Download MendeleyCrystal structure of UbiX, an aromatic acid decarboxylase from the psychrophilic bacterium Colwellia psychrerythraea that undergoes FMN-induced conformational changes.
Do, H., Kim, S.J., Lee, C.W., Kim, H.W., Park, H.H., Kim, H.M., Park, H., Park, H., Lee, J.H.(2015) Sci Rep 5: 8196-8196
- PubMed: 25645665
- DOI: https://doi.org/10.1038/srep08196
- Primary Citation of Related Structures:
4RHE, 4RHF - PubMed Abstract:
The ubiX gene of Colwellia psychrerythraea strain 34H encodes a 3-octaprenyl-4-hydroxybenzoate carboxylase (CpsUbiX, UniProtKB code: Q489U8) that is involved in the third step of the ubiquinone biosynthesis pathway and harbors a flavin mononucleotide (FMN) as a potential cofactor. Here, we report the crystal structures of two forms of CpsUbiX: an FMN-bound wild type form and an FMN-unbound V47S mutant form. CpsUbiX is a dodecameric enzyme, and each monomer possesses a typical Rossmann-fold structure. The FMN-binding domain of UbiX is composed of three neighboring subunits. The highly conserved Gly15, Ser41, Val47, and Tyr171 residues play important roles in FMN binding. Structural comparison of the FMN-bound wild type form with the FMN-free form reveals a significant conformational difference in the C-terminal loop region (comprising residues 170-176 and 195-206). Subsequent computational modeling and liposome binding assay both suggest that the conformational flexibility observed in the C-terminal loops plays an important role in substrate and lipid bindings. The crystal structures presented in this work provide structural framework and insights into the catalytic mechanism of CpsUbiX.
- Division of Polar Life Sciences, Korea Polar Research Institute, Incheon 406-840, Republic of Korea.
Organizational Affiliation:
