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Title: NRVS Studies of the Peroxide Shunt Intermediate in a Rieske Dioxygenase and Its Relation to the Native FeII O2 Reaction

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.8b01822· OSTI ID:1465137
 [1];  [2];  [1];  [1];  [2];  [3];  [4];  [5];  [6];  [6];  [6];  [6];  [7];  [7]; ORCiD logo [2]; ORCiD logo [8]
  1. Stanford Univ., CA (United States). Dept. of Chemistry
  2. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Biochemistry, Molecular Biology, & Biophysics
  3. Stanford Univ., CA (United States). Dept. of Chemistry; Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic). J. Heyrovsky Inst. of Physical Chemistry
  4. Stanford Univ., CA (United States). Dept. of Chemistry; Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of). Dept. of Chemistry
  5. Japan Synchrotron Radiation Research Inst., Hyogo (Japan)
  6. Kyoto Univ. (Japan). Research Reactor Inst.
  7. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  8. Stanford Univ., CA (United States). Dept. of Chemistry; SLAC National Accelerator Lab., Menlo Park, CA (United States)

The Rieske dioxygenases are a major subclass of mononuclear nonheme iron enzymes that play an important role in bioremediation. Recently, a high-spin FeIII-(hydro)-peroxy intermediate (BZDOp) has been trapped in the peroxide shunt reaction of benzoate 1,2-dioxygenase. Here, defining the structure of this intermediate is essential to understanding the reactivity of these enzymes. Nuclear resonance vibrational spectroscopy (NRVS) is a recently developed synchrotron technique that is ideal for obtaining vibrational, and thus structural, information on Fe sites, as it gives complete information on all vibrational normal modes containing Fe displacement. In this study, we present NRVS data on BZDOp and assign its structure using these data coupled to experimentally calibrated density functional theory calculations. From this NRVS structure, we define the mechanism for the peroxide shunt reaction. The relevance of the peroxide shunt to the native Fe-II/O2 reaction is evaluated. For the native FeII/O2 reaction, an FeIII-superoxo intermediate is found to react directly with substrate. This process, while uphill thermodynamically, is found to be driven by the highly favorable thermodynamics of proton-coupled electron transfer with an electron provided by the Rieske [2Fe-2S] center at a later step in the reaction. Finally, these results offer important insight into the relative reactivities of FeIII-superoxo and FeIII-hydroperoxo species in nonheme Fe biochemistry.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Institutes of Health (NIH); Japan Society for the Promotion of Science (JSPS). KAKENHI; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1465137
Journal Information:
Journal of the American Chemical Society, Vol. 140, Issue 16; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Insights from $^{125}Te$ and $^{57}Fe$ nuclear resonance vibrational spectroscopy: a [4Fe–4Te] cluster from two points of view text January 2019
Spectroscopic Characterisation of the Naphthalene Dioxygenase from Rhodococcus sp. Strain NCIMB12038 journal July 2019