Abstract:
:Neuronal nitric oxide synthase (nNOS) generates superoxide, particularly at sub-optimal l-arginine (l-Arg) substrate concentrations. Heat shock protein 90 (Hsp90) was reported to inhibit superoxide generation from nNOS protein. However, commercially available Hsp90 product from bovine brain tissues with unspecified Hsp90α and Hsp90β contents and an undefined Hsp90 protein oligomeric state was utilized. These two Hsp90s can have opposite effect on superoxide production by NOS. Importantly, emerging evidence indicates that nNOS splice variants are involved in different biological functions by functioning distinctly in redox signaling. In the present work, purified recombinant human Hsp90α, in its native dimeric state, was used in electron paramagnetic resonance (EPR) spin trapping experiments to study the effects of Hsp90α on superoxide generation from nNOS splice variants nNOSμ and nNOSα. Human Hsp90α was found to significantly increase superoxide generation from nNOSμ and nNOSα proteins under l-Arg-depleted conditions and Hsp90α influenced superoxide production by nNOSμ and nNOSα at varying degrees. Imidazole suppressed the spin adduct signal, indicating that superoxide was produced at the heme site of nNOS in the presence of Hsp90α, whereas l-Arg repletion diminished superoxide production by the nNOS-Hsp90α. Moreover, NADPH consumption rate values exhibited a similar trend/difference as a function of Hsp90α and l-Arg. Together, these EPR spin trapping and NADPH oxidation kinetics results demonstrated noticeable Hsp90α-induced increases in superoxide production by nNOS and a distinguishable effect of Hsp90α on nNOSμ and nNOSα proteins.
journal_name
J Inorg Biochemjournal_title
Journal of inorganic biochemistryauthors
Zheng H,Weaver JM,Feng Cdoi
10.1016/j.jinorgbio.2020.111298subject
Has Abstractpub_date
2021-01-01 00:00:00pages
111298eissn
0162-0134issn
1873-3344pii
S0162-0134(20)30326-3journal_volume
214pub_type
杂志文章abstract::We have analyzed the early stages of unfolding of cytochromes c-b562 (PDB ID: 2BC5) and Rd apo b562 (PDB ID: 1YYJ). Our geometrical approach proceeds from an analysis of the crystal structure reported for each protein. We quantify, residue-by-residue and region-by-region, the spatial and angular changes in the structu...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2020.111209
更新日期:2020-10-01 00:00:00
abstract::It was previously shown that complexation of 67Cu with His facilitates 67Cu uptake by hypothalamic slices and that His, in a concentration that is 1000-fold greater than Cu(His)2, inhibits 67Cu uptake (D. E. Hartter and A. Barnea, J. Biol. Chem. 263, 799-805 (1988)). We addressed the question: Does dissociation of the...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(90)80041-u
更新日期:1990-09-01 00:00:00
abstract::The results of 1H spin-echo Fourier transform (SEFT) nuclear magnetic resonance (nmr) experiments suggest that some aurothiomalate binds intracellular glutathione (GSH) when added to suspensions of red cells in vitro. When added to red cell lysates, a specific binding of gold to cysteine of GSH is observed together wi...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(83)85027-2
更新日期:1983-11-01 00:00:00
abstract::The active site of [NiFe] hydrogenase is a binuclear metal complex composed of Fe and Ni atoms and is called the Ni-Fe site, where the Fe atom is known to be coordinated to three diatomic ligands. Two mass spectrometric techniques, pyrolysis-MS (pyrolysis-mass spectrometry) and TOF-SIMS (time-of-flight secondary ion m...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(00)00081-7
更新日期:2000-07-01 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::Reactions of bacterial Fe(III) cyt b562, HbO2, met Hb and met Mb with Et3PAuCl and Et3PAuNO3 (and some related complexes) have been investigated by electronic absorption and EPR and NMR spectroscopy. Except for met Hb, which denatured, the products were novel high-spin Fe(III) heme proteins. The reactions of cyt b562 ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(86)80104-0
更新日期:1986-05-01 00:00:00
abstract::Anhydrotetracycline (AHTC) is the major toxic decomposition product of the antibiotic tetracycline. The complexation of AHTC to Mg(II), Al(III), and Fe(III) was studied in aqueous medium using absorption and circular dichroism measurements. The study of the Mg(II)-AHTC interactions at pH 7 indicated the formation of t...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(95)00017-i
更新日期:1995-11-15 00:00:00
abstract::Triapine, the most prominent anticancer drug candidate from the substance class of thiosemicarbazones, was investigated in >30 clinical phase I and II studies. However, the results were rather disappointing against solid tumors, which can be explained (at least partially) due to inefficient delivery to the tumor site....
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pub_type: 杂志文章
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更新日期:2019-01-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章,评审
doi:10.1016/0162-0134(92)84064-t
更新日期:1992-08-15 00:00:00
abstract::An array of poly- and mononuclear complexes of Pt(II) with polypyridyl ligands is reported. The framework complexes [(PtCl(2))(2)(bpp)(2)(micro-PtCl(2))](H(2)O)(2) [bpp=2,3-bis(2-pyridyl)pyrazine], [PtCl(2)(micro-tptz)PtClNCPh]Cl [tptz=2,4,6-tris(2-pyridyl)-1,3,5-triazine], and mononuclear PtCl(2)(NH(2)dpt) [NH(2)dpt=...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2007.06.024
更新日期:2007-10-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2013.10.023
更新日期:2014-02-01 00:00:00
abstract::L-Cysteinatogold(I) was prepared by the reaction of L-cysteine with KAuBr4 in acidic media and its solubility determined from pH 4 to 10. The solubility at pH 7.4 and 37 degrees C is 1 microM. In the presence of excess cysteine, the solubility increases because of formation of bis(L-cysteinato)gold(I). The equilibrium...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(00)80198-1
更新日期:1979-07-01 00:00:00
abstract::Platinum complexes PtII(DAPO)X2 with diaminonitroxyl radical-trans-3,4-diamino-2,2,6,6-tetramethylpiperidine-1-oxyl (DAPO)-were synthesized by the direct reaction of DAPO with K2PtX4 (X = Cl, I) or by the replacement of chloro ligands in PtII(DAPO)Cl2 by bromo, nitrato, oxalato, malonato, and 1,1-cyclobutanedicarboxyl...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(96)00029-3
更新日期:1996-10-01 00:00:00
abstract::The effect of AlCl(3) on the (Na(+)/K(+))ATPase activity of freeze-thawed synaptosomes, isolated from rat brain cortex, has been studied. The AlCl(3) action on the enzyme hydrolytic activity was examined using in vitro and in vivo approaches. Following exposure to AlCl(3) using both in vitro (synaptosomes incubated in...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(03)00257-5
更新日期:2003-09-15 00:00:00
abstract::The [Cu(sulfathiazolato)(2)(benzimidazole)(2)]2MeOH complex has been synthesised and characterised. It crystallises in the monoclinic system, space group C1c1, with unit cell dimensions a=18.829(7) A, b=12.206(3) A, c=17.233(5) A, alpha=90.06(2) degrees, beta=97.28(3) degrees, gamma=90.21(3) degrees and Z=4. The geome...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(01)00369-5
更新日期:2002-04-10 00:00:00
abstract::A catalytic chlorination of ketones was performed by using a vanadium catalyst in the presence of Bu4NI and AlCl3 under atmospheric molecular oxygen. This catalytic chlorination could be applied to the chlorination of alkenes to give the corresponding vic-dichlorides. AlCl3 was found to serve as both a Lewis acid and ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2015.01.015
更新日期:2015-06-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
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abstract::The 1,7-diacetate-4,10-diacetamide substituted 1,4,7,10-tetraazacyclododecane structural unit is common to several responsive Magnetic Resonance Imaging (MRI) contrast agents (CAs). While some of these complexes (agents capable of sensing fluctuations in Zn2+, Ca2+ etc. ions) have already been tested in vivo, the deta...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
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abstract::Four imidazolate-bridged binuclear copper(II)-copper(II) and copper(II)-zinc(II) complexes viz., [(Bipy)(2)Cu-Im-Cu(Bipy)(2)](ClO(4))(3).CH(3)OH, [(Phen)(2)Cu-Im-Cu(Phen)(2)](BF(4))(3).2CH(3)OH, [(Bipy)(2)Cu-Im-Zn(Bipy)(2)](BF(4))(3), and [(Phen)(2)Cu-Im-Zn(Phen)(2)](BF(4))(3), (Bipy=2,2'-Bipyridyl, Phen=1-10-Phenanth...
