Abstract
SIAH-1, an E3 ubiquitin ligase, plays an important role in regulating cell cycle, tumorigenesis and several neurodegenerative diseases. In this study, we found a novel SIAH-1-interacting protein, EEF1D (Eukaryotic translation elongation factor 1 delta). The interaction was confirmed in vitro and in vivo, and both proteins were co-localized in the cytoplasm. The Cys-rich domain of SIAH-1 was essential for its interaction with EEF1D. Overexpressing SIAH-1 had no effect on the protein level of EEF1D, implying that EFF1D is not the substrate of SIAH-1. In contrast, the protein level of SIAH-1 increased significantly in the cells overexpressing EEF1D. Increased amount of SIAH-1 was caused by the EEF1D-mediated inhibition of auto-ubiquitination and degradation of SIAH-1. Furthermore, EEF1D was able to inhibit the degradation of HPH2, a known substrate of SIAH-1. Taken together, our data suggest EFF1D functions as a novel negative regulator of SIAH-1.
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Acknowledgments
We are grateful to Yan-Hua Wu for critical reading of the manuscript. This study is supported by grants from the National Basic Research Program of China (2010CB912603), National Special Key Project of China (2008ZX10003-006 and 2009ZX09301-011) to K. Huo.
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Wu, H., Shi, Y., Lin, Y. et al. Eukaryotic translation elongation factor 1 delta inhibits the ubiquitin ligase activity of SIAH-1. Mol Cell Biochem 357, 209–215 (2011). https://doi.org/10.1007/s11010-011-0891-5
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DOI: https://doi.org/10.1007/s11010-011-0891-5