Abstract:
:The stability of the Glossoscolex paulistus hemoglobin (HbGp), in two iron oxidation states (and three forms), as monitored by optical absorption, fluorescence emission and circular dichroism (CD) spectroscopies, in the presence of the chaotropic agent urea, is studied. HbGp oligomeric dissociation, denaturation and iron oxidation are observed. CD data show that the cyanomet-HbGp is more stable than the oxy-form. Oxy- and cyanomet-HbGp show good fits on the basis of a two state model with critical urea concentrations at 220-222 nm of 5.1±0.2 and 6.1±0.1 mol/L, respectively. The three-state model was able to reveal a subtle second transition at lower urea concentration (1.0-2.0 mol/L) associated to partial oligomeric dissociation. The intermediate state for oxy- and cyanomet-HbGp is very similar to the native state. For met-HbGp, a different equilibrium, in the presence of urea, is observed. A sharp transition at 1.95±0.05 mol/L of denaturant is observed, associated to oligomeric dissociation and hemichrome formation. In this case, analysis by a three-state model reveals the great similarity between the intermediate and the unfolded states. Analysis of spectroscopic data, by two-state and three-state models, reveals consistency of obtained thermodynamic parameters for HbGp urea denaturation.
journal_name
Arch Biochem Biophysjournal_title
Archives of biochemistry and biophysicsauthors
Carvalho FA,Santiago PS,Tabak Mdoi
10.1016/j.abb.2012.01.007subject
Has Abstractpub_date
2012-03-01 00:00:00pages
46-58issue
1eissn
0003-9861issn
1096-0384pii
S0003-9861(12)00009-4journal_volume
519pub_type
杂志文章abstract::Transforming growth factor-β (TGF-β) is pivotal in the pathogenesis of diabetic nephropathy. Type 1 TGF-β receptor (TGF-βR1) is degraded by Smad7-dependent ubiquitination-proteasomal pathway, which is deubiquitinated by ubiquitin C-terminal hydrolase-L5 (UCHL5). Therefore, we studied the role of UCHL5 in high glucose ...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/j.abb.2013.03.003
更新日期:2013-07-15 00:00:00
abstract::Sarcolemmal vesicles of white and red skeletal muscles of the rabbit were prepared by consecutive density gradient centrifugations in sucrose and dextran according to Seiler and Fleischer (1982, J. Biol. Chem. 257, 13,862-13,871). White and red muscle membrane fractions enriched in sarcolemma were characterized by hig...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(90)90501-o
更新日期:1990-06-01 00:00:00
abstract::The reactivities of the sulfhydryl groups of rat, turkey, human, and calf hemoglobin were studied together with the enzyme activities of glutathione peroxidase, glutathione reductase, glucose-6-phosphate dehydrogenase, and glutaredoxin in lysed erythrocytes to evaluate their roles in regulating redox homeostasis. The ...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1006/abbi.1998.0694
更新日期:1998-07-15 00:00:00
abstract::The role of the conserved sequence motif 301DDLTDP306 in the F0F1 ATP synthase beta subunit was assessed by mutagenic analysis in the Escherichia coli enzyme. Mutations gave variable effects on F1 sector activity, stability, and membrane binding to the F0 sector. Upon solubilization, F1 sectors of the betaD302E and be...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1006/abbi.1998.0856
更新日期:1998-10-15 00:00:00
abstract::Staphylococcus aureus is associated with several clinically significant infections among humans and infections associated with antibiotic-resistant strains are growing in frequency. Antivirulence strategies shift the target of drugs from bacterial growth to the infection process resulting to milder evolutionary pressu...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/j.abb.2018.03.010
更新日期:2018-05-01 00:00:00
abstract::Protoporphyrinogen oxidase (EC 1.3.3.4) is the penultimate enzyme in the heme biosynthetic pathway, catalyzing the six-electron oxidation of protoporphyrinogen to protoporphyrin. A dominantly inherited genetic deficiency in this enzyme results in the disease variegate porphyria. We now report the cloning, sequence, an...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1006/abbi.1995.0051
更新日期:1995-12-20 00:00:00
abstract::A radioimmunoassay was developed to assess the response of testicular HO-1 to agents known to increase the microsomal heme oxygenase activity. Treatment of rats with human chorionic gonadotropin (hCG) increased the microsomal heme oxygenase activity in rat testis. The following data suggest that the increase was speci...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(89)90569-9
更新日期:1989-01-01 00:00:00
abstract::The effect of phenothiazines (trifluoperazine, chlorpromazine, methochlorpromazine, and imipramine) on Ca2+ fluxes in light and heavy sarcoplasmic reticulum (SR) isolated from rabbit fast-twitch skeletal muscle was investigated. These drugs inhibited Ca2+ loading and (Ca2+,Mg2+)-ATPase activity, but had no effect on u...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(84)90614-3
