Crystal Structure of the Peroxo-Diiron(III) Intermediate of Deoxyhypusine Hydroxylase, an Oxygenase Involved in Hypusination.Han, Z., Sakai, N., Bottger, L.H., Klinke, S., Hauber, J., Trautwein, A.X., Hilgenfeld, R.
(2015) Structure 23: 882
- PubMed: 25865244
- DOI: https://doi.org/10.1016/j.str.2015.03.002
- Primary Citation of Related Structures:
- PubMed Abstract:
Deoxyhypusine hydroxylase (DOHH) is a non-heme diiron enzyme involved in the posttranslational modification of a critical lysine residue of eukaryotic translation initiation factor 5A (eIF-5A) to yield the unusual amino acid residue hypusine. This modification is essential for the role of eIF-5A in translation and in nuclear export of a group of specific mRNAs. The diiron center of human DOHH (hDOHH) forms a peroxo-diiron(III) intermediate (hDOHHperoxo) when its reduced form reacts with O2. hDOHHperoxo has a lifetime exceeding that of the peroxo intermediates of other diiron enzymes by several orders of magnitude. Here we report the 1.7-Å crystal structures of hDOHHperoxo and a complex with glycerol. The structure of hDOHHperoxo reveals the presence of a μ-1,2-peroxo-diiron(III) species at the active site. Augmented by UV/Vis and Mössbauer spectroscopic studies, the crystal structures offer explanations for the extreme longevity of hDOHHperoxo and illustrate how the enzyme specifically recognizes its only substrate, deoxyhypusine-eIF-5A.
Institute of Biochemistry, Center for Structural and Cell Biology in Medicine, University of Lübeck, Ratzeburger Allee 160, 23538 Lübeck, Germany; German Center for Infection Research (DZIF) c/o Institute of Biochemistry, University of Lübeck, Ratzeburger Allee 160, 23538 Lübeck, Germany. Electronic address: email@example.com.