scholarly journals An Optimised Di-Boronate-ChemMatrix Affinity Chromatography to Trap Deoxyfructosylated Peptides as Biomarkers of Glycation

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 755 ◽  
Author(s):  
Monika Kijewska ◽  
Francesca Nuti ◽  
Magdalena Wierzbicka ◽  
Mateusz Waliczek ◽  
Patrycja Ledwoń ◽  
...  
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Diabetes Complications ◽  
Ad Hoc ◽  
Complex Mixtures ◽  
The Novel ◽  
Peptide Mixtures ◽  
Lysine Residues ◽  
Modified Peptides

We report herein a novel ChemMatrix® Rink resin functionalised with two phenylboronate (PhB) moieties linked on the N-α and N-ε amino functions of a lysine residue to specifically capture deoxyfructosylated peptides, compared to differently glycosylated peptides in complex mixtures. The new PhB-Lys(PhB)-ChemMatrix® Rink resin allows for exploitation of the previously demonstrated ability of cis diols to form phenylboronic esters. The optimised capturing and cleavage procedure from the novel functionalised resin showed that only the peptides containing deoxyfructosyl-lysine moieties can be efficiently and specifically detected by HR-MS and MS/MS experiments. We also investigated the high-selective affinity to deoxyfructosylated peptides in an ad hoc mixture containing unique synthetic non-modified peptides and in the hydrolysates of human and bovine serum albumin as complex peptide mixtures. We demonstrated that the deoxyfructopyranosyl moiety on lysine residues is crucial in the capturing reaction. Therefore, the novel specifically-designed PhB-Lys(PhB)-ChemMatrix® Rink resin, which has the highest affinity to deoxyfructosylated peptides, is a candidate to quantitatively separate early glycation peptides from complex mixtures to investigate their role in diabetes complications in the clinics.

scholarly journals Interaction of dinitrophenyl groups bound to bovine serum albumin with univalent fragments of anti-dinitrophenyl antibody

1979 ◽  
Vol 177 (1) ◽  
pp. 225-236 ◽  
Author(s):  
C. Graham Knight ◽  
N. Michael Green
Keyword(s):  
Bovine Serum Albumin ◽  
Fluorescence Quenching ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Deae Cellulose ◽  
Serum Albumins ◽  
Single Polypeptide Chain ◽  
Quenching Efficiency ◽  
Lysine Residues ◽  
Single Polypeptide

Two lysine residues of bovine serum albumin reacted with 1-fluoro-2,4-dinitrobenzene with apparent second-order rate constants approx. 500-times greater than those observed in similar reactions with low-molecular-weight lysine derivatives. A series of dinitrophenyl (Dnp)-bovine serum albumins were prepared and their ability to bind univalent fragments of anti-Dnp antibody was measured by fluorescence-quenching titrations. Compared with the Dnp group of the free hapten, 6-N-Dnp-aminohexanoate, the majority of the protein-bound Dnp groups were unavailable to the antibody at pH8.0. When the same Dnp-albumins were titrated at pH3.0 the availability of the Dnp groups increased approx. 3-fold. Dnp-albumins were treated with pepsin at pH3.0 and Dnp-containing fragments isolated by chromatography on DE-52 DEAE-cellulose. Fluorescence-quenching titrations showed that the Dnp groups on the fragments behaved like the free hapten with respect to quenching efficiency, although with an increased dissociation constant. The association between the Dnp-albumins and the antibody was measured also by difference-spectral titrations at high protein concentrations. Antibody binding was increased under these conditions, but the Dnp group of mono-Dnp-albumin remained unavailable to antibody. We propose that the reactive lysine residues are located in clefts between the globular sub-domains of the single polypeptide chain. Dnp groups attached to these lysine residues are fully exposed to the solvent, but binding of the macromolecular probe, anti-Dnp antibody, is sterically hindered by the adjacent surface of the albumin molecule.

scholarly journals The novel behaviour of interactions between Ni2+ ion and human or bovine serum albumin

1994 ◽  
Vol 304 (1) ◽  
pp. 23-26 ◽  
Author(s):  
Y Zhou ◽  
X Hu ◽  
D Ouyang ◽  
J Huang ◽  
Y Wang
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Conformational Transition ◽  
Electric Dipole Transition ◽  
Molar Ratio ◽  
The Novel ◽  
Dipole Interactions ◽  
Hysteretic Effect ◽  
Hypochromic Effect

