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Dioxygen controls the nitrosylation reactions of a protein-bound [4Fe4S] cluster

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  • معلومة اضافية
    • بيانات النشر:
      Royal Society of Chemistry
    • الموضوع:
      2019
    • Collection:
      University of Leicester: Leicester Research Archive (LRA)
    • نبذة مختصرة :
      Electronic supplementary information (ESI) available. See DOI:10.1039/c9dt00924h ; Iron–sulfur clusters are exceptionally tuneable protein cofactors, and as one of their many roles they are involved in biological responses to nitrosative stress. Both iron–sulfur proteins and synthetic model clusters are extremely sensitive to nitrosylation, tending towards rapid multi-step reaction and cluster degradation. Reaction of protein-bound iron–sulfur clusters with nitric oxide can be stopped at partial nitrosylation in vivo, and repair of protein-bound nitrosylated clusters is possible in the cellular environment. We have used a combination of infrared, EPR, and UV-visible spectroscopies to show that a model [4Fe4S] cluster-containing protein, A. ferroxidans high potential iron–sulfur protein (HiPIP), reacts with NO to give a product mixture dominated by Roussin's Black Salt (RBS) and Roussin's Red Ester (RRE) species. We have shown that O2 plays a critical role in controlling the major product of nitrosylation, with RBS-like products favoured under strictly anaerobic conditions and RRE favoured in the presence of trace O2. Moreover, addition of trace O2 to anaerobically nitrosylated samples induces conversion of RBS-like products to RRE. These findings may have implications for mechanisms of iron–sulfur cluster repair following nitrosative stress, suggest a crucial role for trace O2, and provide an important link between nitrosylation chemistry of iron–sulfur proteins and the well-established reactivity of synthetic iron–sulfur clusters. ; This work was supported financially by the Engineering and Physical Sciences Research Council (EPSRC) Small Equipment Award EP/K031503/1 (K. A. V.) and the Biotechnology and Biological Sciences Research Council (BBSRC) BB/P009697/1 (K. A. V. and E. L. D). W. K. M. is supported by the EPSRC (EP/L011972/1, grant to CAESR, the Centre for Advanced Spin Resonance). At the time of research D. B. G. was supported by Biotechnology and Biological Sciences Research Council (BBSRC) studentship ...
    • ISSN:
      1477-9226
    • Relation:
      Dalton Transactions, 2019; https://pubs.rsc.org/en/content/articlelanding/2019/DT/C9DT00924H#!divAbstract; http://hdl.handle.net/2381/45531
    • الرقم المعرف:
      10.1039/C9DT00924H
    • الدخول الالكتروني :
      https://pubs.rsc.org/en/content/articlelanding/2019/DT/C9DT00924H#!divAbstract
      http://hdl.handle.net/2381/45531
      https://doi.org/10.1039/C9DT00924H
    • Rights:
      Copyright © the authors, 2019. This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
    • الرقم المعرف:
      edsbas.7E84F2E0