Use of prokaryotic-derived probes to identify poly(sialic acid) in neonatal neuronal membranes.
- 1 April 1984
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 81 (7), 1971-1975
- https://doi.org/10.1073/pnas.81.7.1971
Abstract
Three prokaryotic-derived probes to identify and study the temporal expression of polysialosyl units in neuronal tissue were developed. A polyclonal antibody, a bacteriophage-derived endo-neuraminidase and an Escherichia coli K1 sialyltransferase are all specific for either recognizing or synthesizing poly(sialic acid) containing .alpha.-2,8-ketosidic linkages. Polysialosyl immunoreactivity with apparent MW values of 180,000-240,000 was specific for developing neuronal tissue; it was not detected in neonatal liver or kidney or in adult brain tissue. The developmentally regulated disappearance in poly(sialic acid) is consistent with the probes described here recognizing the polysialosyl carbohydrate units of a neuronal cell adhesion molecule (N-CAM). Treatment of brain extracts with a bacteriophage-derived endo-neuraminidase specific for .alpha.-2,8-linked polysialosyl units abolished the immunoreactivity. The material solubilized by endo-neuraminidase was isolated, reduced with borotritide, and shown to contain oligomers of sialic acid with 3-6 sialyl units. Treatment of the 3H-labeled oligosialic acid with exo-neuraminidase quantitatively converted the radioactivity to sialitol, establishing that the brain-derived oligomers were composed solely of sialic acid. A membranous sialyltransferase from E. coli K1 that can transfer sialic acid to exogenous acceptors of oligo- or poly(sialic acid) also recognized rat brain membranes, further substantiating the presence of poly(sialic acid) in rat brain. This was confirmed by using a mutant of E. coli K1 defective in the synthesis of poly(sialic acid) and could only transfer sialic acid to exogenous acceptors of oligo- or poly(sialic acid). Sialyl polymer synthesis was restored in the mutant when brain membranes were added as exogenous acceptor.Keywords
This publication has 19 references indexed in Scilit:
- ANTIGENIC SIMILARITIES BETWEEN BRAIN COMPONENTS AND BACTERIA CAUSING MENINGITISThe Lancet, 1983
- Molecular topography of the neural cell adhesion molecule N-CAM: surface orientation and location of sialic acid-rich and binding regions.Proceedings of the National Academy of Sciences, 1983
- Occurrence of α2–8 linked polysialosyl units in a neural cell adhesion moleculeBiochemical and Biophysical Research Communications, 1983
- Occurrence of unique polysialosyl carbohydrate units in glycoproteins of developing brain.Journal of Biological Chemistry, 1982
- EPIDEMIOLOGY OF ESCHERICHIA COLI K1 IN HEALTHY AND DISEASED NEWBORNSThe Lancet, 1975
- The sialic acids. XII. Synthesis of colominic acid by a sialyltransferase from Escherichia coli K-235.1971
- Cleavage of Structural Proteins during the Assembly of the Head of Bacteriophage T4Nature, 1970
- The Structure and Chemistry of Colominic Acid*Biochemistry, 1964
- THE PREPARATION OF 131I-LABELLED HUMAN GROWTH HORMONE OF HIGH SPECIFIC RADIOACTIVITYBiochemical Journal, 1963
- The Thiobarbituric Acid Assay of Sialic AcidsJournal of Biological Chemistry, 1959