title: Identification of the specific interactors of the human lariat RNA debranching enzyme 1 protein.
abstract: In eukaryotes, pre-mRNA splicing is an essential step for gene expression. We have been analyzing post-splicing intron turnover steps in higher eukaryotes. Here, we report protein interaction between human Debranching enzyme 1 (hDbr1) and several factors found in the Intron Large (IL) complex, which is an intermediate complex of the intron degradation pathway. The hDbr1 protein specifically interacts with xeroderma pigmentosum, complementeation group A (XPA)-binding protein 2 (Xab2). We also attempted to identify specific interactors of hDbr1. Co-immunoprecipitation experiments followed by mass spectrometry analysis identified a novel protein as one of the specific interactors of hDbr1. This protein is well conserved among many species and shows the highest similarity to yeast Drn1, so it is designated as human Dbr1 associated ribonuclease 1 (hDrn1). hDrn1 directly interacts with hDbr1 through protein-protein interaction. Furthermore, hDrn1 shuttles between the nucleus and the cytoplasm, as hDbr1 protein does. These findings suggest that hDrn1 has roles in both the nucleus and the cytoplasm, which are highly likely to involve hDbr1.
authors: Medical Innovation Center, Laboratory for Malignancy Control Research, Kyoto University Graduate School of Medicine, Sakyo-ku, Kyoto 606-8507, Japan. masaki@dsk.med.kyoto-u.ac.jp.
authors: So
authors: S
authors: Masaki
authors: Chemical Genetics Laboratory, RIKEN Advanced Science Institute, Wako, Saitama 351-0198, Japan. hitoohno@virus.kyoto-u.ac.jp.|Institute for Virus Research, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan. hitoohno@virus.kyoto-u.ac.jp.|Division of Gene Expression Mechanism, Institute for Comprehensive Medical Science, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470-1192, Japan. hitoohno@virus.kyoto-u.ac.jp.
authors: Rei
authors: R
authors: Yoshimoto
authors: Frontier Research Core for Life Sciences, University of Toyama, 2630 Sugitani, Toyama-shi, Toyama 930-0194, Japan. kaida@med.u-toyama.ac.jp.
authors: Daisuke
authors: D
authors: Kaida
authors: Medical Innovation Center, Laboratory for Malignancy Control Research, Kyoto University Graduate School of Medicine, Sakyo-ku, Kyoto 606-8507, Japan. akusa.atah@gmail.com.
authors: Asuka
authors: A
authors: Hata
authors: Frontier Research Core for Life Sciences, University of Toyama, 2630 Sugitani, Toyama-shi, Toyama 930-0194, Japan. tsatoh@med.u-toyama.ac.jp.
authors: Takayuki
authors: T
authors: Satoh
authors: Institute for Virus Research, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan. hitoohno@virus.kyoto-u.ac.jp.
authors: Mutsuhito
authors: M
authors: Ohno
authors: Medical Innovation Center, Laboratory for Malignancy Control Research, Kyoto University Graduate School of Medicine, Sakyo-ku, Kyoto 606-8507, Japan. kataoka.naoyuki.6m@kyoto-u.ac.jp.|Institute for Virus Research, Kyoto University, Sakyo-ku, Kyoto 606-8507, Japan. kataoka.naoyuki.6m@kyoto-u.ac.jp.|Medical Top Track Program, Medical Research Institute, Tokyo Dental and Medical University, Tokyo 113-8510, Japan. kataoka.naoyuki.6m@kyoto-u.ac.jp.
authors: Naoyuki
authors: N
authors: Kataoka
mesh_terms: D000818:Animals; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002467:Cell Nucleus / Q000378:metabolism*; D018920:Coculture Techniques; D003593:Cytoplasm / Q000378:metabolism*; D057809:HEK293 Cells; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism; D018841:HSP90 Heat-Shock Proteins / Q000378:metabolism; D006801:Humans; D047468:Immunoprecipitation; D013058:Mass Spectrometry; D051379:Mice; D041681:NIH 3T3 Cells; D060066:Protein Interaction Maps; D012316:RNA Nucleotidyltransferases / Q000235:genetics / Q000378:metabolism*; D000072260:RNA Splicing Factors; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: C000595891:CWF19L1 protein, human; D018797:Cell Cycle Proteins; D018840:HSP70 Heat-Shock Proteins; D018841:HSP90 Heat-Shock Proteins; D000072260:RNA Splicing Factors; D014157:Transcription Factors; C417244:XAB2 protein, human; C000591939:Dbr1 protein, human; D012316:RNA Nucleotidyltransferases