Download MendeleyStructure of NADP(+)-bound 7 beta-hydroxysteroid dehydrogenase reveals two cofactor-binding modes
Wang, R., Wu, J., Jin, D.K., Chen, Y., Lv, Z., Chen, Q., Miao, Q., Huo, X., Wang, F.(2017) Acta Crystallogr F Struct Biol Commun 73: 246-252
- PubMed: 28471355
- DOI: https://doi.org/10.1107/S2053230X17004460
- Primary Citation of Related Structures:
5GT9 - PubMed Abstract:
In mammals, bile acids/salts and their glycine and taurine conjugates are effectively recycled through enterohepatic circulation. 7β-Hydroxysteroid dehydrogenases (7β-HSDHs; EC 1.1.1.201), including that from the intestinal microbe Collinsella aerofaciens, catalyse the NADPH-dependent reversible oxidation of secondary bile-acid products to avoid potential toxicity. Here, the first structure of NADP + bound to dimeric 7β-HSDH is presented. In one active site, NADP + adopts a conventional binding mode similar to that displayed in related enzyme structures. However, in the other active site a unique binding mode is observed in which the orientation of the nicotinamide is different. Since 7β-HSDH has become an attractive target owing to the wide and important pharmaceutical use of its product ursodeoxycholic acid, this work provides a more detailed template to support rational protein engineering to improve the enzymatic activities of this useful biocatalyst, further improving the yield of ursodeoxycholic acid and its other applications.
Organizational Affiliation:
Wuxi Biortus Biosciences Co. Ltd, A5, 6 Dongsheng West Road, 214437 Jiangyin, Jiangsu, People's Republic of China.
