The 40S Ribosomal Protein S6 Response to Blue Light by Interaction with SjAUREO in Saccharina japonica

• Published in: International journal of molecular sciences 2019-05, Vol.20 (10), p.2414
• Main Authors: Luan, Hexiang, Yao, Jianting, Chen, Zhihang, Duan, Delin
• Format: Article
• Language: English
• Subjects: Adenine; Algae; Annotations; Auxotrophs; Binding; Cell cycle; Cell Proliferation; Cloning; Deoxyribonucleic acid; DNA; Electric potential; Gene expression; Gene Expression Profiling; Gene Expression Regulation, Developmental - genetics; Gene Expression Regulation, Developmental - radiation effects; Gene Expression Regulation, Plant - radiation effects; Gene Library; Genes, Plant - genetics; Histidine; Kinases; Laminaria - genetics; Laminaria - metabolism; Laminaria - radiation effects; Leucine zipper proteins; Light; Membrane proteins; N-Terminus; Open reading frames; Photoreceptor Cells - metabolism; Photoreceptor Cells - radiation effects; Photoreceptors; Photosynthesis; Phototropism; Plant Proteins - genetics; Plasmids; Plates (structural members); Protein kinase; Proteins; Reporter gene; Ribosomal protein S6; Ribosomal Protein S6 - metabolism; Ribosomal Protein S6 - radiation effects; Ribosomal Proteins - genetics; Ribosomal Proteins - metabolism; Ribosomal Proteins - radiation effects; Toxicity; Tryptophan; Up-Regulation - radiation effects; Voltage
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms20102414

Blue light (BL) plays an important role in regulation of the growth and development of aquatic plants and land plants. Aureochrome (AUREO), the recent BL photoreceptor identified in photosynthetic stramenopile algae, is involved in the photomorphogenesis and early development of porophytes (kelp). However the factors that interact with the SjAUREO under BL conditions specifically are not clear. Here in our study, three high quality cDNA libraries with CFU over 5 × 10 and a recombination rate of 100% were constructed respectively through white light (WL), BL and darkness (DK) treatments to the juvenile sporophytes. Based on the constructed cDNA libraries, the interactors of SjAUREO were screened and analyzed. There are eighty-four genes encoding the sixteen predicted proteins from the BL cDNA library, sixty-eight genes encoding eighteen predicted proteins from the DK cDNA library, and seventy-four genes encoding nineteen proteins from the WL cDNA library. All the predicted proteins are presumed to interact with SjAUREO when co-expressed with SjAUREO seperately. The 40S ribosomal protein S6 (RPS6), which only exists in the BL treated cDNA library except for two other libraries, and which is essential for cell proliferation and is involved in cell cycle progression, was selected for detailed analysis. We showed that its transcription was up-regulated by BL, and was highly transcribed in the basal blade (meristem region) of juvenile sporophytes but less in the distal part. Taken together, our results indicated that RPS6 was highly involved in BL-mediated kelp cellular division and photomorphogenesis by interacting with SjAUREO.