title: DNA ligase IV from a basidiomycete, Coprinus cinereus, and its expression during meiosis.
abstract: DNA ligase IV is thought to be involved in DNA double-strand break repair and DNA non-homologous end-joining pathways, but these mechanisms are still unclear. To investigate the roles of DNA ligase IV from a biologically functional viewpoint, the authors studied its relationship to meiosis in a basidiomycete, Coprinus cinereus, which shows a highly synchronous meiotic cell cycle. The C. cinereus cDNA homologue of DNA ligase IV (CcLIG4) was successfully cloned. The 3.2 kb clone including the ORF encoded a predicted product of 1025 amino acid residues with a molecular mass of 117 kDa. A specific inserted sequence composed of 95 amino acids rich in aspartic acid and glutamic acid could be detected between tandem BRCT domains. The inserted sequence had no sequence identity with other eukaryotic counterparts of DNA ligase IV or with another aspartic acid and glutamic acid rich sequence inserted in C. cinereus proliferating cell nuclear antigen (CcPCNA), although the length and the percentages of aspartic and glutamic acids were similar. In addition, the recombinant CcLIG4 protein not only showed ATP-dependent ligase activity, but also used (dT)(16)/poly(dA) and (dT)(16)/poly(rA) as substrates, and had double-strand ligation activity, like human DNA ligase IV. Northern hybridization analysis and in situ hybridization indicated that CcLIG4 was expressed not only at the pre-meiotic S phase but also at meiotic prophase I. Intense signals were observed in leptotene and zygotene. Based on these observations, the possible role(s) of C. cinereus DNA ligase IV during meiosis are discussed.
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken 278-8510, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Namekawa
authors.affiliation: Department of Pathological Biochemistry, Medical Research Institute, Tokyo Medical and Dental University, Chiyoda-ku, Tokyo 101-0062, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Ichijima
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken 278-8510, Japan.
authors.forename: Fumika
authors.initials: F
authors.lastname: Hamada
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken 278-8510, Japan.
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Kasai
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken 278-8510, Japan.
authors.forename: Kazuki
authors.initials: K
authors.lastname: Iwabata
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken 278-8510, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Nara
authors.affiliation: Department of Pathological Biochemistry, Medical Research Institute, Tokyo Medical and Dental University, Chiyoda-ku, Tokyo 101-0062, Japan.
authors.forename: Hirobumi
authors.initials: H
authors.lastname: Teraoka
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken 278-8510, Japan.
authors.forename: Fumio
authors.initials: F
authors.lastname: Sugawara
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba-ken 278-8510, Japan.
authors.forename: Kengo
authors.initials: K
authors.lastname: Sakaguchi
mesh_terms: D000477:Alkylating Agents / Q000494:pharmacology; D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D003302:Coprinus / Q000166:cytology / Q000201:enzymology* / Q000235:genetics; D000072481:DNA Ligase ATP; D011088:DNA Ligases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004260:DNA Repair; D018076:DNA, Complementary / Q000235:genetics; D004271:DNA, Fungal / Q000235:genetics; D015870:Gene Expression / Q000187:drug effects; D005800:Genes, Fungal; D006801:Humans; D008540:Meiosis; D008741:Methyl Methanesulfonate / Q000494:pharmacology; D008958:Models, Molecular; D008969:Molecular Sequence Data; D008970:Molecular Weight; D011487:Protein Conformation; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid
chemical_list: D000477:Alkylating Agents; D018076:DNA, Complementary; D004271:DNA, Fungal; C000607893:LIG4 protein, human; D011994:Recombinant Proteins; D008741:Methyl Methanesulfonate; D011088:DNA Ligases; D000072481:DNA Ligase ATP