Abstract:
:A laccase from the fungus Trametes villosa (TviL) was investigated in order to elucidate the reaction mechanism of the reduction of dioxygen to water performed by this blue multi-copper oxidase. The ability of TviL to activate dioxygen was studied by stopped-flow experiments and under steady-state conditions. In the stopped-flow experiments TviL was reduced with a small excess of 4-hydroxyphenylacetic acid and afterwards the re-oxidation process was monitored by stopped-flow techniques by mixing with excess dioxygen. The reaction between reduced TviL and dioxygen was studied in the temperature range 10-35 degrees Celsius and with the concentration of dioxygen between 30 and 240microM. The observed rate constant k(obs) is found to be linear dependent on the dioxygen concentration and the observed second-order rate constant for the re-oxidation of reduced TviL is, at 25 degrees Celsius, determined to be 1.14x10(6)M(-1)s(-1). The activation energy, E(a), is from the same data determined to be 22kJmol(-1). Oxidation of different phenols (4-hydroxyphenylacetic acid, 4-hydroxybenzoic acid, guaiacolsulfonic acid and hydroquinone) under steady state conditions was investigated at concentrations of dioxygen ranging from 60 to 250microM. This line of experiments showed that TviL follows a ping-pong mechanism, and an observed second-order rate constant for the reaction with dioxygen of 7.1x10(5)M(-1)s(-1) at 25 degrees Celsius was found with 4-hydroxyphenylacetic acid as reducing substrate. The two kinetic methods resulted in observed rate constants of equal magnitudes for the reaction with dioxygen, which suggests that the rate limiting step(s) is (are) included in both the reactions studied by the two different techniques.
journal_name
J Inorg Biochemjournal_title
Journal of inorganic biochemistryauthors
Bukh C,Lund M,Bjerrum MJdoi
10.1016/j.jinorgbio.2006.05.007subject
Has Abstractpub_date
2006-09-01 00:00:00pages
1547-57issue
9eissn
0162-0134issn
1873-3344pii
S0162-0134(06)00156-5journal_volume
100pub_type
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章,评审
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journal_title:Journal of inorganic biochemistry
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journal_title:Journal of inorganic biochemistry
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journal_title:Journal of inorganic biochemistry
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
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journal_title:Journal of inorganic biochemistry
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doi:10.1016/j.jinorgbio.2008.09.008
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2008.11.002
更新日期:2009-03-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章,评审
doi:10.1016/j.jinorgbio.2005.11.005
更新日期:2006-05-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2010.02.005
更新日期:2010-06-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(96)00216-4
更新日期:1997-06-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2011.12.010
更新日期:2012-07-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2014.08.014
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journal_title:Journal of inorganic biochemistry
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2004.02.021
更新日期:2004-06-01 00:00:00
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pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2009.06.003
更新日期:2009-08-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2009.05.006
更新日期:2009-07-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2008.06.012
更新日期:2008-10-01 00:00:00
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pub_type: 杂志文章
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2009.01.020
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
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更新日期:2005-05-01 00:00:00
abstract::In heme peroxidases, a distal His residue plays an essential role in the initial two electron oxidation of resting state enzyme to compound I by hydrogen peroxide. A distal Arg residue assists in this process. The contributions of the charge, H-bonding capacity, size, and mobility of this Arg residue to Coprinus ciner...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2006.10.007
更新日期:2007-02-01 00:00:00
abstract::The binding of lanthanide(III) ions to human serum apotransferrin has been investigated through 1H NMR spectroscopy. Several well resolved isotropically shifted signals have been observed between 100/-100 ppm for the Tm, Tb, Yb and Dy derivatives. Significant spectroscopic inequivalence of the two metal binding sites ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(91)84004-s
更新日期:1991-05-15 00:00:00
abstract::The crystal structure of 14alpha-sterol demethylase from Mycobacterium tuberculosis (MTCYP51) [Proc. Natl. Acad. Sci. USA 98 (2001) 3068-3073] provides a template for analysis of eukaryotic orthologs which constitute the CYP51 family of cytochrome P450 proteins. Putative substrate recognition sites (SRSs) were identif...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(01)00388-9
更新日期:2001-12-15 00:00:00
abstract::The non-covalent interaction of the complexes [Pt(bpy)(R,R'NCSNR'',R''')(2)]Cl(2) (bpy=2,2'-bipyridine; R=R'=R''=R'''=H; R=Me, R'=R''=R'''=H; R=n-Bu, R'=R''=R'''=H; R=p-tolyl, R'=R''=R'''=H; R=Et, R'=H, R''=Et, R'''=H) with calf thymus DNA has been studied at pH 7 and 25 degrees C. The processes give rise to: (i) reve...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2004.11.002
更新日期:2005-02-01 00:00:00
abstract::A set of new copper(II) complexes containing the Schiff base ligand derived from pyridine-2-carboxaldehyde and 5,6-diamino-1,3-dimethyluracil (6-amino-1,3-dimethyl-5-[(pyridin-2-ylmethylidene)-amino]-pyrimidine-2,4(1H,3H)-dione) with several anions (Cl-, Br-, I-, ClO4-, NO3-) and, two of them with 1,10-phenanthroline,...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2020.111053
更新日期:2020-06-01 00:00:00