Alpha 2-macroglobulin used to isolate intracellular endopeptidases from mammalian cells in culture.


Extracts of cell cultures labelled with [3H]leucine were incubated with human alpha 2-macroglobulin (alpha 2M), a plasma proteinase inhibitor. The proteinase-alpha 2M complexes were then precipitated with immobilized monoclonal antibodies to alpha 2M and analysed by SDS/polyacrylamide-gel electrophoresis. Parallel experiments were done with methylamine… (More)


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