1.Brain Tumor Research Center, Beijing Neurosurgical Institute, Capital Medical University, Beijing 100070, China;2.National Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100005, China
This work was supported by grants from The National Natural Science Foundation of China (81672478,81772671), the Beijing Natural Science Foundation (7151002), the Beijing Health System High-level Personnel Building Foundation (2013-3-018) and the Beijing Laboratory of Biomedical Materials Foundation.
Nerve growth factor (NGF) can bind to cell surface receptor p75NTR and TrkA and play a vital role in cell differentiation, survival, apoptosis, proliferation and migration. TrkA interacted with multiple proteins in vivo, but due to the complexity of the NGF signaling pathway, it is still necessary to explore more proteins that interact with TrkA to gain a more accurate understanding of the NGF pathway. Here we report eIF4A1 is a new partner of TrkA. We found eIF4A1 interacted with TrkA via the yeast two hybrid assay. And then the association between TrkA and eIF4A1 was identified by GST pull-down and co-immunoprecipitation assay. Additionally, NGF stimulated this interaction and the associated binding domain is the N-terminus domain (NTD) in eIF4A1 and the TK domain in TrkA. And eIF4A1 could colocalize with TrkA at cell membrane. Furthermore, eIF4A1 also inhibits TrkA polyubiquitination through lysine (Lys)-63-linked polyubiquitin chains which causes its internalization. So eIF4A1 plays a novel role in NGF signaling pathway.
ZHANG Jun-Wen, CUI Ying-Bin, CHEN Hong, HUANG Bing-Ren, LIU Fu-Sheng. eIF4A1 is Associated With TrkA and Inhibits TrkA Polyubiquitination[J]. Progress in Biochemistry and Biophysics,2019,46(8):812-822
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