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. 1980 Feb;141(2):493–501. doi: 10.1128/jb.141.2.493-501.1980

Extracellular and membrane-bound proteases from Bacillus subtilis.

P Mäntsälä, H Zalkin
PMCID: PMC293652  PMID: 6154033

Abstract

Bacillus subtilis YY88 synthesizes increased amounts of extracellular and membrane-bound proteases. More than 99% of the extracellular protease activity is accounted for by an alkaline serine protease and a neutral metalloprotease. An esterase having low protease activity accounts for less than 1% of the secreted protease. These enzymes were purified to homogeneity. Molecular weights of approximately 28,500 and 39,500 were determined for the alkaline and neutral proteases, respectively. The esterase had a molecular weight of approximately 35,000. Amino-terminal amino acid sequences were determined, and the actions of a number of inhibitors were examined. Membrane vesicles contained bound forms of alkaline and neutral proteases and a group of previously undetected proteases (M proteases). Membrane-bound proteases were extracted with Triton X-100. Membrane-bound alkaline and neutral proteases were indistinguishable from the extracellular enzymes by the criteria of molecular weight, immunoprecipitation, and sensitivity to inhibitors. The M protease fraction accounted for approximately 7% of the total activity in Triton X-100 extracts of membrane vesicles. The M protease fraction was partially fractionated into four species (M1 through M4) by ion-exchange chromatography. Immunoprecipitation and sensitivity to inhibitors distinguished membrane-bound alkaline and neutral proteases from M proteases. In contrast to alkaline and neutral proteases, proteases M2 and M3 exhibited exopeptidase activity.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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