The translation factor eIF5A is the only protein known to contain the amino acid hypusine, which is formed posttranslationally. Hypusinated eIF5A is necessary for cellular proliferation and responses to extracellular stressors, and has been proposed as a target for pharmacologic therapy. Here, we provide the first comprehensive characterization of a novel polyclonal antibody (IU-88) that specifically recognizes the hypusinated eIF5A. IU-88 will be useful for the investigation of eIF5A biology and for the development of assays recognizing hypusinated eIF5A.
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http://dx.doi.org/10.1186/2193-1801-2-421 | DOI Listing |
J Biol Chem
January 2025
Kovler Diabetes Center; Biological Sciences Division; Department of Medicine; Department of Pediatrics, The University of Chicago, Chicago, IL 60637, USA. Electronic address:
Hypusination of eukaryotic translation initiation factor 5A (eIF5A) is essential for its role in translation elongation and termination. Although the function of hypusinated eIF5A (eIF5A) in cellular proliferation is well-characterized, the role of its unhypusinated form (eIF5A) remains unclear. We hypothesized that eIF5A exerts independent, negative effects on cellular replication and metabolism, distinct from the loss of eIF5A.
View Article and Find Full Text PDFStructure
January 2025
Małopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland. Electronic address:
Deoxyhypusination is the first rate-limiting step of the unique post-translational modification-hypusination-that is catalyzed by deoxyhypusine synthase (DHS) and deoxyhypusine hydroxylase (DOHH). This modification is essential for the activation of translation factor 5A in eukaryotes (eIF5A) and Archaea (aIF5A). This perspective focuses on the structural biology of deoxyhypusination complexes in eukaryotic and archaeal organisms.
View Article and Find Full Text PDFPurpose: Understanding the molecular mechanisms of adaptive regulation in the tumor microenvironment is crucial for precision therapy in hepatocellular carcinoma (HCC). We hypothesized that cargo proteins carried by extracellular vesicles (EVs) released in a hypoxic microenvironment might promote HCC progression by remodeling tumor-associated macrophages (TAMs).
Methods: EV protein analysis by label-free proteomics mass spectrometry of HCC cell lines of different tumor grades was performed.
Biomolecules
December 2024
Department of Sciences, University of Roma Tre, 00146 Rome, Italy.
The polyamines putrescine, spermidine, and spermine are polycations ubiquitously present in cells, where they exert pleiotropic functions in cellular mechanisms like proliferation, protein synthesis (through the hypusination of the transcription factor EIF5a), redox balance, autophagy, and different forms of cell death [...
View Article and Find Full Text PDFSci Rep
January 2025
Department of Pathology and Laboratory Medicine, Collage of Medicine, the University of Tennessee Health Science Center, Memphis, TN, 38163, United States.
Deoxyhypusine synthase (DHPS) is an enzyme encoded by the DHPS gene, with high expression in various cancers, including ovarian cancer (OC). DHPS regulates the translation initiation factor EIF5A, and EIF5A2 knockout inhibits OC tumor growth and metastasis by blocking the epithelial-to-mesenchymal transition (EMT) and the TGFβ pathway. In this study, we show that DHPS is amplified in OC patients, and its elevated expression correlates with poor survival.
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