Identification of a novel binding protein of FAT10: eukaryotic translation elongation factor 1A1.

Digestive Diseases and Sciences
Xin YuJianghua Shao

Abstract

FAT10 is known to execute its functions mainly through conjugation to different substrates, and these known functions include cytokine responses, apoptosis, mitosis, and tumorigenesis. Nonetheless, the known binding proteins of FAT10 cannot explain all its known functions. As such, the aim of this study was to identify unidentified conjugation proteins of FAT10. The yeast two-hybrid system was employed in this study. FAT10 was used as the bait protein for screening of a cDNA library from a human hepatocellular carcinoma cell line, Hep3B. Protein interactions were confirmed based on localization studies and co-immunoprecipitation assays. The expression of mRNA and protein was determined using real-time polymerase chain reaction and western blot analyses, respectively. In this study, we identified eukaryotic elongation factor 1A1 (eEF1A1) as a FAT10-specific binding protein. The binding between FAT10 and eEF1A1 was confirmed both in vivo and in vitro. We also found that, when the expression of FAT10 was reduced by siRNA knockdown, this resulted in downregulation of eEF1A1 expression at both the mRNA and protein levels in human hepatocellular carcinoma cells. We propose a model in which eEF1A1 serves as a substrate of FAT10 to acc...Continue Reading

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Citations

Jun 29, 2018·Genes·Shuaichen LiuCaroline G L Lee
Apr 6, 2016·The Journal of Biological Chemistry·Flora BrozziDécio L Eizirik
Jul 29, 2020·Journal of Cell Science·Annette Aichem, Marcus Groettrup
Nov 16, 2019·Current Molecular Pharmacology·Senfeng XiangMeidan Ying

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