Destructive twisting of neutral metalloproteases: the catalysis mechanism of the Dispase autolysis-inducing protein from Streptomyces mobaraensis DSM 40487

The FEBS Journal
David FiebigHans-Lothar Fuchsbauer

Abstract

The Dispase autolysis-inducing protein (DAIP) is produced by Streptomyces mobaraensis to disarm neutral metalloproteases by decomposition. The absence of a catalytic protease domain led to the assumption that the seven-bladed β-propeller protein DAIP causes structural modifications, thereby triggering autolysis. Determination of protein complexes consisting of DAIP and thermolysin or DAIP and a nonfunctional E138A bacillolysin variant supported this postulation. Protein twisting was indicated by DAIP-mediated inhibition of thermolysin while bacillolysin underwent immediate autolysis under the same conditions. Interestingly, an increase in SYPRO orange fluorescence allowed tracking of the fast degradation process. Similarly rapid autolysis of thermolysin mediated by DAIP was only observed upon the addition of amphiphilic compounds, which probably amplify the induced structural changes. DAIP further caused degradation of FITC-labeled E138A bacillolysin by trypsin, as monitored by a linear decrease in fluorescence polarization. The kinetic model, calculated from the obtained data, suggested a three-step mechanism defined by (a) fast DAIP-metalloprotease complex formation, (b) slower DAIP-mediated protein twisting, and (c) fragment...Continue Reading

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