title: AC3-33, a novel secretory protein, inhibits Elk1 transcriptional activity via ERK pathway.
abstract: The transcription factor AP-1 plays an important role in cellular proliferation, transformation and death. In this study, we report a novel human gene, AC3-33 (GenBank name: c3orf33, FLJ31139), which encodes a secretory protein that can inhibit Elk1 transcriptional activity via ERK1/2 pathway. The AC3-33 mRNA encodes a protein of 251 amino acids, which is a classical secretory protein. Functional investigation reveals that overexpression of AC3-33 significantly inhibit AP-1 activity and DNA-binding ability. Further investigation indicated that overexpression of AC3-33 significantly inhibit transcriptional activity of Elk1 and c-jun, but not c-fos. As for the upstream of signaling pathway of Elk-1, our study demonstrated that overexpression of AC3-33 significantly down-regulates phosphorylation of ERK1/2, but not JNK/SAPK or p38 MAPK. These results clearly indicate that AC3-33 is a novel member of the secretory family and inhibits Elk1 transcriptional activity via ERK1/2 MAPK.
authors.affiliation: Department of Biology, Northchina Coal Medical College, No. 57 JianShe South Road, Tangshan, 063000, People's Republic of China.
authors.forename: Dongxia
authors.initials: D
authors.lastname: Hao
authors.forename: Peng
authors.initials: P
authors.lastname: Gao
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.forename: Jie
authors.initials: J
authors.lastname: Zhao
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.forename: Wenping
authors.initials: W
authors.lastname: Yang
authors.forename: Yang
authors.initials: Y
authors.lastname: Lu
authors.forename: Taiping
authors.initials: T
authors.lastname: Shi
authors.forename: Xiujun
authors.initials: X
authors.lastname: Zhang
mesh_terms: D002460:Cell Line; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism*; D015723:Gene Library; D006801:Humans; D008565:Membrane Proteins; D008954:Models, Biological; D008969:Molecular Sequence Data; D010766:Phosphorylation; D011506:Proteins / Q000378:metabolism*; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism; D016755:Proto-Oncogene Proteins c-jun / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014018:Tissue Distribution; D014158:Transcription, Genetic; D050807:ets-Domain Protein Elk-1 / Q000037:antagonists & inhibitors* / Q000378:metabolism; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: C552402:C3orf33 protein, human; C494112:ELK1 protein, human; D008565:Membrane Proteins; D011506:Proteins; D016760:Proto-Oncogene Proteins c-fos; D016755:Proto-Oncogene Proteins c-jun; D050807:ets-Domain Protein Elk-1; D048049:Extracellular Signal-Regulated MAP Kinases; D048051:p38 Mitogen-Activated Protein Kinases