Abstract:
:A new myoglobin, reconstituted with a modified zinc protoporphyrin, having a total of four ammonium groups at the terminal of the two propionate side chains was constructed to introduce a substrate binding site. The protein with a positively charged patch on the surface formed a stable complex with negatively charged substrates, such as hexacyanoferrate(III) and anthraquinonesulfonate via an electrostatic interaction. The complexation was monitored by fluorescence quenching due to singlet electron transfer from the photoexcited reconstituted zinc myoglobin to the substrates. The binding properties were evaluated by Stern-Volmer plots from the fluorescence quenching of the zinc myoglobin by a quencher. Particularly, anthraquinone-2,7-disulfonic acid showed a high affinity with a binding constant of 1.5 x 10(5) M(-1) in 10 mM phosphate buffer, pH 7.0. In contrast, the plots upon the addition of anthraquinone-2-sulfonic acid at different ionic strengths indicated that the complex was formed not only by an electrostatic interaction but also by a hydrophobic contact. The findings from the fluorescence studies conclude that the present system is a useful model for discussion of electron transfer via non-covalently linked donor-acceptor pairing on the protein surface.
journal_name
J Inorg Biochemjournal_title
Journal of inorganic biochemistryauthors
Hayashi T,Ando T,Matsuda T,Yonemura H,Yamada S,Hisaeda Ydoi
10.1016/s0162-0134(00)00153-7subject
Has Abstractpub_date
2000-11-01 00:00:00pages
133-9issue
1-4eissn
0162-0134issn
1873-3344pii
S0162-0134(00)00153-7journal_volume
82pub_type
杂志文章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,...
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2020-07-01 00:00:00
abstract::When pulsed cytochrome c oxidase is exposed to carbon monoxide in the absence of oxygen the enzyme is converted quickly to its CO-associated mixed valence state. The half-time for this reaction at 0 degree C is about 4 min. This is about 100 times faster than a similar reaction which begins with the resting form of th...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(85)85038-8
更新日期:1985-03-01 00:00:00
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 s...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2006.05.007
更新日期:2006-09-01 00:00:00
abstract::This communication presents synthesis and spectral characterization of metalloporphyrin [Zn(X)TMPyP4] (TMPyP4 is 5,10,15,20-tetrakis (N-methylpyridinium-4-yl)porphyrin), and studies its binding onto anionic surface sites of synthetic double stranded polynucleotide Poly(A)-Poly(U). [Zn(X)TMPyP4] binding with Poly(A)-Po...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2016.05.004
更新日期:2016-08-01 00:00:00
abstract::The strength of inhibition of beta-hematin (synthetic hemozoin or malaria pigment) formation by the quinoline antimalarial drugs chloroquine, amodiaquine, quinidine and quinine has been investigated as a function of incubation time. In the assay used, beta-hematin formation was brought about using 4.5M acetate, pH 4.5...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2005.04.013
更新日期:2005-07-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2018.11.015
更新日期:2019-02-01 00:00:00
abstract::Bis(picolinato)oxovanadium(IV) [VO(pic)2] is one of the most potent insulin-mimetic vanadium complexes. To probe coordination structural changes of this complex in vivo and provide insights into the origin of its high potency, an electron spin-echo envelope modulation (ESEEM) study was performed on organs (kidney, liv...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(99)00204-4
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abstract::The solvent effect on the acid-base and complexation behavior of the homopolynucleotide polyuridylic acid (poly(U)) has been studied by means of potentiometric and spectrometric titrations (circular dichroism and UV-VIS) in water and in 30 and 50% (v/v) dioxane-water media. The potentiometric studies revealed the abse...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(95)00211-1
更新日期:1996-08-15 00:00:00
abstract::Metallothioneins are small cysteine-rich proteins believed to play a role, among others, in the homeostasis of essential metal ions such as Zn(II) and Cu(I). Recently, we could show that wheat E(c)-1 is coordinating its six Zn(II) ions in form of metal-thiolate clusters analogously to the vertebrate metallothioneins. ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2008.11.008
更新日期:2009-03-01 00:00:00
abstract::The CuA center is a dinuclear Cu2S2(Cys) electron transfer center found in cytochrome c oxidase and nitrous oxide reductase. In a previous investigation of the equatorial histidine ligands' effect on the reduction potential, electron transfer and spectroscopic properties of the CuA center, His120 in the engineered CuA...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(99)00214-7
更新日期:2000-01-15 00:00:00
abstract::A group of Piloty's acid (N-hydroxybenzenesulfonamide) derivatives were synthesized and fully characterized in order to assess the rates and pH of HNO (azanone, nitroxyl) donation in aqueous media. The derivatives, with electron-withdrawing and -donating substituents include methyl, nitro, fluoro, tri-isopropyl, trifl...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2012.10.008
更新日期:2013-01-01 00:00:00
abstract::Quaternary systems of copper(II) complexes with adenosine 5'-triphosphate, O-phospho L-serine and with equimolar or excessive amount of spermine have been investigated. The studies have been performed in aqueous solution. Types of complexes and the overall stability constants have been determined using the potentiomet...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2010.04.006
更新日期:2010-08-01 00:00:00
abstract::Cadmium ions applied to either (outer or inner) surface of the isolated toad skin dose-dependently increased the short-circuit current (SCC), the potential difference (V) and the active sodium conductance (G(Na)) in the concentration range 0.07-0.50mM. Maximal stimulatory effect was over 30% with an EC(50) of about 0....
