2bmq
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THE CRYSTAL STRUCTURE OF NITROBENZENE DIOXYGENASE IN COMPLEX WITH NITROBENZENE
OverviewOverview
Nitroaromatic compounds are used extensively in many industrial processes, and have been released into the environment where they are considered, environmental pollutants. Nitroaromatic compounds, in general, are, resistant to oxidative attack due to the electron-withdrawing nature of, the nitro groups and the stability of the benzene ring. However, the, bacterium Comamonas sp. strain JS765 can grow with nitrobenzene as a sole, source of carbon, nitrogen and energy. Biodegradation is initiated by the, nitrobenzene dioxygenase (NBDO) system. We have determined the structure, of NBDO, which has a hetero-hexameric structure similar to that of several, other Rieske non-heme iron dioxygenases. The catalytic subunit contains a, Rieske iron-sulfur center and an active-site mononuclear iron atom. The, structures of complexes with substrates nitrobenzene and 3-nitrotoluene, reveal the structural basis for its activity with nitroarenes. The, substrate pocket contains an asparagine residue that forms a hydrogen bond, to the nitro-group of the substrate, and orients the substrate in relation, to the active-site mononuclear iron atom, positioning the molecule for, oxidation at the nitro-substituted carbon.
About this StructureAbout this Structure
2BMQ is a Protein complex structure of sequences from Comamonas sp. with FE, NI, FES, NBZ, EDO and EOH as ligands. Known structural/functional Site: . Full crystallographic information is available from OCA.
ReferenceReference
Structural insight into the dioxygenation of nitroarene compounds: the crystal structure of nitrobenzene dioxygenase., Friemann R, Ivkovic-Jensen MM, Lessner DJ, Yu CL, Gibson DT, Parales RE, Eklund H, Ramaswamy S, J Mol Biol. 2005 May 20;348(5):1139-51. Epub 2005 Apr 7. PMID:15854650
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- Comamonas sp.
- Protein complex
- Eklund, H.
- Friemann, R.
- Gibson, D.T.
- Ivkovic-Jensen, M.M.
- Lessner, D.J.
- Parales, R.E.
- Ramaswamy, S.
- Yu, C.
- EDO
- EOH
- FE
- FES
- NBZ
- NI
- Crystal structure
- Metal-binding
- Nad
- Nitroarene
- Nitrobenzene dioxygenase
- Oxidoreductase
- Rieske non-heme dioxygenase
- Substrate specificity iron-sulfur