Document Detail

Pallidin. Purification and characterization of a carbohydrate-binding protein from Polysphondylium pallidum implicated in intercellular adhesion.
MedLine Citation:
PMID:  1238118     Owner:  NLM     Status:  MEDLINE    
A carbohydrate-binding protein from Polysphondylium pallidum, a species of cellular slime mold, was purified to homogeneity by adsorption to formalinized erythrocytes and elution with D-galactose. The protein, for which we propose the name PALLIDIN, is assayed by its activity as an agglutinin of erythrocytes. It was previously shown to have different carbohydrate-binding specificities than discoidin, a carbohydrate-binding protein from Dictyostelium discoideum, another species of slime mold. Evidence has been presented previously that each of these proteins is detectable on the cell surface. In the present report we show that the physico-chemical properties of pallidin are different from discoidin. Pallidin has a subunit molecular weight of 24 800 +/- 1100 determined by polyacrylamide electrophoresis in the presence of dodecyl sulfate and 2-mercaptoethanol, compared to 26 100 +/- 1000 for discoidin. The weight-average molecular weight of pallidin is 250 000 +/- 50 000 determined by equilibrium sedimentation in the presence of D-galactose compared to 100 000 +/- 2000 for discoidin. In equilibrium sedimentation studies, pallidin exhibited some heterogeneity at equilibrium while discoidin was homogeneous. The amino acid composition of pallidin is generally similar but clearly different from the composition of discoidin. The isoelectric point of pallidin is 7.0 compared to 6.1 for discoidin. Like discoidin, pallidin contains no detectable hexosamine or neutral sugar. These results establish that agglutinins from two species of cellular slime molds are distinct. The different properties of the cell-surface agglutinins, pallidin and discoidin, are consistent with their suggested role in species-specific cellular recognition and adhesion in the species of slime mold from which they are derived.
D L Simpson; S D Rosen; S H Barondes
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  412     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  1975 Nov 
Date Detail:
Created Date:  1976-02-20     Completed Date:  1976-02-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  109-19     Citation Subset:  IM    
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MeSH Terms
Amino Acids / analysis
Carbohydrate Metabolism
Cell Adhesion
Fungal Proteins / analysis*,  isolation & purification,  metabolism
Hemagglutination Tests
Hexosamines / analysis
Macromolecular Substances
Molecular Weight
Myxomycetes / analysis*,  metabolism
Protein Binding
Receptors, Drug*
Reg. No./Substance:
0/Amino Acids; 0/Fungal Proteins; 0/Hexosamines; 0/Macromolecular Substances; 0/Receptors, Drug

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