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The infectivity of avian RNA tumor viruses was inactivated to varying degrees by treatment with either concanavalin A (Con A) or phytohemagglutinin but not by treatment with wheat germ agglutinin. In general, leukosis viruses reacted preferentially with Con A, whereas sarcoma viruses showed more affinity for phytohemagglutinin. In a more extensive study with subgroup A of Prague Rous sarcoma virus (PR-A), the effect of inactivation by Con A could be specifically prevented by the addition of α-methyl-d -mannoside, α-methyl-d -glucoside, andN -acetyl-d -glucosamine. These sugars were also capable of eluting [3 H]glucosamine-labeled material from disrupted PR-A virus, which was bound to a Con A-sepharose affinity column. A major viral glycoprotein recovered from the column had the same mobility as gp85 in polyacrylamide gel electrophoresis and could be immunoprecipitated with anti-gp85 antiserum. These results suggest that the material reacting with Con A is present on the gp85 component of the viral glycoprotein. The diversity in the reactivity of the glycoproteins of transforming and nontransforming viruses with plant lectins is discussed.

Reactivity of Avian RNA Tumor Viruses with Lectins