PMID: 8955884Nov 1, 1996Paper

Activation of the intracellular Ca(2+)-dependent serine protease ISP1 of bacillus megaterium by purification or by high Ca2+ concentrations

Biochemistry and Molecular Biology International
L Váchová

Abstract

The total proteolytic activity of ISP1 determined after its partial purification by size exclusion HPLC increased 3.0, 7.3 and 27.3 times in sporulating, growing and netropsin-treated cells, respectively, as compared with the corresponding original activity in crude cytoplasmic preparations at the same CaCl2 concentration of 3 mM. A similar rise in proteolytic activity occurred on increasing the Ca2+ concentration in the crude cytoplasm from 3 to 30 mM. This activation in the cytoplasm of netropsin-treated and sporulating cells was not reversed by subsequent lowering of CaCl2 concentration back to 3 mM by dialysis. Moreover, a similar activation appeared even after the same dialysis of cytoplasm that had not been exposed to 30 mM CaCl2. The activation was probably due to the processing of ISP1, as established by SDS-PAGE and immunoblotting, but an involvement of additional regulation factor(s), e.g. an inhibitor or other molecules, is possible.

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