Functional Reconstitution in Escherichia Coli of the Yeast Mitochondrial Matrix Peptidase from Its Two Inactive Subunits

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1993 Jul 1

PMID 8327505

Citations 6

Authors

V Geli

Affiliations

Soon will be listed here.

Abstract

The matrix processing peptidase from yeast (Saccharomyces cerevisiae) mitochondria was expressed in Escherichia coli via a plasmid-borne operon encoding the mature forms of the alpha and beta subunits of the enzyme. The subunits assembled into a fully active, soluble enzyme. The mature subunits were also expressed individually. The alpha subunit accumulated in large amounts and was obtained at a purity of 80% after a single chromatographic step. The beta-subunit-producing strain expressed an intact and a degraded form of the beta subunit, both of them soluble in the cytoplasm. Extract from either the alpha- or the beta-subunit-producing strain (S-alpha or S-beta extract, respectively), as well as the purified alpha subunit, was enzymatically inactive. However, precursor cleavage activity was restored by mixing either the S-alpha extract or the purified alpha subunit with the S-beta extract. The reconstituted processing activity was indistinguishable from the authentic holopeptidase.

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