Synthesis of hyperbranched glycodendrimers incorporating α-thiosialosides based on a gallic acid core

1997 ◽  
Vol 75 (11) ◽  
pp. 1472-1482 ◽  
Author(s):  
Serge J. Meunier ◽  
Quigquan Wu ◽  
Sho-Nong Wang ◽  
René Roy
Keyword(s):  
Sialic Acid ◽  
Gallic Acid ◽  
Protein Interactions ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Water Soluble ◽  
Cross Link ◽  
Binding Studies ◽  
Turbidimetric Analysis ◽  
Dendritic Precursors

Hyperbranched glycodendrimers containing sialic acid residues were synthesized in order to further understand the multivalency effect and its role in carbohydrate–protein interactions. Gallic acid 7 as trivalent core and oligoethylene glycol derivatives as hydrophilic spacers were used to scaffold the dendritic backbones. α-Thiosialoside 16 was conjugated onto N-chloroacetylated dendritic precursors 13,14, and 26 by nucleophilic substitution to afford trivalent 17,18, and nonavalent 27 sialodendrimers. Complete sugar deprotection furnished water-soluble α-thiosialodendrimers 21,22, and 29, which were used in protein-binding studies. Turbidimetric analysis confirmed the strong potential of sialodendrimers 29 having nine readily accessible sialic acid residues to bind, cross-link, and precipitate two different lectins. Preliminary results indicated that nonavalent α-sialodendrimer 29 had a greater affinity towards dimeric wheat germ agglutinin (WGA) and the lectin from the slug Limaxflavus (LFA) than the corresponding trivalent glycodendrimers 21 and 22. Keywords: carbohydrate, dendrimer, sialic acid, gallic acid, lectin, wheat germ agglutinin, Limaxflavus.

scholarly journals The investigation of the changes in the surface glycoconjugates using two different spheroid models of breast cancer cells and availability assessment of these spheroid models for rapid diagnosis

2021 ◽  
Vol 38 (3) ◽  
pp. 266-271
Author(s):  
Yosun MATER ◽  
Günnur DEMİRCAN
Keyword(s):  
Breast Cancer ◽  
Cell Culture ◽  
Sialic Acid ◽  
Cancer Cell ◽  
Breast Cancer Cell ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Sialic Acids ◽  
Maackia Amurensis ◽  
Maackia Amurensis Lectin

The importance of early cancer diagnosis has led to development of many different diagnostic methods. In this context, the studies investigating the presence and amount of sugar residues to use as indicators in the identification of cancer cell type have become prominent. In the present study, sialic acids found on the membrane surfaces of ER (+) MCF-7 and ER (-) MDA-MB-231 breast cancer cell lines were labeled using three-dimensional (3D) cell culture (Spheroid) model as the closest method to the patient sample, thus its natural environment, among the cell culture methods. These sugar units that play a role in regulation of important immune characteristics such as recognition, binding and metastasis were made visualizable by applying fluorescent-labeled lectins such as FITC-(Wheat Germ Agglutinin) specifically binding to sialic acid units (GlcNAc, Neu5Ac) including particularly ß-GlcNAc and FITC-(Maackia Amurensis-Lectin-1) specifically binding to Galß4GlcNAc type sialic acids. These glycan units were specifically labeled with FITC-(Maackia Amurensis-Lectin-1) and FITC- (Wheat Germ Agglutinin) and radiation intensities were analyzed relatively. The two different breast cancer cell cultures were compared with respect to change in the amounts of sialic acid residues containing α-2,3- and α-2,6 bonds using fluorescent-labeled lectins. In the present study, we have performed a precise, accurate and rapid determination of the sugar content in the different breast cancer cell surface lines by means of fluorescent-labeled lectins and carried out a relative comparison between the micrographs.

Interaction of wheat germ agglutinin with sialic acid

Biochemistry ◽  
1979 ◽  
Vol 18 (24) ◽  
pp. 5505-5511 ◽  
Author(s):  
Barry P. Peters ◽  
Shigeyuki Ebisu ◽  
Irwin J. Goldstein ◽  
Michael Flashner
Keyword(s):  
Sialic Acid ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ

Isoelectric forms of clusterin isolated from ram rete testis fluid and from secretions of primary cultures of ram and rat Sertoli-cell-enriched preparations

1984 ◽  
Vol 62 (6) ◽  
pp. 456-461 ◽  
Author(s):  
O. W. Blaschuk ◽  
I. B. Fritz
Keyword(s):  
Sialic Acid ◽  
Granulosa Cell ◽  
Sertoli Cell ◽  
Isoelectric Point ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Primary Cultures ◽  
Rete Testis ◽  
Ph Values ◽  
A Cell

Clusterin, a cell aggregating factor isolated from ram rete testis fluid (RTF), is shown to contain 14.7% hexoses, 13.6% glucosamine, and 7.9% sialic acid. The isoelectric point (pI) of the predominant electrophoretic form of clusterin from ram RTF is 3.7. After treatment with neuraminidase, the pI values become more basic, with the majority of the material being eluted from a chromatofocusing column at pH values between 4.9 and 5.1. Intact clusterin binds quantitatively to wheat germ agglutinin – Sepharose 6 MB, but after treatment with neuraminidase only 49% specifically binds. Clusterin isolated from proteins secreted by primary cultures of ram Sertoli-cell-enriched preparations was shown to have properties similar to those of intact clusterin isolated from ram RTF. In contrast, clusterin isolated from proteins secreted by primary cultures of rat Sertoli- or granulosa-cell-enriched preparations has isoelectric forms which more closely resemble those of neuraminidase-treated ram clusterin.

scholarly journals Differential involvement of cell surface sialic acid residues in wheat germ agglutinin binding to parental and wheat germ agglutinin-resistant Chinese hamster ovary cells.

