Posttranslational synthesis of hypusine: evolutionary progression and specificity of the hypusine modification
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Summary.
A naturally occurring unusual amino acid, hypusine [N ɛ-(4-amino-2-hydroxybutyl)-lysine] is a component of a single cellular protein, eukaryotic translation initiation factor 5A (eIF5A). It is a modified lysine with structural contribution from the polyamine spermidine. Hypusine is formed in a novel posttranslational modification that involves two enzymes, deoxyhypusine synthase (DHS) and deoxyhypusine hydroxylase (DOHH). eIF5A and deoxyhypusine/hypusine modification are essential for growth of eukaryotic cells. The hypusine synthetic pathway has evolved in eukaryotes and eIF5A, DHS and DOHH are highly conserved, suggesting maintenance of a fundamental cellular function of eIF5A through evolution. The unique feature of the hypusine modification is the strict specificity of the enzymes toward its substrate protein, eIF5A. Moreover, DHS exhibits a narrow specificity toward spermidine. In view of the extraordinary specificity and the requirement for hypusine-containing eIF5A for mammalian cell proliferation, eIF5A and the hypusine biosynthetic enzymes present new potential targets for intervention in aberrant cell proliferation.
Abbreviations:
- aIF5A
archaeal initiation factor 5A
- DHS
deoxyhypusine synthase
- DOHH
deoxyhypusine hydroxylase
- EF-P
elongation factor P
- eIF5A
eukaryotic translation initiation factor 5A
- eIF5A-1
primary isoform of eIF5A
- eIF5A-2
secondary isoform of eIF5A
- eIF5A(Dhp)
eIF5A intermediate containing deoxyhypusine
- eIF5A(Hpu)
eIF5A active form containing hypusine
- eIF5A(Lys)
eIF5A precursor
- GC7
N 1-guanyl-1,7-diaminoheptane
- HEAT-repeat
alpha-helical structural motif characteristic of Huntingtin, elongation factor 3E, a subunit of protein phosphatase 2A, and the target of rapamycin
- NAD
nicotinamide adenine dinucleotide
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References
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