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2005.09.003
更新日期:2005-12-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
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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
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更新日期:2011-03-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2015.04.006
更新日期:2015-12-01 00:00:00
abstract::The interactions between the nucleotides: adenosine-5'-diphosphate (ADP) and adenosine-5'-triphosphate (ATP) with spermine (Spm) and 1,11-diamine-4,8-diazaundecane (3,3,3-tet), as well as Cu(II) ions are studied. In the metal-free systems nucleotide-polyamine molecular complexes have been found to form, in which the i...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(03)00150-8
更新日期:2003-08-01 00:00:00
abstract::The interaction of Co(III) and Co(II) cobalamin (Cbl) and cobinamide (Cbi) with thiocyanate was examined with UV-vis and EPR spectra. S/N-linkage isomerism was explored on Co(III) and Co(II) Cbl and Cbi models using density functional theory (DFT; BP86, B3LYP). Performed calculations suggest the prevalence of isothioc...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2013.04.011
更新日期:2013-08-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2015.07.017
更新日期:2015-12-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2013.04.003
更新日期:2013-08-01 00:00:00
abstract::Preparation of metal/protein hybrids is growing into important topics in the field of bioinorganic chemistry. X-ray crystal structure analyses of them provide direct information on unique interactions of metal cations or metal cofactors to understand and design enzymatic functions. In this mini review, the authors foc...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章,评审
doi:10.1016/j.jinorgbio.2007.06.025
更新日期:2007-11-01 00:00:00
abstract::The interaction of phytic acid with Ca(II) has been studied by potentiometric titration and by measurement of free Ca(II) concentrations using an ion Selective electrode. With increasing Ca(II) concentration, the titration curve of phytic acid is displaced to regions of lower pH. In the binding of calcium ions to phyt...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(86)80105-2
更新日期:1986-05-01 00:00:00
abstract::Studies of complexation equilibria of the antibiotic anions nalidixate and cinoxacinate with [Cu(phen)]2+ and [Cu(bipy)]2+ are reported. These studies indicate that the stability of this type of complex is strongly related to the metal environment. A correlation between the stability constants, determined here, with t...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(96)00041-4
更新日期:1996-11-15 00:00:00
abstract::Four amino acids--alanine, 2,3-diaminopropionic acid, cystine, and cystein--and also one diamine, ethylenediamine, were chelated with 99m-technetium (99mTc), and their renal excretion patterns were studied in rabbits in the presence and absence of two renal tubular transport inhibitors, probenecid and 2,4-dinitropheno...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(88)85015-3
更新日期:1988-09-01 00:00:00
abstract::Aurothiomalate (AuTm) is an old, clinically established, antiarthritic gold drug that is currently being reconsidered as a candidate drug for cancer treatment and for other therapeutic indications within a more general drug repositioning program. As the biological effects of gold drugs seem to be mediated, mainly, by ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2015.03.013
更新日期:2015-08-01 00:00:00
abstract::The reaction of human ceruloplasmin and anion treated ceruloplasmin with diethyldithiocarbamate was studied at pH 5.5. The analysis of optical and EPR spectra at 9 GHz showed that ceruloplasmin contains five paramagnetic copper ions, two of which, X and Y, not involved in enzymatic activity, are chelated by diethyldit...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(85)80020-9
更新日期:1985-10-01 00:00:00
abstract::Gold(III) complexes bearing bidentate ligands based on the 1,10-phenanthroline and 2,2'-bipyridine scaffolds have shown promising anticancer activity against a variety of tumor cell lines. In particular, our laboratory has previously found that a pseudo five coordinate gold(III) complex possessing the 2,9-di-sec-butyl...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2014.08.014
更新日期:2014-12-01 00:00:00