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1 n both forms of the enzyme, the radical is a flavin semiquinone.
2 d with the oxidation of FMN to give a stable flavin semiquinone.
3 R spectroscopy confirms the formation of the flavin semiquinone.
4  spectra suggested the presence of a neutral flavin semiquinone.
5 ormation of the triplet diradical complex of flavin semiquinone and (*)OOH.
6                        MTOX forms an anionic flavin semiquinone and a reversible, covalent flavin-sul
7              The lack of dissociation of the flavin semiquinone and chorismate from the enzyme appear
8 tribute to the relative stabilization of the flavin semiquinone and may be at least partially respons
9 in-reducing catalysis, ionization of the bcd flavin semiquinone and the appearance of a charge transf
10  sites was reduced to its respective anionic flavin semiquinone and used for measuring inter-flavin d
11 r signal revealed an intriguing interplay of flavin semiquinones and a protein conformational change
12  a spectral intermediate characteristic of a flavin semiquinone, and all reduced enzyme species could
13 on reduced active P450BM3 is formed with two flavin semiquinones, anionic and neutral, present simult
14 eduction state does not exceed two, with two flavin semiquinones, anionic and neutral, present.
15 duct, but only small amounts of intermediate flavin semiquinone are observed during reductive titrati
16 hydroquinone as a single electron reductant, flavin semiquinone as the hydrogen atom source, and the
17 vin in PyrDb, by iron-sulfur centers through flavin semiquinones as intermediates.
18 e that the presence of a short-lived anionic flavin semiquinone (ASQ) is not sufficient to infer the
19 the formed protonated superoxide and anionic flavin semiquinone at N5, before elimination of water af
20 or betaine aldehyde were consistent with the flavin semiquinone being not involved in catalysis.
21  increase the thermodynamic stability of the flavin semiquinone by 10-fold relative to the semiquinon
22 irectly affects the stability of the neutral flavin semiquinone by facilitating a strong and critical
23 ) CM(-)(1)) due to the presence of a neutral flavin semiquinone, can then be quantitatively reconstru
24                          Measurements of the flavin semiquinone content, rate constant for NADPH rele
25 ogen-bonding interaction that stabilizes the flavin semiquinone, contributing to the low potential of
26 strate-dependent accumulation of the neutral flavin semiquinone during both the flavoenzyme reduction
27 evidence for the presence of a neutral, blue flavin semiquinone during the reduction.
28  dithionite-dependent transient formation of flavin semiquinone during turnover of (6S)-6-fluoro-EPSP
29 an allylic radical intermediate in which two flavin semiquinones each abstract one hydrogen atom from
30 as coupling to the two 2Fe-2S centers or the flavin semiquinone evident.
31 e dark state and photoreduced to the neutral flavin semiquinone (FADH degrees ) in its lit state.
32 NADH reduction of FdsBG identified a neutral flavin semiquinone, FMNH(*), not previously observed to
33 d in the oxidized enzyme, whereas an anionic flavin-semiquinone has been reported in the reduced enzy
34 l hydroquinone, with no stabilization of the flavin semiquinone; in contrast, the anionic semiquinone
35                                Blue, neutral flavin semiquinone is also generated in high yields duri
36 becoming broadened beyond detection when the flavin semiquinone is formed.
37 characterization of both anionic and neutral flavin semiquinone is presented.
38                First, electrons from the ETF flavin semiquinone may enter the ETF-QO flavin one by on
39 one/quinone redox couple, where ground-state flavin semiquinone provides the electron for substrate r
40 udies indicate the reaction proceeds via the flavin semiquinone/quinone redox couple, where ground-st
41 dithionite first produces some neutral, blue flavin semiquinone radical and, finally, fully reduced F
42 We have characterized the nNOS heme iron and flavin semiquinone radical by electron paramagnetic reso
43 y different relaxation behavior and a stable flavin semiquinone radical identified by EPR as a neutra
44  protein as isolated contained an air-stable flavin semiquinone radical that was sensitive to FeCN6 o
45 [2Fe-2S] cluster and to FMN in the form of a flavin semiquinone radical.
46                             A stable neutral flavin-semiquinone radical is observed in the air-oxidiz
47                                    A neutral flavin-semiquinone radical is observed in the oxidized e
48 ite-reduced enzyme exhibits a stable anionic flavin-semiquinone radical.
49 ed reductase domain with NADPH indicated the flavin semiquinone re-formed after addition of 1-electro
50 constant of at least 72,000 M-1 s-1, whereas flavin semiquinone reduces oxygen to form superoxide as
51  the E(246)L variant, resulting in a reduced flavin semiquinone species and superoxide (O(2)(*)-) dur
52                   In each case, blue neutral flavin semiquinone species are stabilized on both flavin
53  along with the stabilization of the neutral flavin semiquinone, suggests the presence of a weak posi
54  destabilization of the one-electron-reduced flavin semiquinone that is differentially expressed in t
55 he formation of the blue neutral form of the flavin semiquinone, that of the semiquinone-hydroquinone
56 he catalytic cycle is electron transfer from flavin semiquinone to b2-heme.
57 ave been devised to convert the enzyme-bound flavin semiquinone to oxidized FAD and vice versa, allow
58 fficult to achieve complete reduction of the flavin semiquinone to the hydroquinone.
59 lective delivery of a hydrogen atom from the flavin semiquinone to the prochiral radical formed after
60                                           No flavin semiquinone was observed during potentiometric ti
61                     The enzyme-bound anionic flavin semiquinone was unusually insensitive to oxygen o
62 l may arise from a single, extremely stable, flavin semiquinone, which becomes deprotonated upon redu
63 % thermodynamic stabilization of the anionic flavin semiquinone, while no detectable amount of semiqu
64 elevant reduced form of enzyme is an anionic flavin semiquinone, whose formation requires the substra
65                      The neutral form of the flavin semiquinone, with maxima at 536 and 342 nm, is ki