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Volumn 126, Issue 28, 2004, Pages 8842-8855

Nature of the peroxo intermediate of the W48F/D84E ribonucleotide reductase variant: Implications for O2 activation by binuclear non-heme iron enzymes

Author keywords

[No Author keywords available]

Indexed keywords

ACTIVATION ANALYSIS; COMPLEXATION; COMPUTATIONAL GEOMETRY; CONSTRAINT THEORY; COORDINATION REACTIONS; ELECTROCHEMISTRY; ELECTRONIC STRUCTURE; ENZYMES; IRON COMPOUNDS; MATHEMATICAL MODELS; OPTIMIZATION;

EID: 3242684036     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja049106a     Document Type: Article
Times cited : (81)

References (84)
  • 38
    • 3242659433 scopus 로고    scopus 로고
    • note
    • Geometry convergence criteria were as follows: change in total energy, ΔE < 5e-5 Hartrees, maximum local energy gradient, δE/δS < 4.5e-4 Hartrees/Å, δE/δS(RMS) < 3e-4 Hartrees/Å, ΔS < 1.8e-3 Å, ΔS(RMS) < 1.2e-5 Å. Frequency calculations to verify that true minima had been attained were not possible as Jaguar 4.1 and subsequent Jaguar 5.0 have not implemented parallelized analytical frequency determination. Such calculations will be performed once this functionality has been added.
  • 39
    • 3242713570 scopus 로고    scopus 로고
    • note
    • The residue truncation was performed as follows; the α-carbon was replaced by a hydrogen atom with concommitent shortening of the α-C-β-C bond to 1.08 Å, with the β-C retaining its original position. This hydrogen was then frozen in all geometry optimizations.
  • 40
    • 3242728932 scopus 로고    scopus 로고
    • note
    • -. The positions of the heavy atoms (C, N, O) were frozen along with the positions of hydrogens replacing carbon atoms. Q43 and Q87 were modeled differently (as formamide and ammonia, respectively) as the R-group nitrogen of Q43 was located 2.8 Å from a carboxylate oxygen on D237 suggesting hydrogen bonding between these two residues which may have been of importance to the geometry of the active site. W/F48 residue, the second mutation from wt, was not included in the model as it does not coordinate to either iron or iron-coordinated residues.
  • 41
    • 3242700022 scopus 로고    scopus 로고
    • note
    • 2-) by the D84E mutation and the introduction of a water molecule which is coordinated to E84 in the mutant.
  • 59
    • 3242689224 scopus 로고    scopus 로고
    • note
    • * for π-overlap with the metal.
  • 61
    • 3242728072 scopus 로고    scopus 로고
    • note
    • The uncertainty in the percentage peroxo donation decrease is due to uncertainty in the extinction coefficient of the protein peroxo intermediate. This is due to the difficulty of calculating the proportion of a short-lived intermediate accumulated at any moment during a stopped flow experiment.
  • 62
    • 3242690124 scopus 로고    scopus 로고
    • note
    • Fe-O values (Table 1). However, a 5° change in the Fe(2)-O-O bond angle (within anticipated error of the geometry optimized model) changes the stretching force constants required to fit the experimental data by ∼0.1 mdyne/Å.
  • 63
    • 3242729799 scopus 로고    scopus 로고
    • note
    • Fel-based unoccupied 3d-orbitals are shown, Fe2-centered are similar (<5% difference) and are found in the Supporting Information.
  • 64
    • 3242680111 scopus 로고    scopus 로고
    • note
    • 2 relative to when the effector protein, MMOB, is also present. Thus, the structure of the reactive biferrous MMO species remains unknown.
  • 66
    • 0003899626 scopus 로고
    • Valentine, J. S., Foote, C. S., Greenberg, A., Liebman, J. F., Eds.; Blackie Academic & Professional: Glasgow
    • Fox, S.; Karlin, K. D. In Active Oxygen in Biochemistry; Valentine, J. S., Foote, C. S., Greenberg, A., Liebman, J. F., Eds.; Blackie Academic & Professional: Glasgow, 1995.
    • (1995) Active Oxygen in Biochemistry
    • Fox, S.1    Karlin, K.D.2
  • 70
    • 3242666500 scopus 로고    scopus 로고
    • note
    • A broad doublet at ∼0.3 and 0.8 mm/s and a sharper doublet at ∼ -0.3 and 1.2 mm/s.
  • 71
    • 3242676488 scopus 로고    scopus 로고
    • note
    • A low intensity peak at ∼500 nm (ε < 100/M/cm).
  • 75
    • 3242728071 scopus 로고    scopus 로고
    • note
    • Q =0.55 mm/s, δ = 0.43 mm/s).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.