Abstract:
:The effect of Cu(II), Ni(II), Zn(II), Mg(II), and Mn(II) on the fluorescence of porcine kidney cytosol leucine aminopeptidase and three of its dansyl(Dns) peptide substrates, Leu-Gly-NHNH-Dns, Leu-Gly-NH(CH2)2NH-Dns, and Leu-Gly-NH(CH2)6NH-Dns, has been investigated. These five metal ions were chosen for study because each binds to the regulatory metal binding site of leucine aminopeptidase. Since the binding is relatively weak, kinetic studies of the different metalloderivatives of the enzyme are normally carried out in the presence of large molar excesses of these metal ions that can potentially affect both the enzyme and substrate. The fluorescence of all of the dansyl-peptides, as well as several other dansyl species, is quenched by Ni(II) and Cu(II), but not by Mg(II), Mn(II), or Zn(II). The absorption spectra of these dansyl substrates are also perturbed by Ni(II) and Cu(II). The rate at which maximal quenching for some dansyl species is attained after mixing with Ni(II) and Cu(II) is slow and the quenching is reversed on addition of EDTA. These results indicate that the quenching is the result of complex formation between the fluorophores and these metal ions. The association constants for the metal complexes have been determined from Stern-Volmer plots. In addition to complex formation, Ni(II) and Cu(II) cause the degradation of Leu-Gly-NHNH-Dns through a two step mechanism involving loss of dansic acid. Ni(II) and Cu(II) also partially quench the fluorescence of leucine aminopeptidase through contact with its surface accessible Trp residues. These observations indicate that care must be taken in stopped flow fluorescence studies of reactions between this enzyme and its dansyl substrates to avoid adverse effects brought about by Ni(II) and Cu(II).
journal_name
J Inorg Biochemjournal_title
Journal of inorganic biochemistryauthors
Lin WY,Van Wart HEdoi
10.1016/0162-0134(88)80013-8subject
Has Abstractpub_date
1988-01-01 00:00:00pages
21-38issue
1eissn
0162-0134issn
1873-3344pii
0162-0134(88)80013-8journal_volume
32pub_type
杂志文章abstract::Synthetic, structural and biochemical aspects of some organoboron complexes of sulphur containing ligands having ONS and SNNS donor systems have been described. The ligands were prepared by the condensation of 1-phenyl-1,3-butanedione, 2,4-pentanedione, diphenylethanedione, 2,3-butanedione, ethanedial and 1,4-benzened...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(90)84007-c
更新日期:1990-07-01 00:00:00
abstract::Synthetic and spectroscopic studies of the Hg(II) and MeHg(II) complexes of azathioprine (AZA), a biologically active 6-mercaptopurine derivative, were undertaken. The altered coordination behavior of AZA with respect to the parent mercaptopurine, with sulfur no longer being the primary donor atom, was confirmed. As c...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(94)85021-6
更新日期:1994-08-15 00:00:00
abstract::The synthesis and characterization of four palladium(II) complexes with substituted salicylaldehydes (X-saloH) having the general formula [Pd(X-salo)2] was undertaken. The complexes are formulated as [Pd(3-OCH3-salo)2] 1, [Pd(5-NO2-salo)2] 2, [Pd(5-Cl-salo)2] 3, and [Pd(5-Br-salo)2] 4. The structure of complex 1 was v...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2019.02.013
更新日期:2019-05-01 00:00:00
abstract::Fusobacterium nucleatum is an anaerobic, Gram-negative bacteria linked to colon cancer. It is interesting to determine how metal ions interact with bacterial adhesin proteins. To this end, the coordination of ATDAAS-NH2 and MKKFL-NH2 fragments of Fusobacterium adhesin A (FadA) to copper(II) ions was studied by potenti...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2018.09.012
更新日期:2018-12-01 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::The resonance Raman spectra of native stellacyanin and its Ni(II) derivative has been investigated. Raman intensity as a function of the exciting frequency shows minima at about 440--460 nm. Moreover, the resonance Raman spectra of the Ni(II) derivative indicate similar symmetry and nature of ligands, namely, one cyst...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(85)83012-9
更新日期:1985-02-01 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::Rat liver metallothionein contains two domains, each of which enfolds a separate metal-thiolate cluster. The binding stoichiometry of these clusters depends on the particular metal ion bound. In the aminoterminal beta domain the cluster can accommodate either three Cd(II) ions or six Cu(I) ions. The Cd ions are known ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(86)80062-9
