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Label-fracture of plasma membranes isolated from measles virus-infected cells

G Rutter and H Hohenberg

Heinrich-Pette-Institut fur Experimentelle Virologie und Immunologie, Universitat Hamburg, Germany.

We present a method that permits correlation of the intramembrane architecture of plasma membrane fracture faces with the distribution of specific molecules at the corresponding cytoplasmic or exoplasmic membrane surfaces. HeLa cells infected with measles virus were used as a model system. Large fragments of the dorsal membrane were isolated after the virus glycoproteins were tagged at the outer cell surface with immune serum and protein A-gold markers. In a second step, different virus polypeptides at the inner cell surface were also identified by a smaller gold label. Thereafter, the isolated plasma membranes were frozen and freeze-fractured. The complementary fracture faces were shadowed with heavy metals and carbon and examined in the transmission electron microscope without cleaning of remaining biological material. Thus, the micromorphology of the replicated fracture faces and the topochemistry of virus components localized at the corresponding leaflets of the plasmalemma could be seen on the same image at high resolution. Of note is that the freeze-fracture morphology of the protoplasmic face is related to the molecular composition of the cytoplasmic surface, as revealed by antibody tagging.

Volume 41, Issue 7, pp. 1085-1091, 07/01/1993
Copyright © 1993 by The Histochemical Society


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