Abstract
Ferritin-conjugated concanavalin A (ConA) was used as an electron-opaque tracer to study the distribution of oligosaccharides on nuclear envelopes isolated from amphibian oocytes. ConA was not detected in the pore complexes or along the nucleoplasmic or cytoplasmic surfaces of the envelope. However, lectin binding did occur along the membrane surfaces which line the perinuclear space, and the binding reaction could be inhibited by preincubating the ferritin-conjugated ConA with α-methyl-mannoside.
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