Summary
Isolated cytoplasmic membranes from Micrococcus lysodeikticus were able to incorporate [14C]mannose from GDP-[14C]mannose. Labelled mannose remained in the membrane fraction after its repeated washing and lipid extraction. Sodium dodecyl sulfate gel electrophoresis in 12% acrylamide showed a set of bands with molecular weights ranging from 230 000 to 19 000 which stained for protein and carbohydrate, and incorporated [14C]mannose. Some of these bands reacted with different lectins (concanavalin A, wheat germ agglutinin and ricin).
Furthermore, the mannose was incorporated via a glycosylation pathway similar to that followed in eukaryotic system as shown by the preliminary identification of a lipid intermediate transfering the sugar to proteins and by the differential sensitivity to bacitracin and tunicamycin.
These complex membrane components were sensitive to digestion with pronase. All the results presented suggest their glycoprotein nature.
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Guerrero, A., Muñoz, E. & Larraga, V. Mannose incorporation and lectin recognition of pronase-sensitive components in Micrococcus lysodeikticus (M. luteus) membranes. Mol Cell Biochem 69, 169–178 (1986). https://doi.org/10.1007/BF00224764
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DOI: https://doi.org/10.1007/BF00224764