Abstract
Thiamine pyrophosphate is an essential coenzyme in all organisms. Its biosynthesis involves independent syntheses of the precursors, pyrimidine and thiazole, which are then coupled. In our previous study with overexpressed and silent mutants of ActhiS (thiazole biosynthesis enzyme from Acremonium chrysogenum), we found that the enzyme level correlated with intracellular thiamine content in A. chrysogenum. However, the exact structure and function of ActhiS remain unclear. In this study, the enzyme-bound ligand was characterized as the ADP adduct of 5-(2-hydroxyethyl)-4-methylthia-zole-2-carboxylic acid (ADT) using HPLC and 1H NMR. The ligand-free ActhiS expressed in M9 minimal medium catalyzed conversion of NAD+ and glycine to ADT in the presence of iron. Furthermore, the C217 residue was identified as the sulfur donor for the thiazole moiety. These observations confirm that ActhiS is a thiazole biosynthesis enzyme in A. chrysogenum, and it serves as a sulfur source for the thiazole moiety.
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Abbreviations
- ActhiS:
-
thiazole biosynthesis enzyme from Acremonium chrysogenum
- ADT:
-
adenylated thiazole (ADP adduct of 5-(2-hydroxyethyl)-4-methylthiazole-2-carboxylic acid)
- PDC:
-
pyruvate decarboxylase
- PDH:
-
pyruvate dehydro-genase
- ThDP:
-
thiamine diphosphorylated
- ThMP:
-
thiamine monophosphorylated
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Published in Russian in Biokhimiya, 2017, Vol. 82, No. 7, pp. 1107–1117.
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Song, Z., Pan, J., Xie, L. et al. Expression, purification, and activity of ActhiS, a thiazole biosynthesis enzyme from Acremonium chrysogenum . Biochemistry Moscow 82, 852–860 (2017). https://doi.org/10.1134/S0006297917070112
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DOI: https://doi.org/10.1134/S0006297917070112