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Sialyltransferases in young rat brain.

J A Dain, S S Ng

    Advances in Experimental Medicine and Biology
    |January 1, 1980
    PubMed
    Summary

    In young rats, more sialic acid (NeuNAc) attaches to glycolipids than glycoproteins. Different enzymes handle these processes, primarily in Golgi and microsomal membranes.

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    Area of Science:

    • Neuroscience
    • Biochemistry
    • Cell Biology

    Background:

    • Sialylation, the addition of sialic acid (NeuNAc), is crucial for brain development.
    • Glycolipids and glycoproteins are key cellular components involved in various biological functions.

    Purpose of the Study:

    • To investigate the differential utilization of sialic acid (NeuNAc) acceptors in developing rat brains.
    • To characterize the sialyltransferases involved in modifying glycolipids and glycoproteins.
    • To determine the subcellular localization of these sialyltransferase activities.

    Main Methods:

    • Analysis of sialyltransferase activity using CMP-NeuNAc as a substrate.
    • Characterization of glycolipid and glycoprotein acceptors in rat brain fractions.
    • Subcellular fractionation using sucrose gradients and enzyme marker studies.
    • Electron microscopy for localization studies.

    Main Results:

    • Glycolipid acceptors (Cer-Glc-Gal and GM1 ganglioside) showed higher affinity for NeuNAc than glycoproteins in 11-15 day old rat cerebra.
    • Distinct sialyltransferases were identified for glycolipid and glycoprotein substrates.
    • Sialyltransferase activities were primarily localized to smooth microsomal membranes and Golgi complex derivatives, not synaptosomes.
    • The apparent Km for CMP-NeuNAc was consistent across all studied sialyltransferase reactions.

    Conclusions:

    • Developing rat brains exhibit preferential sialylation of glycolipids over glycoproteins.
    • Specific sialyltransferases and their distinct subcellular localizations (Golgi, microsomes) are involved in these pathways.
    • These findings contribute to understanding the regulation of glycoconjugate synthesis in the brain.

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