Haem-ligand switching during catalysis in crystals of a nitrogen-cycle enzyme.
Williams, P.A., Fulop, V., Garman, E.F., Saunders, N.F., Ferguson, S.J., Hajdu, J.(1997) Nature 389: 406-412
- PubMed: 9311786 
- DOI: 10.1038/38775
- Primary Citation of Related Structures:  
1AOF, 1AOM, 1AOQ - PubMed Abstract: 
Cytochrome cd1 nitrite reductase catalyses the conversion of nitrite to nitric oxide in the nitrogen cycle. The crystal structure of the oxidized enzyme shows that the d1 haem iron of the active site is ligated by His/Tyr side chains, and the c haem iron is ligated by a His/His ligand pair ...