Pro‐subtilisin E: purification and characterization of its autoprocessing to active subtilisin E in vitro
- 1 February 1990
- journal article
- research article
- Published by Wiley in Molecular Microbiology
- Vol. 4 (2), 295-304
- https://doi.org/10.1111/j.1365-2958.1990.tb00596.x
Abstract
The formation of active subtilisin E from pro‐subtilisin E requires the removal of the N‐terminal pro‐sequence of 77 residues. Pro‐subtilisin E produced in Escherichia coli using a pINIII‐ompA vector was first extracted with 6M guanidine‐HCl and 5M urea and purified to homogeneity in the presence of 5M urea. Upon drop dialysis against 0.2M sodium phosphate buffer (pH 6.2), the purified pro‐subtilisin in 5M urea was processed to active subtilisin of which the N‐terminal sequence and migration in SDS‐polyacrylamide gel electrophoresis were identical to those of authentic active subtilisin E. This process was found to be very sensitive to the ionic strengths and anions used. Under the optimum conditions (dialysis against 0.5 M (NH4)2SO4 and 1 mM CaCl2 in 10mM Tris‐HCl buffer (pH 7.0) at 4°C for 1 h), approximately 20% of pro‐subtitisin E was converted to active subtilisin E. The activation process was not inhibited by Streptomyces subtilisin inhibitor, and pro‐subtiiisin E in which the active site was mutated (Asp32 to Asn) was unable to be processed under the optimum conditions. These results confirmed the previous hypothesis that the processing of pro‐subtilisin occurs by an intramolecular, autoprocessing mechanism.This publication has 40 references indexed in Scilit:
- Effects of ammonium sulfate on the unfolding and refolding of the variable and constant fragments of an immunoglobulin light chainBiochemistry, 1988
- Protein engineering of subtilisin BPN': enhanced stabilization through the introduction of two cysteines to form a disulfide bondBiochemistry, 1987
- Electrostatic effects on modification of charged groups in the active site cleft of subtilisin by protein engineeringJournal of Molecular Biology, 1987
- Tailoring the pH dependence of enzyme catalysis using protein engineeringNature, 1985
- Role of bound calcium ions in thermostable, proteolytic enzymes. Separation of intrinsic and calcium ion contributions to the kinetic thermal stabilityBiochemistry, 1976
- Complex formation of microbial alkaline protease inhibitor (S-SI) with subtilisin BPN' and its properties.Agricultural and Biological Chemistry, 1974
- Isolation and Crystallization of Microbial Alkaline Protease Inhibitor, S-SIAgricultural and Biological Chemistry, 1973
- S-SI, a New Alkaline Protease Inhibitor from Streptomyces albogriseolns S-3253Agricultural and Biological Chemistry, 1972
- Structure of Subtilisin BPN′ at 2.5 Å ResolutionNature, 1969
- Neutral Salts: The Generality of Their Effects on the Stability of Macromolecular ConformationsScience, 1964