Download MendeleyCrystal structure of chorismate synthase: a novel FMN-binding protein fold and functional insights
Ahn, H.J., Yoon, H.J., Lee, B., Suh, S.W.(2004) J Mol Biol 336: 903-915
- PubMed: 15095868
- DOI: https://doi.org/10.1016/j.jmb.2003.12.072
- Primary Citation of Related Structures:
1UM0, 1UMF - PubMed Abstract:
Chorismate synthase catalyzes the conversion of 5-enolpyruvylshikimate 3-phosphate to chorismate in the shikimate pathway, which represents an attractive target for discovering antimicrobial agents and herbicides. Chorismate serves as a common precursor for the synthesis of aromatic amino acids and many aromatic compounds in microorganisms and plants. Chorismate synthase requires reduced FMN as a cofactor but the catalyzed reaction involves no net redox change. Here, we have determined the crystal structure of chorismate synthase from Helicobacter pylori in both FMN-bound and FMN-free forms. It is a tetrameric enzyme, with each monomer possessing a novel "beta-alpha-beta sandwich fold". Highly conserved regions, including several flexible loops, cluster together around the bound FMN to form the active site. The unique FMN-binding site is formed largely by a single subunit, with a small contribution from a neighboring subunit. The isoalloxazine ring of the bound FMN is significantly non-planar. Our structure illuminates the essential functional roles played by the cofactor.
Organizational Affiliation:
Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-0742, South Korea.
