for tryptophan. These peptides can impart photoreactivity to a protein by binding to a non-heme iron. Also disclosed are methods for imparting photoreactivity to cells by introducing the peptide sequences into at least one protein which is involved in a metabolic system and/or energy metabolic system of the cells. There can be provided peptide sequences with a shorter peptide chain capable of imparting photoreactivity, which can be easily introduced into a protein with a little risk in degrading original function of the protein. There are also provided methods enabling control of metabolic reactions by imparting photoreactivity to cells with the peptides.