1980 ◽  
Vol 85 (1) ◽  
pp. 60-69 ◽  
Author(s):  
P Stanley ◽  
T Sudo ◽  
J P Carver
Keyword(s):  
Sialic Acid ◽  
Cell Surface ◽  
Chinese Hamster Ovary ◽  
Cho Cells ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Chinese Hamster Ovary Cells ◽  
Chinese Hamster ◽  
Cho Cell ◽  
Differential Involvement

Two Chinese hamster ovary (CHO) cell mutants selected for resistance to wheat germ agglutinin (WGA) have been shown to exhibit defective sialylation of membrane glycoproteins and a membrane glycolipid, GM3. The mutants (termed WgaRII and WgaRIII) have been previously shown to belong to different genetic complementation groups and to exhibit different WGA-binding abilities. These mutants and a WGA-resistant CHO cell mutant termed WgaRI (which also possesses a surface sialylation defect arising from a deficient N-acetylglucosaminyltransferase activity), have enabled us to investigate the role of sialic acid in WGA binding at the cell surface. Scatchard plots of the binding of 125I-WGA (1 ng/ml to 1 mg/ml) to parental and WgaR CHO cells before and after a brief treatment with neuraminidase provide evidence for several different groups of sialic acid residues at the CHO cell surface which may be distinquished by their differential involvement in WGA binding to CHO cells.

scholarly journals Enzymatic basis for a lectin-resistant phenotype: increase in a fucosyltransferase in mouse melanoma cells.

1982 ◽  
Vol 92 (2) ◽  
pp. 277-282 ◽  
Author(s):  
J Finne ◽  
M M Burger ◽  
J P Prieels
Keyword(s):  
Sialic Acid ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Regulatory Gene ◽  
Fold Increase ◽  
Melanoma Cells ◽  
Sialic Acid Content ◽  
Biochemical Basis ◽  
Mouse Melanoma ◽  
Increased Sensitivity

In the search for the biochemical basis of the control of glycosylation of cell surface carbohydrates, revertant clones were isolated from previously characterized wheat germ agglutinin-resistant clones of B16 mouse melanoma cells by selection for resistance to Lotus tetragonolobus lectin or to ricin. Comparison of the wheat germ agglutinin-resistant clones with the parent and revertant clones indicated that this phenotype was correlated with an increased sensitivity to the Lotus lectin, a 60- to 70-fold increase in alpha 1 leads to 3 fucosyltransferase activity and a decreased sialic acid content of the N-glycosidic chains of glycoproteins. The results suggest a novel type of control mechanism for lectin resistance, an increase in a glycosyltransferase activity. The presence of alpha 1 leads to 3 bound fucose on N-acetylglucosamine residues would interfere with the addition of sialic acid by alpha 2 leads to 3 linkages to galactose residues in the carbohydrate units, and this change could explain the resistance to wheat germ agglutinin and the increased sensitivity to the Lotus lectin. A change in a regulatory gene for the fucosyltransferase as a possible primary cause for the changed phenotype is discussed.

A hypothesis on the traffic of MG160, a medial Golgi sialoglycoprotein, from the trans-Golgi network to the Golgi cisternae

1994 ◽  
Vol 107 (3) ◽  
pp. 529-537 ◽  
Author(s):  
P.A. Johnston ◽  
A. Stieber ◽  
N.K. Gonatas
Keyword(s):  
Sialic Acid ◽  
Golgi Apparatus ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Brefeldin A ◽  
Retrograde Transport ◽  
Transport Pathway ◽  
Trans Golgi Network ◽  
Covalently Linked ◽  
Golgi Network

We have reported that MG160, an intrinsic membrane sialoglycoprotein of the Golgi apparatus (GA), resides in the medial cisternae of the organelle (Gonatas et al. (1989) J. Biol. Chem. 264, 646–653). In order to resolve the question whether MG160 acquires sialic acid residues in the trans cisternae or trans-Golgi network (TGN) prior to its retrograde transport, we have examined the effects of brefeldin A (BFA) on the post-translational processing of MG160, and the distribution of internalized wheat germ agglutinin covalently linked with HRP (WGA-HRP), which labels the TGN (Gonatas et al. (1977) J. Cell Biol. 73, 1–13). In BFA-treated PC12 cells, MG160 acquires resistance to endo H, but fails to be sialylated. This effect occurs in parallel with the redistribution of MG160 into an ER compartment dispersed throughout the cytoplasm including the nuclear envelope, and the collapse of the WGA-HRP-labelled TGN into vesicles and tubules surrounding the centriole. These results suggest that MG160 is not sialylated in BFA-treated cells because it is sequestered from the sialyltransferase enzyme(s), presumably located in the TGN, and provide evidence supporting the hypothesis for a retrograde transport pathway that recycles resident GA proteins, including MG160, between the Golgi cisternae and the TGN. To examine further the above hypothesis we studied cells treated with BFA and then allowed to recover from the effect of the drug for various lengths of time. After 15 minutes of recovery, cisternae of the Golgi apparatus, typically found in the pericentriolar region, are labeled by both MG160 and WGA-HRP.(ABSTRACT TRUNCATED AT 250 WORDS)

