Download MendeleyThe functional principle of eukaryotic molybdenum insertases.
Krausze, J., Hercher, T.W., Zwerschke, D., Kirk, M.L., Blankenfeldt, W., Mendel, R.R., Kruse, T.(2018) Biochem J 475: 1739-1753
- PubMed: 29717023
- DOI: https://doi.org/10.1042/BCJ20170935
- Primary Citation of Related Structures:
6ETD, 6ETF, 6ETH, 6GAX, 6GB0, 6GB4, 6GB9, 6GBC, 6GBF - PubMed Abstract:
The molybdenum cofactor (Moco) is a redox-active prosthetic group found in the active site of Moco-dependent enzymes, which are vitally important for life. Moco biosynthesis involves several enzymes that catalyze the subsequent conversion of GTP into cyclic pyranopterin monophosphate (cPMP), molybdopterin (MPT), adenylated MPT (MPT-AMP), and finally Moco. While the underlying principles of cPMP, MPT, and MPT-AMP formation are well understood, the molybdenum insertase (Mo-insertase)-catalyzed final Moco maturation step is not. In the present study, we analyzed high-resolution X-ray datasets of the plant Mo-insertase Cnx1E that revealed two molybdate-binding sites within the active site, hence improving the current view on Cnx1E functionality. The presence of molybdate anions in either of these sites is tied to a distinctive backbone conformation, which we suggest to be essential for Mo-insertase molybdate selectivity and insertion efficiency.
Organizational Affiliation:
Department of Plant Biology, Braunschweig University of Technology, 38106 Braunschweig, Germany.