更新日期:1984-08-15 00:00:00
abstract::CYP2D15 is the canine ortholog of human CYP2D6, the human CYP2D isoform involved in the metabolism of drugs such as antiarhythmics, adrenoceptor antagonists, and tricyclic antidepressants. Similar to human, canine CYP2D15 is expressed in the liver, with detectable levels in several other tissues. Three different CYP2D...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1006/abbi.1998.0801
更新日期:1998-09-01 00:00:00
abstract::Nasal cartilage is widely used in reconstructive surgery for the replacement of soft tissue defects and nasal reconstruction procedures. The ability to shape harvested tissue and the performance in the transplant site are related to the mechanical properties of nasal cartilage. Several studies have documented changes ...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/S0003-9861(02)00263-1
更新日期:2002-07-01 00:00:00
abstract::Current issues in research on health effects by polyphenols are addressed. As to the cardiovascular system, flow-mediated dilation (FMD), a functional biomarker, can be used as surrogate marker for cardiovascular risk. Acute short-term effects peaking at 2h after ingestion of polyphenol-rich food items are distinguish...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章,评审
doi:10.1016/j.abb.2010.04.006
更新日期:2010-09-01 00:00:00
abstract::Heme and iron are essential to almost all forms of life. The strict maintenance of heme and iron homeostasis is essential to prevent cellular toxicity and the existence of systemic and intracellular regulation is fundamental. Cytosolic heme can be catabolized and detoxified by heme oxygenases (HOs). Interestingly, fre...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章,评审
doi:10.1016/j.abb.2019.108071
更新日期:2019-09-15 00:00:00
abstract::The antioxidant, butylated hydroxytoluene (BHT), causes lung toxicity in mice followed by regenerative repair, and can also modulate the development of carcinogen-induced lung adenomas. We are investigating changes in pulmonary biochemistry following BHT treatment in order to understand the mechanisms of BHT-induced p...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(87)90421-8
更新日期:1987-07-01 00:00:00
abstract::Hyperammonemia is a major pathophysiological factor in encephalopathies associated with acute and chronic liver failure. On mouse brain slice preparations we analyzed the effects of ammonium on the characteristics of corticostriatal long-term potentiation (LTP) induced by high-frequency electrical stimulation (HFS) of...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/j.abb.2013.02.002
更新日期:2013-08-15 00:00:00
abstract::The interaction of sarcoplasmic reticulum Ca(2+)-ATPase with the Mg.ATP analogues Rh(H2O)4ATP and Co(NH3)4ATP have been examined. Co(NH3)4ATP slowly inactivates Ca(2+)-ATPase in a first order process, with a rate constant of 1.13 x 10(-3) s-1 and an apparent inactivation constant, KI, of 32 mM. Rh(H2O)4ATP likewise in...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(92)90505-q
更新日期:1992-05-15 00:00:00
abstract::Effects of free fatty acids on parameters of (Na+,K+)-ATPase regulation related to enzyme conformation were examined. Sensitivity to inhibition by free fatty acid increased as the number of double bonds increased. Free fatty acids reduced affinity for K+ or Na+ at their regulatory sites without altering apparent K+ af...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(84)90456-9
更新日期:1984-09-01 00:00:00
abstract::Multidrug resistance (MDR) caused by overexpressed permeability-glycoprotein (P-gp) in cancer cells is the main barrier for the cure of cancers. P-gp can pump many chemotherapeutic drugs, which is a viable target to overcome P-gp-mediated MDR by efficient inhibitors of P-gp. However, limited understanding of the efflu...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/j.abb.2020.108675
更新日期:2020-12-15 00:00:00
abstract::The absorption spectra of Ni(II) bound to the core histone tetramer, (H3-H4)2, of chicken erythrocytes in 500 mM NaCl + 100 mM phosphate (pH 7.4) were recorded. A charge transfer band was seen at 317 nm, characteristic of a bond between Ni(II) and the sulfur atom of Cys-110 of histone H3. The conditional affinity cons...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1006/abbi.1999.1137
更新日期:1999-04-15 00:00:00
abstract::It was found that the rate of polymerization of G-actin increased with the decrease of ATP concentration. When excess ATP was replaced by chloride through anion-exchange treatment, the extent of actin polymerization did not change provided that the ionic strength was raised immediately after the treatment. In the mean...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(83)90426-5
