Crystal structures of intermediates in the nitroalkane oxidase reaction

Annie Héroux, Dragana M. Bozinovski, Michael P. Valley, Paul F Fitzpatrick, Allen M. Orville

Research output: Contribution to journalArticle

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Abstract

The flavoenzyme nitroalkane oxidase is a member of the acyl-CoA dehydrogenase superfamily. Nitroalkane oxidase catalyzes the oxidation of neutral nitroalkanes to nitrite and the corresponding aldehydes or ketones. Crystal structures to 2.2 Å resolution or better of enzyme complexes with bound substrates and of a trapped substrate-flavin adduct are described. The D402N enzyme has no detectable activity with neutral nitroalkanes [Valley, M. P., and Fitzpatrick, P. F. (2003) J. Am. Chem. Soc. 125, 8738-8739]. The structure of the D402N enzyme crystallized in the presence of 1-nitrohexane or 1-nitrooctane shows the presence of the substrate in the binding site. The aliphatic chain of the substrate extends into a tunnel leading to the enzyme surface. The oxygens of the substrate nitro group interact both with amino acid residues and with the 2′-hydroxyl of the FAD. When nitroalkane oxidase oxidizes nitroalkanes in the presence of cyanide, an electrophilic flavin imine intermediate can be trapped [Valley, M. P., Tichy, S. E., and Fitzpatrick, P. F. (2005) J. Am. Chem. Soc. 127, 2062-2066]. The structure of the enzyme trapped with cyanide during oxidation of 1-nitrohexane shows the presence of the modified flavin. A continuous hydrogen bond network connects the nitrogen of the CN-hexyl-FAD through the FAD 2′-hydroxyl to a chain of water molecules extending to the protein surface. Together, our complementary approaches provide strong evidence that the flavin cofactor is in the appropriate oxidation state and correlates well with the putative intermediate state observed within each of the crystal structures. Consequently, these results provide important structural descriptions of several steps along the nitroalkane oxidase reaction cycle.

Original languageEnglish (US)
Pages (from-to)3407-3416
Number of pages10
JournalBiochemistry
Volume48
Issue number15
DOIs
StatePublished - Apr 21 2009

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Crystal structure
Flavin-Adenine Dinucleotide
Substrates
Enzymes
Cyanides
Hydroxyl Radical
Oxidation
Acyl-CoA Dehydrogenase
Imines
Nitrites
Ketones
Aldehydes
Hydrogen
Tunnels
Hydrogen bonds
Membrane Proteins
Nitrogen
Binding Sites
2-nitropropane dioxygenase
Oxygen

ASJC Scopus subject areas

  • Biochemistry

Cite this

Héroux, A., Bozinovski, D. M., Valley, M. P., Fitzpatrick, P. F., & Orville, A. M. (2009). Crystal structures of intermediates in the nitroalkane oxidase reaction. Biochemistry, 48(15), 3407-3416. https://doi.org/10.1021/bi8023042

Crystal structures of intermediates in the nitroalkane oxidase reaction. / Héroux, Annie; Bozinovski, Dragana M.; Valley, Michael P.; Fitzpatrick, Paul F; Orville, Allen M.

In: Biochemistry, Vol. 48, No. 15, 21.04.2009, p. 3407-3416.

Research output: Contribution to journalArticle

Héroux, A, Bozinovski, DM, Valley, MP, Fitzpatrick, PF & Orville, AM 2009, 'Crystal structures of intermediates in the nitroalkane oxidase reaction', Biochemistry, vol. 48, no. 15, pp. 3407-3416. https://doi.org/10.1021/bi8023042
Héroux, Annie ; Bozinovski, Dragana M. ; Valley, Michael P. ; Fitzpatrick, Paul F ; Orville, Allen M. / Crystal structures of intermediates in the nitroalkane oxidase reaction. In: Biochemistry. 2009 ; Vol. 48, No. 15. pp. 3407-3416.
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