更新日期:1986-07-01 00:00:00
abstract::Two macrocycles (1 and 2) are prepared that incorporate pendent groups in macrocycle 3 (3=1-oxa-4,7,10-triazacyclododecane) with the goal of studying the effect of these pendent groups on metal ion complexation, solution chemistry and catalysis. Zn(1) contains a macrocyclic ligand with a pendent acridine group and Zn(...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2007.03.002
更新日期:2007-06-01 00:00:00
abstract::The pH- and time-dependent reactions of the anticancer drug cisplatin, cis-[PtCl(2)(NH(3))(2)], with the peptides Ac-Gly-Met-Gly-OH, Ac-Ser-Met-OH and Ac-Met-His-OH (Gly=glycyl, Met=methionyl, Ser=seryl, His=histidyl) at 313 K have been investigated by high-performance liquid chromatography, nuclear magnetic resonance...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2004.08.016
更新日期:2004-11-01 00:00:00
abstract::Palladium(II) complexes of 2-benzoylpyridine thiosemicarbazone (H2Bz4DH) and its N4-methyl (H2Bz4M) and N4-phenyl (H2Bz4Ph) derivatives were obtained and fully characterized. [Pd(2Bz4DH)Cl] (1) crystallizes in the monoclinic space group P21/c with a=11.671(1), b=10.405(1), c=13.124(1), beta=115.60(1) degrees and Z=4; ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2004.11.022
更新日期:2005-03-01 00:00:00
abstract::Non-small cell lung cancer (NSCLC) is the most common cancer worldwide, which is related with poor prognosis and resistance to chemotherapy. Notably, ruthenium-based complexes have emerged as good alternative to the currently used platinum-based drugs for cancer therapy. In the present study, we synthesized a novel bi...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2019.01.019
更新日期:2019-05-01 00:00:00
abstract::In order to develop in vitro methods as an alternative to P450 animal testing in the drug discovery process, two main requisites are necessary: 1) gathering of data on animal homologues of the human P450 enzymes, currently very limited, and 2) bypassing the requirement for both the P450 reductase and the expensive cof...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2012.05.017
更新日期:2012-12-01 00:00:00
abstract::A previous publication [Frenkel, Cain, and Chao, Biochem. Biophys. Res. Commun. 127, 849-856 (1985)] described the observation that double-stranded DNA which was briefly exposed to methyl mercury (MeHg) and purified to remove free methyl mercury was transcribed at a higher rate by RNA polymerase II from wheat germ. Th...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(86)80012-5
更新日期:1986-06-01 00:00:00
abstract::Selenium (Se) influences the levels of selenoprotein W (SelW) in mammals. However, little is known about the pattern of SelW expression in the pancreatic tissue of birds. To investigate the effects of dietary Se levels on the expression of SelW mRNA in the pancreatic tissue of birds, one-day-old chickens were randomly...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2011.05.022
更新日期:2011-09-01 00:00:00
abstract::Human metallothionein-3 (hMT3), also named as human neuronal growth inhibitory factor (hGIF), can inhibit the outgrowth of embryonic cortical neurons in the presence of brain extracts. In order to systematically study the structure-property-reactivity-function relationship of hGIF, our laboratory designed a series of ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章,评审
doi:10.1016/j.jinorgbio.2008.07.007
更新日期:2008-11-01 00:00:00
abstract::Imidazole glycerol phosphate dehydratase (IGPD) catalyses the dehydration of imidazole glycerol phosphate to imidazole acetol phosphate, an important late step in the biosynthesis of histidine. IGPD, isolated as a low molecular weight and inactive apo-form, assembles with specific divalent metal cations to form a cata...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章,评审
doi:10.1016/s0162-0134(00)00025-8
更新日期:2000-05-30 00:00:00
abstract::(Cu(CM)A)B(C6H5)4 and Cu(CM)A(OH) X H2O (CM = cimetidine and HA = L-alanine) were prepared and characterized by elemental analysis, TG-DTA, IR, and electronic spectral data and magnetic susceptibility measurements. The EPR spectrum of (Cu(CM)A)B(C6H5)4 shows a distorted octahedral environment for the Cu(II) ion. ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(87)80019-3
更新日期:1987-02-01 00:00:00
