Enzymological and structural characterization of Arabidopsis thaliana heme oxygenase-1.
Wang, J., Li, X., Chang, J.W., Ye, T., Mao, Y., Wang, X., Liu, L.(2022) FEBS Open Bio 12: 1677-1687
- PubMed: 35689519 
- DOI: https://doi.org/10.1002/2211-5463.13453
- Primary Citation of Related Structures:  
7EQH - PubMed Abstract: 
Arabidopsis thaliana heme oxygenase-1 (AtHO-1), a metabolic enzyme in the heme degradation pathway, serves as a prototype for study of the bilin-related functions in plants. Past biological analyses revealed that AtHO-1 requires ferredoxin-NADP + reductase (FNR) and ferredoxin for its enzymatic activity. Here, we characterized the binding and degradation of heme by AtHO-1, and found that ferredoxin is a dispensable component of the reducing system that provides electrons for heme oxidation. Furthermore, we reported the crystal structure of heme-bound AtHO-1, which demonstrates both conserved and previously undescribed features of plant heme oxygenases. Finally, the electron transfer pathway from FNR to AtHO-1 is suggested based on the known structural information.
Organizational Affiliation: 
School of Life Sciences, Anhui University, Hefei, China.