𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Cell surface galactosyltransferase: Immunochemical localization

✍ Scribed by Nancy L. Shaper; Paul L. Mann; Joel H. Shaper

Book ID
102878563
Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
730 KB
Volume
28
Category
Article
ISSN
0730-2312

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✦ Synopsis

A cell surface UDP-galactose: N-acetylglucosamine galactosyltransferase (GT) has been directly localized on bovine cells in tissue culture by immunohistochemical techniques. A conventional rabbit heteroantiserum was prepared against an affnity-purified soluble form of GT from bovine milk, and a monospecific IgG fraction was isolated by affinity chromatography on a GT adsorbent. As demonstrated by indirect immunofluorescence, antigen to this antibody is present on the surface of all three bovine cell lines tested. It was uniformly distributed over the exposed membrane surface of fixed cells. Exposure of living cells to the anti-GT antibody resulted in its time-dependent aggregation in the plane of the membrane. Antigen (GT) was released from the membrane surface by trypsin digestion, and its reappearance required protein synthesis, since cycloheximide effectively prevented repopulation of the cell surface.

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