Visible light-inducible photolyase gene from the goldfish Carassius auratus.
By introducing and expressing a cDNA library constructed from mRNA of the cultured goldfish Carassius auratus cells in Escherichia coli, a gene encoding photolyase of the vertebrate was isolated, the first example from metazoa. The amino acid sequence deduced from the nucleotide sequence differs significantly from those of microorganisms. Five out of 6 tryptophan residues strictly conserved in photolyases from microorganisms and thought to play important roles in DNA and chromophore binding of the enzyme are substituted by other residues of different characteristics. By Northern analysis the expression of the photolyase gene was found to be induced more than 10 times by exposure of the cells to visible light. These results indicate a unique evolution of the photolyase gene and a novel mechanism of gene regulation, in which visible light triggers the production of the light-dependent enzyme for repair of DNA damages induced by harmful ultraviolet part of sunlight.
Yasuhira
S
S
Research Institute for Tuberculosis and Cancer, Tohoku University, Sendai, Japan.
Yasui
A
A
D000595:Amino Acid Sequence; D000818:Animals; D001419:Bacteria / Q000201:enzymology / Q000235:genetics; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D004255:Deoxyribodipyrimidine Photo-Lyase / Q000096:biosynthesis / Q000235:genetics*; D004790:Enzyme Induction; D004926:Escherichia coli / Q000235:genetics / Q000528:radiation effects*; D005658:Fungi / Q000201:enzymology / Q000235:genetics; D015971:Gene Expression Regulation, Enzymologic / Q000528:radiation effects*; D015723:Gene Library; D005796:Genes / Q000528:radiation effects*; D006054:Goldfish; D007700:Kinetics; D008027:Light; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000096:biosynthesis; D017386:Sequence Homology, Amino Acid
D011994:Recombinant Proteins; D004247:DNA; D004255:Deoxyribodipyrimidine Photo-Lyase