Abstract
A re-investigation of the interaction with NO of the small tetraheme protein cytochrome c554 (C554) from Nitrosomonas europaea has shown that the 5-coordinate heme II of the two- or four-electron-reduced protein will nitrosylate reversibly. The process is first order in C554, first order in NO, and second-order overall. The rate constant for NO binding to the heme is 3000 ± 140 M−1s−1, while that for dissociation is 0.034 ± 0.009 s−1; the degree of protein reduction does not appear to significantly influence the nitrosylation rate. In contrast to a previous report (Upadhyay AK, et al. J Am Chem Soc 128:4330, 2006), this study found no evidence of C554-catalyzed NO reduction, either with \( {\text{C}}_{554}^{2 - } \) or with \( {\text{C}}_{554}^{4 - } . \) Some sub-stoichiometric oxidation of the lowest potential heme IV was detected when \( {\text{C}}_{554}^{4 - } \) was exposed to an excess of NO, but this is believed to arise from partial intramolecular electron transfer that generates {Fe(NO)}8 at heme II. The vacant heme II coordination site of C554 is crowded by three non-bonding hydrophobic amino acids. After replacing one of these (Phe156) with the smaller alanine, the nitrosylation rate for F156A2− and F156A4− was about 400× faster than for the wild type, though the rate of the reverse denitrosylation process was almost unchanged. Unlike in the wild-type C554, the 6-coordinate low-spin hemes of F156A4− oxidized over the course of several minutes after exposure to NO. Concomitant formation of N2O could explain this heme oxidation, though alternative explanations are equally plausible given the available data.
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Abbreviations
- C554 :
-
Cytochrome c554
- NOR:
-
Nitric oxide reductase
- PaPy2Q:
-
N,N-bis(2-pyridylmethyl)-amine-N-ethyl-2-quinoline-2-carboxamide)
- DEANO:
-
1-(N,N-diethylamino)diazene-1-ium-1,2-diolate
- HEPES:
-
N-(2-hydroxyethyl) piperazine-N-ethanesulfonic acid
- SVD:
-
Singular value decomposition
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Acknowledgements
Major funding for this work was provided by National Science Foundation Grants MCB-1121770, MCB-1330809, and MCB-1616824. The authors are indebted to Graham Moran and Nicholas Silvaggi of the University of Wisconsin-Milwaukee for use of their stopped-flow and FPLC chromatography systems, respectively, and to John Coates from the University of California-Berkeley for providing the WM3064 cells. JMM also wished to thank her colleagues in the laboratory, particularly Karl Koebke and Matthew Youngblut, for helpful discussions and much practical advice.
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McGarry, J.M., Pacheco, A.A. Upon further analysis, neither cytochrome c554 from Nitrosomonas europaea nor its F156A variant display NO reductase activity, though both proteins bind nitric oxide reversibly. J Biol Inorg Chem 23, 861–878 (2018). https://doi.org/10.1007/s00775-018-1582-4
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DOI: https://doi.org/10.1007/s00775-018-1582-4