Download MendeleyCrystal structure of Ralstonia eutropha polyhydroxyalkanoate synthase C-terminal domain and reaction mechanisms.
Kim, J., Kim, Y.J., Choi, S.Y., Lee, S.Y., Kim, K.J.(2017) Biotechnol J 12
- PubMed: 27808482
- DOI: https://doi.org/10.1002/biot.201600648
- Primary Citation of Related Structures:
5HZ2 - PubMed Abstract:
Polyhydroxyalkanoates (PHAs) are natural polyesters synthesized by numerous microorganisms as energy and reducing power storage materials, and have attracted much attention as substitutes for petroleum-based plastics. Here, we report the first crystal structure of Ralstonia eutropha PHA synthase at 1.8 Å resolution and structure-based mechanisms for PHA polymerization. RePhaC1 contains two distinct domains, the N-terminal (RePhaC1 ND ) and C-terminal domains (RePhaC1 CD ), and exists as a dimer. RePhaC1 CD catalyzes polymerization via non-processive ping-pong mechanism using a Cys-His-Asp catalytic triad. Molecular docking simulation of 3-hydroxybutyryl-CoA to the active site of RePhaC1 CD reveals residues involved in the formation of 3-hydroxybutyryl-CoA binding pocket and substrate binding tunnel. Comparative analysis with other polymerases elucidates how different classes of PHA synthases show different substrate specificities. Furthermore, we attempted structure-based protein engineering and developed a RePhaC1 mutant with enhanced PHA synthase activity.
Organizational Affiliation:
School of Life Sciences, KNU Creative BioResearch Group, Kyungpook National University, Daegu, Republic of Korea.
