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A well-defined antigen/antibody system was used to evaluate the effect of immune tolerance on the spectrum of specificities of natural antibodies. The antibody used in this study, anti-Gal, is a naturally occurring, polyclonal IgG that constitutes 1% of the circulating IgG in humans. We have previously shown that anti-Gal, purified from AB sera,(More)
Alpha 1,3-fucosyltransferases (FucT) share a conserved amino acid sequence designated the alpha 1,3 FucT motif that has been proposed to be important for nucleotide sugar binding. To evaluate the importance of the amino acids in this motif, each of the alpha 1,3 FucT motif amino acids was replaced with alanine (alanine scanning mutagenesis) in human FucT(More)
The antibodies that are produced in man as a result of specific vaccination or infectious disease comprise only a small proportion of the bulk of the IgG molecules circulating in the blood. The immunity towards these antigens is attributed mostly to a relatively high number of memory cells and a low titer of synthesized antibodies. In view of kinetic(More)
Gangliosides from normal leukocytes and the cells of 25 patients with acute and chronic leukemia were tested for the presence of the disialoganglioside II3-alpha-N-acetylneuraminosyl-alpha 2----8-N-acetylneuraminosyllactosylceramide (GD3). GD3 was detected by immunostaining thin-layer chromatographs with an anti-GD3 monoclonal antibody (AbR24). Among the(More)
Determining the number and location of disulfide bonds within a protein provide valuable insight into the protein's three-dimensional structure. Purely computational methods that predict the bonded cysteine pairings given a protein's primary structure have limitations in both prediction correctness and the number of bonds that can be predicted. Our approach(More)
Glycoproteomics has emerged as a prime area of interest within the field of proteomics because glycoproteins have been shown to function as biomarkers for disease and as promising therapeutic targets. A significant challenge in the study of glycoproteins is the fact that they are expressed in relatively low abundance in cells. In response, various(More)
Human leukemia cell gangliosides were found to inhibit in vitro activation of human lymphocytes by lectins and the soluble antigen Candida albicans at concentrations as low as 2 micrograms/2 X 10(5) lymphocytes/0.2-ml cultures. The inhibition was not due to a reduction in the number of viable cells, but to an inhibition of blast formation. Three(More)
The tertiary structure and biological function of a protein can be better understood given knowledge of the number and location of its disulfide bonds. By utilizing mass spectrometric (MS) experimental procedures that produce spectra of the protein's peptides joined by a disulfide bond, we can make initial identifications of these bonded cysteine pairings.(More)
Emigration of leukocytes from the circulation into tissue by transendothelial migration, is mediated subsequently by adhesion molecules such as selectins, chemokines and integrins. This multistep paradigm, with multiple molecular choices at each step, provides a diversity in signals. The influx of neutrophils, monocytes and lymphocytes into inflamed tissue(More)
In this issue of the journal, the study by Castronovo et al. on the binding of the natural anti-a-galactosyl IgG (anti-Gal) antibody to human mammary carcinoma cell lines and to cells of primary malignant mammary lesions poses two challenging questions, (a) Is the expression of the Galal-3Gal epitopes a common characteristic of human malignant cells? (b)(More)