We discovered a series of novel behaviours of interactions between Ni2+ ion and human or bovine serum albumin. Our results indicated that there exist two closely neighbouring identical prior binding sites in the binding of human or bovine serum albumin with Ni2+ ions, not only one. It is very likely that, after the binding of the first Ni2+ ion, an induced slow conformational transition happens, which leads to the binding of the second Ni2+ ion and shows itself as a hysteretic effect for a process of non-enzymic protein binding with metal ions. As the concentrations of the 1:1 (molar ratio of Ni2+ ion to protein) system increase, an increasing hypochromic effect is observed. Such a hypochromic effect has not been reported previously; however, it is in accord with the mechanism of dipole-dipole interactions between the electric dipole transition moments of chromophores.

Improvement of an artificial test substrate technique for evaluation of em immunocytochemical labeling

1987 ◽  
Vol 45 ◽  
pp. 762-763
Author(s):  
G. D. Gagne ◽  
M. F. Miller
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Artificial Substrate ◽  
Chemical Fixation ◽  
As If

We recently described an artificial substrate system which could be used to optimize labeling parameters in EM immunocytochemistry (ICC). The system utilizes blocks of glutaraldehyde polymerized bovine serum albumin (BSA) into which an antigen is incorporated by a soaking procedure. The resulting antigen impregnated blocks can then be fixed and embedded as if they are pieces of tissue and the effects of fixation, embedding and other parameters on the ability of incorporated antigen to be immunocyto-chemically labeled can then be assessed. In developing this system further, we discovered that the BSA substrate can also be dried and then sectioned for immunolabeling with or without prior chemical fixation and without exposing the antigen to embedding reagents. The effects of fixation and embedding protocols can thus be evaluated separately.

Stability of Prostacyclin in Human Plasma and Whole Blood: Studies on the Protective Effect of Albumin

1981 ◽  
Vol 46 (03) ◽  
pp. 645-647 ◽  
Author(s):  
M A Orchard ◽  
C Robinson
Keyword(s):  
Platelet Aggregation ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Protective Effect ◽  
Whole Blood ◽  
Bovine Serum ◽  
Fatty Acid Content ◽  
Krebs Solution ◽  
Antiaggregatory Activity ◽  
Free Plasma

SummaryThe biological half-life of prostacyclin in Krebs solution, human cell-free plasma or whole blood was measured by bracket assay on ADP-induced platelet aggregation. At 37°C, pH 7.4, plasma and blood reduced the rate of loss of antiaggregatory activity compared with Krebs solution. The protective effect of plasma was greater than that of whole blood. This effect could be partially mimicked by the addition of human or bovine serum albumin to the Krebs solution. The stabilisation afforded by human serum albumin was dependent on the fatty acid content of the albumin, although this was less important for bovine serum albumin.

RADIOIMMUNOASSAY OF OESTRONE AND OESTRADIOL IN THE PERIPHERAL PLASMA OF THE DOMESTIC FOWL IN VARIOUS PHYSIOLOGICAL STATES AND OF HYPOPHYSECTOMIZED AND OVARIECTOMIZED FOWLS

1974 ◽  
Vol 75 (1) ◽  
pp. 133-140 ◽  
Author(s):  
B. E. Senior
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Diethyl Ether ◽  
Bovine Serum ◽  
Domestic Fowl ◽  
Laying Hens ◽  
Peripheral Plasma ◽  
The Mean ◽  
Precision And Accuracy ◽  
Chicken Ovary

ABSTRACT A radioimmunoassay was developed to measure the levels of oestrone and oestradiol in 0.5–1.0 ml of domestic fowl peripheral plasma. The oestrogens were extracted with diethyl ether, chromatographed on columns of Sephadex LH-20 and assayed with an antiserum prepared against oestradiol-17β-succinyl-bovine serum albumin using a 17 h incubation at 4°C. The specificity, sensitivity, precision and accuracy of the assays were satisfactory. Oestrogen concentrations were determined in the plasma of birds in various reproductive states. In laying hens the ranges of oestrone and oestradiol were 12–190 pg/ml and 29–327 pg/ml respectively. Levels in immature birds, in adult cockerels and in an ovariectomized hen were barely detectable. The mean concentrations of oestrone and oestradiol in the plasma of four non-laying hens (55 pg/ml and 72 pg/ml respectively) and one partially ovariectomized hen (71 pg/ml and 134 pg/ml respectively) were well within the range for laying hens. It is evident that the large, yolk-filled follicles are not the only source of oestrogens in the chicken ovary.

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