Download MendeleyCrystal Structure of Isoflavone Reductase from Alfalfa (Medicago sativa L.)
Wang, X., He, X., Lin, J., Shao, H., Chang, Z., Dixon, R.A.(2006) J Mol Biol 358: 1341-1352
- PubMed: 16600295
- DOI: https://doi.org/10.1016/j.jmb.2006.03.022
- Primary Citation of Related Structures:
2GAS - PubMed Abstract:
Isoflavonoids play important roles in plant defense and exhibit a range of mammalian health-promoting activities. Isoflavone reductase (IFR) specifically recognizes isoflavones and catalyzes a stereospecific NADPH-dependent reduction to (3R)-isoflavanone. The crystal structure of Medicago sativa IFR with deletion of residues 39-47 has been determined at 1.6A resolution. Structural analysis, molecular modeling and docking, and comparison with the structures of other NADPH-dependent enzymes, defined the putative binding sites for co-factor and substrate and potential key residues for enzyme activity and substrate specificity. Further mutagenesis has confirmed the role of Lys144 as a catalytic residue. This study provides a structural basis for understanding the enzymatic mechanism and substrate specificity of IFRs as well as the functions of IFR-like proteins.
Organizational Affiliation:
Plant Biology Division, Samuel Roberts Noble Foundation, 2510 Sam Noble Parkway, Ardmore, OK 73401, USA. xwang@noble.org
