Involvement of SRD2-mediated activation of snRNA transcription in the control of cell proliferation competence in Arabidopsis.
The transcription machinery of small nuclear RNA (snRNA) genes has been investigated extensively in human cell-free systems, but its physiological function in vivo has not been addressed. This paper demonstrates the physiological role of an activator of snRNA transcription using a temperature-sensitive mutant of Arabidopsis thaliana, srd2. Phenotypic characteristics of the srd2 mutant suggest that the SRD2 gene participates in the control of competence in cell proliferation. The SRD2 gene encodes a nuclear protein that shares sequence similarity with the human SNAP50 protein, which is a subunit of SNAPc and is required for snRNA transcription in vitro. Our results, obtained from analysis of snRNA expression in the srd2 mutant, indicate that the SRD2 protein functions in the upregulation of transcription of snRNA genes, the promoters of which contain the upstream sequence element, to elevate cell proliferation competence.
Ohtani
Misato
M
Botanical Gardens, Graduate School of Science, The University of Tokyo, 3-7-1 Hakusan, Bunkyo-ku, Tokyo 112-0001, Japan.
Sugiyama
Munetaka
M
D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000166:cytology* / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000502:physiology*; D049109:Cell Proliferation; D018506:Gene Expression Regulation, Plant; D018546:Hypocotyl / Q000166:cytology / Q000502:physiology; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D011401:Promoter Regions, Genetic; D018749:RNA, Plant / Q000502:physiology*; D012342:RNA, Small Nuclear / Q000502:physiology*; D036226:Seedlings / Q000502:physiology; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors / Q000235:genetics / Q000502:physiology*; D014158:Transcription, Genetic
D029681:Arabidopsis Proteins; D018749:RNA, Plant; D012342:RNA, Small Nuclear; C504798:SRD2 protein, Arabidopsis; D014157:Transcription Factors