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231224s2016 xx |||||o 00| ||eng c |
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|a 10.1002/jcc.24396
|2 doi
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|a pubmed24n0866.xml
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|a (DE-627)NLM259886238
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|a (NLM)27130561
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Blomberg, Margareta R A
|e verfasserin
|4 aut
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|a Improved free energy profile for reduction of NO in cytochrome c dependent nitric oxide reductase (cNOR)
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|c 2016
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 24.07.2018
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|a Date Revised 24.07.2018
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2016 Wiley Periodicals, Inc.
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|a Quantum chemical calculations play an essential role in the elucidation of reaction mechanisms for redox-active metalloenzymes. For example, the cleavage and the formation of covalent bonds can usually not be described only on the basis of experimental information, but can be followed by the calculations. Conversely, there are properties, like reduction potentials, which cannot be accurately calculated. Therefore, computational and experimental data has to be carefully combined to obtain reliable descriptions of entire catalytic cycles involving electron and proton uptake from donors outside the enzyme. Such a procedure is illustrated here, for the reduction of nitric oxide (NO) to nitrous oxide and water in the membrane enzyme, cytochrome c dependent nitric oxide reductase (cNOR). A surprising experimental observation is that this reaction is nonelectrogenic, which means that no energy is conserved. On the basis of hybrid density functional calculations a free energy profile for the entire catalytic cycle is obtained, which agrees much better with experimental information on the active site reduction potentials than previous ones. Most importantly the energy profile shows that the reduction steps are endergonic and that the entire process is rate-limited by high proton uptake barriers during the reduction steps. This result implies that, if the reaction were electrogenic, it would become too slow when the gradient is present across the membrane. This explains why this enzyme does not conserve any of the free energy released. © 2016 Wiley Periodicals, Inc
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a catalytic reaction mechanisms
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|a density functional theory
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|a free energy profiles
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|a redox-active metalloenzymes
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|a reduction potentials
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|a Nitric Oxide
|2 NLM
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|a 31C4KY9ESH
|2 NLM
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|a Cytochromes c
|2 NLM
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|a 9007-43-6
|2 NLM
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|a Oxidoreductases
|2 NLM
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|a EC 1.-
|2 NLM
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|a nitric-oxide reductase
|2 NLM
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| 650 |
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|a EC 1.7.2.5
|2 NLM
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|a Siegbahn, Per E M
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of computational chemistry
|d 1984
|g 37(2016), 19 vom: 15. Juli, Seite 1810-8
|w (DE-627)NLM098138448
|x 1096-987X
|7 nnns
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| 773 |
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|g volume:37
|g year:2016
|g number:19
|g day:15
|g month:07
|g pages:1810-8
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|u http://dx.doi.org/10.1002/jcc.24396
|3 Volltext
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