The iron-containing nitrile hydratase (NHase) is a photoreactive enzyme that is inactivated in the dark because of persistent association with NO and activated by photo-dissociation of NO. The crystal structure at 1.7 A resolution and mass spectrometry revealed the structure of the non-heme iron catalytic center in the nitrosylated state ...
The iron-containing nitrile hydratase (NHase) is a photoreactive enzyme that is inactivated in the dark because of persistent association with NO and activated by photo-dissociation of NO. The crystal structure at 1.7 A resolution and mass spectrometry revealed the structure of the non-heme iron catalytic center in the nitrosylated state. Two Cys residues coordinated to the iron were post-translationally modified to Cys-sulfenic and -sulfinic acids. Together with another oxygen atom of the Ser ligand, these modifications induced a claw setting of oxygen atoms capturing an NO molecule. This unprecedented structure is likely to enable the photo-regulation of NHase and will provide an excellent model for designing photo-controllable chelate complexes and, ultimately, proteins.
Related Citations:
Crystallization of a Photosensitive Nitrile Hydratase from Rhodococcus Sp. N-771 Nagamune, T., Honda, J., Cho, W.D., Kamiya, N., Teratani, Y., Hirata, A., Sasabe, H., Endo, I. (1991) J Mol Biol 220: 221
Organizational Affiliation:
Institut Pasteur, Unité des Interactions Bactéries Cellules, Paris, France.
Download Mendeley
