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Volumn 129, Issue 43, 2007, Pages 13127-13136

Electronic structure of the peroxy intermediate and its correlation to the native intermediate in the multicopper oxidases: Insights into the reductive cleavage of the O-O bond

Author keywords

[No Author keywords available]

Indexed keywords

MULTICOPPER OXIDASES; PEROXIDE BRIDGES; PEROXY INTERMEDIATE; REDUCTIVE CLEAVAGE;

EID: 35848965478     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja073947a     Document Type: Article
Times cited : (68)

References (68)
  • 42
    • 35848964925 scopus 로고    scopus 로고
    • Gaussian, Inc, Pittsburgh, PA
    • Frisch, M. J.; et al. Gaussian 03, revision C.01; Gaussian, Inc.: Pittsburgh, PA, 2004.
    • (2004) Gaussian 03, revision , Issue.C.01
    • Frisch, M.J.1
  • 45
    • 35848955543 scopus 로고    scopus 로고
    • Tenderholt, A. PyMOlyze, ver. 1.5; Stanford University: Stanford, CA, 2006
    • Tenderholt, A. PyMOlyze, ver. 1.5; Stanford University: Stanford, CA, 2006.
  • 47
    • 35848942032 scopus 로고    scopus 로고
    • An additional geometry optimization on the μ3-1,1,2-O 22--bridged PI structure was performed with a larger basis set, with triple-ζ 6-311G* on Cu and coordinated N/O atoms and 6-31G* on the rest, to verify that the structures obtained in this study with the double-ζ quality basis set, with 6-31G* on Cu and coordinated N/O atoms and 3-21G* on the rest, are sound. As a result, it is found that the overall structure of PI remains the same and the geometric parameters are very similar to those obtained with the double-ζ basis set, as indicated in Table 1
    • 2--bridged PI structure was performed with a larger basis set, with triple-ζ 6-311G* on Cu and coordinated N/O atoms and 6-31G* on the rest, to verify that the structures obtained in this study with the double-ζ quality basis set, with 6-31G* on Cu and coordinated N/O atoms and 3-21G* on the rest, are sound. As a result, it is found that the overall structure of PI remains the same and the geometric parameters are very similar to those obtained with the double-ζ basis set, as indicated in Table 1.
  • 49
    • 35848942711 scopus 로고    scopus 로고
    • These energies are based on calculations using B3LYP functional with 6-3IG* basis set on Cu and coordinated N/O atoms and 3-21G* basis set on the rest.
    • These energies are based on calculations using B3LYP functional with 6-3IG* basis set on Cu and coordinated N/O atoms and 3-21G* basis set on the rest.
  • 55
    • 35848946905 scopus 로고    scopus 로고
    • -1).
    • -1).
  • 56
    • 35848931785 scopus 로고    scopus 로고
    • -1) quenches the fluorescence in this region, allowing the resonance Raman spectrum to be obtained.
    • -1) quenches the fluorescence in this region, allowing the resonance Raman spectrum to be obtained.
  • 57
    • 35848942923 scopus 로고    scopus 로고
    • Unpublished results
    • Unpublished results.
  • 58
    • 35848947327 scopus 로고    scopus 로고
    • To compare the energy difference between the direct proton transfer from a proton donor to a proton acceptor and the indirect proton transfer via a water molecule, we have modeled the proton-transfer process between a formate ion and a formic acid at the B3LYP/6-31++G** level. As a result, energy barriers for the proton-transfer process directly between a formate and a formic acid and that mediated by a water molecule were estimated with relatively similar values of ∼7.9 and ∼12.0 kcal/mol, respectively, The distance between O atoms accepting and donating the proton was fixed at 2.80 Å. See Figures S2, S3 and figure legends for details of the calculations
    • To compare the energy difference between the direct proton transfer from a proton donor to a proton acceptor and the indirect proton transfer via a water molecule, we have modeled the proton-transfer process between a formate ion and a formic acid at the B3LYP/6-31++G** level. As a result, energy barriers for the proton-transfer process directly between a formate and a formic acid and that mediated by a water molecule were estimated with relatively similar values of ∼7.9 and ∼12.0 kcal/mol, respectively. (The distance between O atoms accepting and donating the proton was fixed at 2.80 Å. See Figures S2, S3 and figure legends for details of the calculations.)
  • 59
    • 35848950110 scopus 로고    scopus 로고
    • Note that three possible broken-symmetry states, with |βαα, αβα, and |ααβ) spin configurations, have very similar energies and contribute equivalently to the spin-frustrated ground state of NI.28 Thus, while the |βαα) spin configuration contributes significantly in me early stage of O-O bond cleavage which includes the transition state, vide infra, the other two spin configurations become equally important as all three Cu centers in the trinuclear cluster become oxidized
    • 28 Thus, while the |βαα) spin configuration contributes significantly in me early stage of O-O bond cleavage (which includes the transition state, vide infra), the other two spin configurations become equally important as all three Cu centers in the trinuclear cluster become oxidized.
  • 60
    • 35848930249 scopus 로고    scopus 로고
    • As indicated in footnote 58, the energy barrier in the proton-transfer process is estimated to be higher when it is mediated by a water molecule. However, the relative stability of PI+e+H, compared to that of PI+e, can provide enough thermodynamic driving force to make the energy barrier in the proton-transfer process still small relative to the overall transition-state energy.
    • As indicated in footnote 58, the energy barrier in the proton-transfer process is estimated to be higher when it is mediated by a water molecule. However, the relative stability of PI+e+H, compared to that of PI+e, can provide enough thermodynamic driving force to make the energy barrier in the proton-transfer process still small relative to the overall transition-state energy.
  • 62
    • 0004052075 scopus 로고
    • Oxford University Press: New York
    • Sawyer, D. T. Oxygen Chemistry; Oxford University Press: New York, 1991.
    • (1991) Oxygen Chemistry
    • Sawyer, D.T.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.