title: DX16 is a novel SR protein phosphorylated by DOA.
abstract: The serine-arginine-rich (SR) proteins belong to a conserved splicing factor family that not only is essential for constitutive pre-mRNA splicing, but also plays important roles in regulation of alternative splicing. Dx16 is a member of SR protein family in Drosophila. In order to get more insight of dx16 function, we identified the proteins interacting with DX16 through yeast two-hybrid and GST-pull down assays. DX16 interacts with the U1 snRNP subunit CG7564, the SR protein RBP1 and the SR protein kinase DOA. The first and second serine-and arginine-rich regions of DOA are required for the interaction between DOA and DX16. DX16 could be phosphorylated by DOA in vitro and DX16 is highly phosphorylated in vivo. Immunofluorescence microscopy results reveal that doa and dx16 are both highly expressed in embryonic central nervous system. These results suggest that DX16 could be a novel SR protein phosphorylated by DOA and it may participate in the formation of splicing complex through its interactions with other splicing related proteins.
authors.affiliation: Department of Genetics and Developmental Biology, Southeast University Medical School, The Key Laboratory of Developmental Genes and Human Disease, Ministry of Education, Nanjing, PR China.
authors.forename: Yongqi
authors.initials: Y
authors.lastname: Wan
authors.forename: Mingkuan
authors.initials: M
authors.lastname: Sun
authors.forename: Shanzhi
authors.initials: S
authors.lastname: Wang
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.forename: Liudi
authors.initials: L
authors.lastname: Yuan
authors.forename: Wei
authors.initials: W
authors.lastname: Xie
mesh_terms: D000818:Animals; D004330:Drosophila / Q000196:embryology; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism*; D004625:Embryo, Nonmammalian; D018507:Gene Expression Regulation, Developmental; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation; D011485:Protein Binding; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D012323:RNA Processing, Post-Transcriptional / Q000502:physiology; D000072260:RNA Splicing Factors; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D017412:Ribonucleoprotein, U1 Small Nuclear / Q000378:metabolism; D000068103:Serine-Arginine Splicing Factors; D014018:Tissue Distribution