更新日期:1983-02-01 00:00:00
abstract::Cortactin is an F-actin binding protein that contributes to cytoskeleton remodelling. We identified five isoforms of mouse cortactin that differ in the number of tandem 37-amino acid repeats, named cortactin repeats. The transcription of minor isoforms with 4.5, 3.5 or 2.5 cortactin repeats was low in most adult tissu...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/j.abb.2004.04.015
更新日期:2004-07-01 00:00:00
abstract::Three forms of 20-kDa myosin light chain (MLC), unphosphorylated, monophosphorylated, and diphosphorylated MLC (designated 20K, 20K-P, and 20K-PP) were demonstrated in thrombin-stimulated human platelets by two different gel electrophoretic methods: in the presence of glycerol urea or in two dimensions (isoelectric an...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(88)90337-2
更新日期:1988-03-01 00:00:00
abstract::Tumor necrosis factor-alpha (TNF-alpha) binds to TNF-alpha receptors (TNFR) to produce a hexameric (TNF-alpha)(3)-(TNFR)(3) structure that stimulates apoptosis. We found by using ELISA that TNF-alpha binds to the glycosylphosphatidylinositol (GPI) anchor glycans of carcinoembryonic antigen, human placental alkaline ph...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/j.abb.2004.02.028
更新日期:2004-06-15 00:00:00
abstract::The nature and role of intermediates have been the subject of much heated debate in the field of protein folding. Historically, intermediates were viewed as essential stepping-stones that guide a protein through the folding process to the native state. However, with the experimental identification of numerous small pr...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章,评审
doi:10.1016/j.abb.2012.10.006
更新日期:2013-03-01 00:00:00
abstract::To investigate the effect of elevation of liver glycogen synthase (GYS2) activity on glucose and glycogen metabolism, we performed adenoviral overexpression of the mutant GYS2 with six serine-to-alanine substitutions in rat primary hepatocytes. Cell-free assays demonstrated that the serine-to-alanine substitutions cau...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/j.abb.2007.08.006
更新日期:2007-10-15 00:00:00
abstract::Glycerol is a dietary component which is metabolized primarily by the liver and kidney where it is used mainly for glucose synthesis. The metabolism of glycerol is very similar to that of dihydroxyacetone which can be considered its more oxidized counterpart. The effects of these substrates on hepatic lipogenesis and ...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(89)90263-4
更新日期:1989-05-15 00:00:00
abstract::Hemorrhagic toxin f (HT-f) was isolated from Crotalus atrox (Western Diamondback Rattlesnake) venom by a five-step purification procedure. Homogeneity was established by the formation of a single band in acrylamide gel electrophoresis, isoelectric focusing, and sodium dodecyl sulfate (SDS)-electrophoresis. HT-f has a ...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(84)90393-x
更新日期:1984-06-01 00:00:00
abstract::We have previously demonstrated that dietary fat, especially unsaturated fatty acids, induces cellular retinol-binding protein, type II (CRBPII) gene expression in rat jejunum. In the present study, we showed that feeding a high-fat diet caused parallel increases in jejunal CRBPII mRNA and CRBPII pre-mRNA levels. Nucl...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1006/abbi.1998.1018
更新日期:1999-02-01 00:00:00
abstract::The stoichiometry of complex formation between two lysosomal proteinases from rabbit liver, cathepsin M and fructose 1,6-bisphosphatase converting enzyme (CE), and their respective endogenous inhibitors was studied by the equilibrium gel penetration method. In each case the molecular weight of the complex was found to...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(84)90011-0
更新日期:1984-02-01 00:00:00
abstract::Glyoxalase I, a member of the metalloglutathione (GSH) transferase superfamily, plays a critical detoxification role in cells by catalyzing the conversion of cytotoxic methylglyoxal (as the diastereomeric GSH-thiohemiacetals) to S-D-lactoylglutathione via a 1,2-hydrogen transfer. The mechanism-of-action of this Zn2+-m...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章,评审
doi:10.1006/abbi.2000.2253
更新日期:2001-03-01 00:00:00
abstract::Thromboxane A2 (TXA) is a potent vasoconstrictor and mediator of platelet aggregation. Thromboxane synthase (TXAS), which catalyzes the biosynthesis of TXA, is a member of the cytochrome P450 superfamily. We report here the complete genomic structure of the human TXAS gene. The gene contains 13 exons and is 193 kb lon...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1006/abbi.1996.0464
更新日期:1996-10-15 00:00:00