Generation of a dynamic combinatorial library using sialic acid aldolase and in situ screening against wheat germ agglutinin

Tetrahedron ◽  
2004 ◽  
Vol 60 (3) ◽  
pp. 771-780 ◽  
Author(s):  
Roger J. Lins ◽  
Sabine L. Flitsch ◽  
Nicholas J. Turner ◽  
Ed Irving ◽  
Stuart A. Brown
Keyword(s):  
Sialic Acid ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Combinatorial Library ◽  
Dynamic Combinatorial Library ◽  
Sialic Acid Aldolase

scholarly journals Membrane glycoproteins of the nerve growth cone: diversity and growth regulation of oligosaccharides.

1986 ◽  
Vol 103 (4) ◽  
pp. 1369-1382 ◽  
Author(s):  
L M Greenberger ◽  
K H Pfenninger
Keyword(s):  
Sialic Acid ◽  
Growth Cone ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Growth Regulation ◽  
Binding Proteins ◽  
Ricinus Communis ◽  
Lectin Binding ◽  
Adult Brain ◽  
Two Dimensional

A subcellular fraction prepared from fetal rat brain and enriched in growth cone membranes is analyzed for its lectin-binding proteins. Growth-associated glycoproteins are identified by comparing the growth cone glycoproteins with those of synaptosomes. Protein was resolved in one- or two-dimensional gels, electroblotted, and blots probed with radioiodinated concanavalin A, wheat germ agglutinin, and Ricinus communis agglutinins I and II. In one-dimensional gels, each lectin recognizes approximately 20 polypeptides (with substantial overlap) most of which migrate diffusely and have relatively high molecular masses (range 30-200 kD). The seven major Coomassie-staining proteins of the membrane fraction (34-52 kD) are not the major lectin-binding proteins. In two-dimensional gels, the lectin-binding proteins are either streaked across the pH gradient or exist as multiple spots, indicating broad charge heterogeneity. Seven wheat germ agglutinin- and Ricinus communis agglutinin II-binding glycoproteins are present in greater abundance in growth cone fractions compared with synaptosomes. Most notably, an acidic, sialic acid-rich protein (27-30 kD, pI 4.0; termed gp27-30) is most abundant at postnatal day 4, but absent from adult brain. The protein's very acidic isoelectric point is due, at least in part, to its high sialic acid content. Growth regulation of specific protein-linked oligosaccharides suggests that they play a special role in growth cone function. In addition, the great diversity of growth cone glycoproteins from whole brain suggests glycoprotein heterogeneity among growth cones from different neuron types.

scholarly journals Isolation and partial characterization of the major sialoglycoprotein of human T-lymphoblastoid cells of a MOLT-4B cell line

1978 ◽  
Vol 175 (3) ◽  
pp. 823-831 ◽  
Author(s):  
M Saito ◽  
S Toyoshima ◽  
T Osawa
Keyword(s):  
Sialic Acid ◽  
Cell Line ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Ricinus Communis ◽  
Exchange Chromatography ◽  
Total Carbohydrate ◽  
Lymphoblastoid Cells ◽  
Sugar Chain ◽  
Sugar Chains

A sialoglycoprotein with an approx. mol.wt. of 95000 was isolated from human lymphoblastoid cells of a MOLT-4B cell line, which was of human T-lymphocyte origin, by ion-exchange chromatography, affinity chromatography on a column of wheat-germ agglutinin-Sepharose and preparative slab-gel electrophoresis. The localization of this glycoprotein on the cell surface was indicated by surface labelling by the periodate/NaB3H4 and lactoperoxidase-catalysed iodination methods. Carbohydrate analyses of this glycoprotein revealed that its total carbohydrate content is 28% (w/w), and it contains fucose, galactose, mannose, N-acetylglucosamine, N-acetylgalactosamine and sialic acid in molar proportions 1.0:4.0:3.7:3.5:1.2:2.5, suggesting that it has two types of sugar chain, i.e. sugar chains like those of serum glycoproteins and sugar chains of the type found in mucins. Actually, alkaline borohydride treatment of this glycoprotein yielded tri- and tetra-saccharide, the latter containing 1 molecule of fucose in addition to each molecule of galactose, N-acetylgalactosamine and sialic acid. This glycoprotein bound to Ricinus communis agglutinin and concanavalin A as well as to wheat-germ agglutinin.

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