ARTICLE

SYNTHESIS OF GLYCOPROTEINS IN A SINGLE IDENTIFIED NEURON OF APLYSIA CALIFORNICA

¹ From the Department of Microbiology, New York University Medical School, and The Public Health Research Institute of The City of New York, Inc., New York 10016

Incorporation of L-[³H]fucose into glycoproteins was studied in R2, the giant neuron in the abdominal ganglion of Aplysia. [³H]fucose injected directly into the cell body of R2 was readily incorporated into glycoproteins which, as shown by autoradiography, were confined almost entirely to the injected neuron. Within 4 h after injection, 67% of the radioactivity in R2 had been incorporated into glycoproteins; at least 95% of these could be sedimented by centrifugation at 105,000 g, suggesting that they are associated with membranes. Extraction of the particulate fraction with sodium dodecyl sulfate (SDS), followed by gel filtration on Sephadex G-200 and polyacrylamide gel electrophoresis in SDS revealed the presence of only five major radioactive glycoprotein components which ranged in apparent molecular weight from 100,000 to 200,000 daltons. Similar results were obtained after intrasomatic injection of [³H]N-acetylgalactosamine. Mild acid hydrolysis of particulate fractions released all of the radioactivity in the form of fucose. When ganglia were incubated in the presence of [³H]fucose, radioactivity was preferentially incorporated into glial cells and connective tissue. In contrast to the relatively simple electrophoretic patterns obtained from cells injected with [³H]fucose, gel profiles of particulate fractions labeled with [¹⁴C]valine were much more complex.

CiteULike    Complore    Connotea    Del.icio.us    Digg    Facebook    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

• Sherbany, A., Ambron, R., Schwartz, J. (1979). Membrane glycolipids: regional synthesis and axonal transport in a single identified neuron of Aplysia californica. Science 203: 78-80 [Abstract]  
• Schwartz, J. H., Goldman, J. E., Ambron, R. T., Goldberg, D. J. (1976). Axonal Transport of Vesicles Carrying [3H]Serotonin in the Metacerebral Neuron of Aplysia californica. Cold Spring Harb Symp Quant Biol 40: 83-92 [Abstract]  

Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents