title: Tyrosine 330 in hSef is critical for the localization and the inhibitory effect on FGF signaling.
abstract: Sef (similar expression to fgf genes) was identified as an inhibitor of FGF signaling. The regulation of this inhibitory effect was largely unknown. In this report we demonstrated that tyrosine 330 in hSef protein plays a critical role in the control of the protein localization and thereby in the regulation of Ras/MAPK signaling pathway. We found that the tyrosine 330 is in the form of the YXXcapital EF, Cyrillic signal context and mutation of this residue resulted in preferred plasma membrane localization of hSef. We also observed that both Sef and SefY330F (where tyrosine is substituted by phenylalanine) interacted and co-localized with FGFR in the co-immunoprecipitation assay, and immunostaining assay respectively. We further revealed that the increased amount of Sef localization in the plasma membrane was coupled with the enhanced inhibitory effect on the FGF signaling pathway, indicating that Sef might exert its inhibitory function on the plasma membrane. This paper revealed that tyrosine 330 is critical for the inhibitory function of Sef on FGF signaling.
authors.affiliation: Department of Biological Sciences and Biotechnology, School of Medicine, Institute of Biomedicine, State Key Laboratory of Biomembrane and Membrane Biotechnology, Tsinghua University, Beijing, China.
authors.forename: Yongming
authors.initials: Y
authors.lastname: Ren
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Li
authors.forename: Zhili
authors.initials: Z
authors.lastname: Rong
authors.forename: Long
authors.initials: L
authors.lastname: Cheng
authors.forename: Yinghua
authors.initials: Y
authors.lastname: Li
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Chang
mesh_terms: D002462:Cell Membrane / Q000378:metabolism; D005346:Fibroblast Growth Factors / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D007118:Immunoassay; D047468:Immunoprecipitation; D009154:Mutation; D010649:Phenylalanine / Q000235:genetics / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism; D018123:Receptors, Interleukin / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology*; D014443:Tyrosine / Q000235:genetics / Q000378:metabolism*; D018631:ras Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: C477526:IL17RD protein, human; D018123:Receptors, Interleukin; D014443:Tyrosine; D010649:Phenylalanine; D005346:Fibroblast Growth Factors; D017346:Protein Serine-Threonine Kinases; D018631:ras Proteins