3MZB

X-ray structure of NikA in complex with the doubly hydroxylated iron complex, 1-O2

Summary for 3MZB

• Entry DOI: 10.2210/pdb3mzb/pdb
• Related: 3MVW 3MVX 3MVY 3MVZ 3MW0 3MZ9
• Descriptor: Nickel-binding periplasmic protein, ACETATE ION, SULFATE ION, ... (9 entities in total)
• Functional Keywords: protein-bound iron complex, transport protein
• Biological source: Escherichia coli
• Cellular location: Periplasm (Probable): P33590
• Total number of polymer chains: 2
• Total formula weight: 115872.26

Authors

Cavazza, C.,Bochot, C.,Rousselot-Pailley, P.,Carpentier, P.,Cherrier, M.V.,Martin, L.,Marchi-Delapierre, C.,Fontecilla-Camps, J.C.,Menage, S. (deposition date: 2010-05-12, release date: 2011-02-09, Last modification date: 2023-11-01)

Primary citation

Cavazza, C.,Bochot, C.,Rousselot-Pailley, P.,Carpentier, P.,Cherrier, M.V.,Martin, L.,Marchi-Delapierre, C.,Fontecilla-Camps, J.C.,Menage, S.
Crystallographic snapshots of the reaction of aromatic C-H with O(2) catalysed by a protein-bound iron complex
NAT.CHEM., 2:1069-1076, 2010

PubMed Abstract: Chemical reactions inside single crystals are quite rare because crystallinity is difficult to retain owing to atomic rearrangements. Protein crystals in general have a high solvent content. This allows for some molecular flexibility, which makes it possible to trap reaction intermediates of enzymatic reactions without disrupting the crystal lattice. A similar approach has not yet been fully implemented in the field of inorganic chemistry. Here, we have combined model chemistry and protein X-ray crystallography to study the intramolecular aromatic dihydroxylation by an arene-containing protein-bound iron complex. The bound complex was able to activate dioxygen in the presence of a reductant, leading to the formation of catechol as the sole product. The structure determination of four of the catalytic cycle intermediates and the end product showed that the hydroxylation reaction implicates an iron peroxo, generated by reductive O(2) activation, an intermediate already observed in iron monooxygenases. This strategy also provided unexpected mechanistic details such as the rearrangement of the iron coordination sphere on metal reduction.

PubMed: 21107372
DOI: 10.1038/nchem.841

Experimental method

X-RAY DIFFRACTION (1.7 Å)