abstract::Manganese peroxidase (MnP) is an extracellular heme enzyme produced by the lignin-degrading white-rot fungus Phanerochaete chrysosporium. MnP catalyzes the peroxide-dependent oxidation of Mn(II) to Mn(III). The Mn(III) is released from the enzyme in complex with oxalate, enabling the oxalate-Mn(III) complex to serve a...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2010.02.011
更新日期:2010-06-01 00:00:00
abstract::The binding of Ru(phen)(2)dppz(2+) (dppz=dipyrido[3,2-a:2',3'-c]phenazine) to DNA was investigated at pH 7.0 and 25 degrees C using stopped-flow and spectrophotometric methods. Equilibrium measurements show that two modes of binding, whose characteristics depend on the polymer to dye ratio (C(P)/C(D)), are operative. ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2006.11.009
更新日期:2007-03-01 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::Recent findings on the photophysical investigations of several cofacial bisporphyrin dyads for through space singlet and triplet energy transfers raised several serious questions about the mechanism of the energy transfers and energy migration in the light harvesting devices, notably LH II, in the heavily studied purp...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2007.09.011
更新日期:2008-03-01 00:00:00
abstract::An overview is given of the results of metal ion-diclofenac interactions. Several complexes have been synthesized at the University of Ioannina. Binuclear complexes, [Cu(L)2(H2O)]2 x 2H2O and [CuL2(S)]2 where S is H2O, EtOH, DMSO, (CH3)2CO and DMF, and mononuclear complexes, [MnL2(H2O)], [FeL2(H2O)2], [CoL2(H2O)2] x 0...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(99)00175-0
更新日期:2000-04-01 00:00:00
abstract::Two DTPA derivatives, a mono-amide derivative containing an iodinated synthon, DTPA-IOPsp (L(1)) and the ligand DTPA(BOM)(3) (BOM=benzyloxymethyl) (L(2)), radiolabelled with (153)Sm(3+) and (111)In(3+), were studied as potential hepatospecific gamma scintigraphic agents. In vivo studies with Wistar rats show that the ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(02)00417-8
更新日期:2002-07-25 00:00:00
abstract::Lactoferrin (Lf) is a mammalian iron binding protein present in external secretions and in polymorphonuclear leukocytes. Its role in host defense mechanisms related to the non-immune defense system has been definitively established. Lf has two identical iron-binding sites, far from each other (44.3 A) and magnetically...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2004.05.003
更新日期:2004-08-01 00:00:00
abstract::The antineoplastic potential of a new stable mixed phosphine gold(I) complex containing tris(tert-butyl)phosphine (tBu3P) and bis(diphenylphosphino)ethene (dppet), namely [Au(tBu3P)(dppet)Cl], has been investigated in the human colon cancer HCT-116 cell line. The (31)P NMR solution study, confirms the structural featu...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2013.03.014
更新日期:2013-07-01 00:00:00
abstract::Twenty ferritin samples were prepared at pH 6.5 with average loadings of 0-89 Fe atoms per molecule. Nuclear magnetic relaxation times T1 and T2 were measured at 3 degrees C, 23 degrees C, and at 37 degrees C and at field strength from 0.025 to 1.5 T. The field dependence, temperature dependence, and approximate equal...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(98)10047-8
更新日期:1998-09-01 00:00:00
abstract::Copper(II) complexes supported by N3-tridentate ligands, consisting of a rigid cyclic diamine (8-membered cyclic-diamine; L8 or 7-membered cyclic-diamine; L7) and a 2-(2-pyridyl)ethyl (-CH2CH2Py) group, were synthesized and structurally characterized. Reaction of the copper(II) complexes and cumene hydroperoxide (CmOO...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2017.08.016
更新日期:2017-12-01 00:00:00
abstract::Recent studies of the reaction mechanism of the molybdenum-containing enzyme xanthine oxidase are presented. The pH-dependence of both the steady-state and rapid reaction kinetics of the enzyme exhibits is bell-shaped, with pK(a)s for the acid and alkaline limbs of 6.6 and 7.4, respectively. These are assigned to ioni...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2003.11.010
更新日期:2004-05-01 00:00:00
abstract::Incubation of cytochrome c oxidase (CcO) in its resting state in saturated ammonium sulfate, at room temperature overnight, gave EPR signals characteristic of a single Cu(II) center. From the g// and A// values it is concluded that this is a square-planar type 2 copper center, and superhyperfine splitting shows the pr...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(00)00189-6
更新日期:2001-01-15 00:00:00