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/s0162-0134(02)00369-0
更新日期:2002-07-25 00:00:00
abstract::The novel steroidal carrier ligand 17-α-[4'-ethynyl-dimethylbenzylamine]-17-β-testosterone (ET-dmba 1) and the steroid--C,N-chelate platinum(II) derivatives [Pt(ET-dmba)Cl(L)] (L = DMSO (2) and PTA (3; PTA =1,3,5-triaza-7-phosphaadamantane)) have been prepared. Values of IC(50) were calculated for the new platinum com...
journal_title:Journal of inorganic biochemistry
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更新日期:2011-04-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
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更新日期:2012-12-01 00:00:00
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journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2011.11.014
更新日期:2012-02-01 00:00:00
abstract::The effect of inositol hexakisphosphate, 2,3-diphosphoglycerate, dextran sulphate, and heparin on the spectroscopic (absorbance, circular dichroism, EPR) properties of the nitric oxide derivative of ferrous dromedary (Camelus dromedarius) hemoglobin was investigated. The results obtained show that: (i) all polyanions ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(88)85001-3
更新日期:1988-04-01 00:00:00
abstract::Measurement and interpretation of the EXAFS associated with the K-absorption edge of zinc atoms in sheep liver metallothionein indicate that the primary coordination shell of each of these metal atoms comprises four sulphur atoms, with the Zn-S distance being 2.29 +/- 0.02 A. ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/s0162-0134(00)80112-9
更新日期:1982-06-01 00:00:00
abstract::Fe(III)-salen (N,N-bis(salicylidene)-ethane-1,2-diimine) complexes of simple hydroxamic acids and the MMP (matrix metalloproteinase) inhibitor marimastat have been evaluated as hypoxia activated drug carriers. The aceto- (aha), propion- (pha), benzohydroxamato (bha), and marimastat complexes were prepared and characte...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2006.11.003
更新日期:2007-03-01 00:00:00
abstract::A previous evaluation of the insulin-like activity of three 3-hydroxy-4-pyridinonato oxidovanadium(IV) complexes raised questions about structure/activity relationships, namely the influence of the hydrophilic/lipophilic balance of the complex and the capacity of the ligand to stabilize the +4 oxidation state of vanad...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2008.12.019
更新日期:2009-04-01 00:00:00
abstract::Inhibition of hemin-mediated O2 activation by bovine superoxide dismutase and the copper tetrammine complex has been examined. It is shown that the inhibitory effect of these species is not due to metabolism of O2-., but to a nonspecific inhibition of the process by the Cu2+ ion. We propose that the inhibition occurs ...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/0162-0134(89)80026-1
更新日期:1989-09-01 00:00:00
abstract::A series of platinum(II) complexes with 2,9-disubstituted-6-benzylaminopurines has been prepared. The complexes have the following composition: cis-[Pt(Boh)(2)Cl(2)] (1), cis-[Pt(Oc)(2)Cl(2)] (2), cis-[Pt(Ros)(2)Cl(2)] (3), cis-[Pt(i-PrOc)(2)Cl(2)] (4), cis-[Pt(BohH(+))(2)Cl(2)]Cl(2) (5), cis-[Pt(OcH(+))(2)Cl(2)]Cl(2)...
journal_title:Journal of inorganic biochemistry
pub_type: 杂志文章
doi:10.1016/j.jinorgbio.2005.07.009
更新日期:2005-11-01 00:00:00