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Pubmed ID :8373381
Publication Date : 1993/10/12

Characterization of a secreted form of human furin endoprotease.


Human furin, a member of a recently discovered family of cellular endoproteases, has been identified as a membrane bound protein localized in the Golgi apparatus. Here, we report the presence of a secreted form of furin in the media of cells infected with a vaccinia virus recombinant containing the furin gene. Using the fluorogenic substrate boc-Arg-Val-Arg-Arg-MCA, endoproteolytic activity was detected in the media of infected BSC40 cells. Immunoprecipitations of [35S]-labeled proteins from infected cells revealed that the media contained a lower molecular form of furin than the cellular furin or than a previously characterized soluble furin mutant, hFUR713t. By using the direct linear plot representation of the Michaelis-Menten equation the results demonstrate that the soluble furin exhibited similar kinetics to the hFUR713t enzyme. Thus, our results suggest that membrane-bound furin undergoes post-translational processing to produce a soluble form of the enzyme that can be secreted.

Authors : Vidricaire G , Denault J B , Leduc R ,

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