Studies on the Secretion of Blood Group Substances

2015 ◽  
pp. 67-74
Author(s):  
Ph. Sturgeon ◽  
Minerva B. Arcilla
Keyword(s):  
Blood Group ◽  
Blood Group Substances

scholarly journals The macromolecular properties of blood-group-specific glycoproteins. Characterization of a series of fractions obtained by density-gradient ultracentrifugation

1974 ◽  
Vol 143 (3) ◽  
pp. 669-679 ◽  
Author(s):  
K. Ramakrishnan Bhaskar ◽  
J. Michael Creeth
Keyword(s):  
Density Gradient ◽  
Blood Group ◽  
Buoyant Density ◽  
Physicochemical Characterization ◽  
Cyst Fluid ◽  
Equilibrium Density ◽  
Density Gradient Ultracentrifugation ◽  
Molecular Weights ◽  
Molar Ratios ◽  
Blood Group Substances

1. Equilibrium density-gradient ultracentrifugation in caesium salts was used in two stages in the isolation and subfractionation of the glycoprotein component from a human ovarian-cyst fluid. The eight main subfractions thus obtained were the subject of detailed physicochemical characterization. 2. The fractions were unimodal in buoyant-density distribution, but had discrete ρ0 values ranging from 1.31 to 1.35. 3. Weight-average molecular weights and sedimentation coefficients decreased regularly with decreasing density of the fraction, whereas the partial specific volumes and selective solvation parameters increased. The latter behaviour correlates well with the increasing peptide content of the lighter fractions. 4. The fractions exhibited a range of analytical composition, although all were within the limits previously observed for blood-group substances of Lea specificity. All fractions had approximately equal Lea activity. The peptide content varied systematically from 7% for the densest fraction to 15% for the lightest, but the relative distributions of the amino acids remained essentially constant throughout the series. In particular, serine plus threonine plus proline made up about 50% of the peptide content of all the fractions. Fucose, galactose and N-acetylglucosamine contents decreased with increasing peptide content of the fractions, but N-acetylgalactosamine and sialic acid exhibited the opposite trend. Molar ratios of N-acetylgalactosamine to the sum of serine and threonine remained essentially constant at 0.8–0.9, implying a high degree of glycosylation of all the molecules, but the ratio of N-acetylglucosamine to N-acetylgalactosamine decreased steadily with increasing peptide content, suggesting the presence of oligosaccharide side chains of various lengths. The results are discussed in terms of the accepted structure of glycoprotein molecules. 5. Experiments on the glycoproteins extracted with phenol from the same cyst fluid have confirmed that equilibrium centrifugation in caesium salts does not remove any non-covalently bound protein nor cause any changes in the tertiary structures of these glycoprotein molecules.

Blood group substances, Forssman and mononucleosis antigens in lipid-containing RNA viruses

1966 ◽  
Vol 19 (3) ◽  
pp. 273-288 ◽  
Author(s):  
Rudolf Rott ◽  
Rudolf Drzeniek ◽  
Mohamed S. Saber ◽  
Edgar Reichert
Keyword(s):  
Blood Group ◽  
Rna Viruses ◽  
Blood Group Substances

Gel filtration of ABH blood group substances

1973 ◽  
Vol 84 (2) ◽  
pp. 335-346 ◽  
Author(s):  
A. Fiori ◽  
G. Panari ◽  
G.V. Giusti ◽  
G. Brandi
Keyword(s):  
Blood Group ◽  
Gel Filtration ◽  
Blood Group Substances

scholarly journals Amphibian Blood Group Substances. I

1969 ◽  
Vol 45 (10) ◽  
pp. 974-979 ◽  
Author(s):  
Shigeru YAMAMOTO ◽  
Shoei ISEKI
Keyword(s):  
Blood Group ◽  
Blood Group Substances
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