The Many Faces of Hypusinated eIF5A: Cell Context-Specific Effects of the Hypusine Circuit and Implications for Human Health

• Published in: International journal of molecular sciences 2024-08, Vol.25 (15), p.8171
• Main Authors: Nakanishi, Shima, Cleveland, John L
• Format: Article
• Language: English
• Subjects: Amino acids; Animals; B cells; Breast cancer; Cell growth; DHPS; Diabetes; DOHH; Drug resistance; eIF5A; Enzymes; Eukaryotic Translation Initiation Factor 5A; Genetic translation; Glucose; Health; Homeostasis; Humans; hypusine; Inflammation; Inflammatory bowel disease; Insulin resistance; Kinases; Lysine; Lysine - analogs & derivatives; Lysine - metabolism; Metastasis; Mice; Mixed Function Oxygenases - genetics; Mixed Function Oxygenases - metabolism; Mutation; Neurodevelopmental disorders; Oxidoreductases Acting on CH-NH Group Donors - genetics; Oxidoreductases Acting on CH-NH Group Donors - metabolism; Pancreatic cancer; Peptide Initiation Factors - genetics; Peptide Initiation Factors - metabolism; polyamine; Polyamines; Protein Biosynthesis; Protein synthesis; Proteins; Proteomics; Ribonucleic acid; RNA; RNA-Binding Proteins - genetics; RNA-Binding Proteins - metabolism; spermidine; Type 2 diabetes
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms25158171

The unique amino acid hypusine [N -(4-amino-2-hydroxybutyl)lysine] is exclusively formed on the translational regulator eukaryotic initiation factor 5A (eIF5A) via a process coined hypusination. Hypusination is mediated by two enzymes, deoxyhypusine synthase (DHPS) and deoxyhypusine hydroxylase (DOHH), and hypusinated eIF5A (eIF5A ) promotes translation elongation by alleviating ribosome pauses at amino acid motifs that cause structural constraints, and it also facilitates translation initiation and termination. Accordingly, eIF5A has diverse biological functions that rely on translational control of its targets. Homozygous deletion of , , or in mice leads to embryonic lethality, and heterozygous germline variants in and biallelic variants in and are associated with rare inherited neurodevelopmental disorders, underscoring the importance of the hypusine circuit for embryonic and neuronal development. Given the pleiotropic effects of eIF5A , a detailed understanding of the cell context-specific intrinsic roles of eIF5A and of the chronic versus acute effects of eIF5A inhibition is necessary to develop future strategies for eIF5A -targeted therapy to treat various human health problems. Here, we review the most recent studies documenting the intrinsic roles of eIF5A in different tissues/cell types under normal or pathophysiological conditions and discuss these unique aspects of eIF5A -dependent translational control.