1uuv
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NAPHTHALENE 1,2-DIOXYGENASE WITH NITRIC OXIDE AND INDOLE BOUND IN THE ACTIVE SITE.
OverviewOverview
Nitric oxide (NO) is commonly used as an analogue for dioxygen in structural and spectroscopic studies of oxygen binding and oxygen activation. In this study, crystallographic structures of naphthalene dioxygenase (NDO) in complex with nitric oxide are reported. In the presence of the aromatic substrate indole, NO is bound end-on to the active-site mononuclear iron of NDO. The structural observations correlate well with spectroscopic measurements of NO binding to NDO in solution. However, the end-on binding of NO is in contrast to the recently reported structure of oxygen to the active-site iron of NDO that binds side-on. While NO is a good oxygen analogue with many similarities to O(2), the different binding mode of NO to the active-site iron atom leads to different mechanistic implications. Hence, caution needs to be used in extrapolating NO as an analogue to O(2) binding.
About this StructureAbout this Structure
1UUV is a Protein complex structure of sequences from Pseudomonas putida with , , , , and as ligands. Active as Naphthalene 1,2-dioxygenase, with EC number 1.14.12.12 Known structural/functional Site: . Full crystallographic information is available from OCA.
ReferenceReference
NO binding to naphthalene dioxygenase., Karlsson A, Parales JV, Parales RE, Gibson DT, Eklund H, Ramaswamy S, J Biol Inorg Chem. 2005 Aug;10(5):483-9. Epub 2005 Sep 23. PMID:15942729
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