Purification and characterization of a secreted protease from the pathogenic marine bacterium vibrio anguillarum

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Abstract

Vibrio anguillarum is a pathogenic marine bacterium which causes the disease vibriosis in salmonid fish, which is characterized by a fatal hemorrhagic septicemia accompanied by massive tissue destruction. In this paper, the purification of the major caseinolytic extracellular protease from V. anguillarum is presented. The purification steps include ammonium sulfate precipitation, DEAE-Sepharose chromatography, Sephacryl S-200 chromatography, and DEAE high-pressure liquid chromatography. The purified protease migrates with Mr = 38000 upon sodium dodecyl sulfate-polyacrylamide gel electrophoresis. A slightly larger protease of Mr 40000 is also separated by this procedure, but accounts for only a minor fraction of the caseinolytic activity. The Mr 38 000 protease displays a broad pH activity profile in the neutral to basic range. It is not inhibited by serine, cysteine, or acid protease inhibitors, but is inhibited by EDTA and 1,10-phenanthroline, suggesting that it is a metalloprotease. The activity of the EDTA-inactivated protease could be partially restored by the addition of Ca2+ and Zn2+ together. The molecular weight and inhibition data show some similarities with proteases isolated from other Vibrio species such as Vibrio cholerae and Vibrio vulnificus.

Original languageEnglish (US)
Pages (from-to)3432-3436
Number of pages5
JournalBiochemistry
Volume30
Issue number14
StatePublished - 1991

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Vibrio
Purification
Bacteria
Peptide Hydrolases
Chromatography
Edetic Acid
Hemorrhagic Septicemia
High pressure liquid chromatography
Vibrio vulnificus
Agarose Chromatography
Vibrio cholerae
Ammonium Sulfate
Metalloproteases
Protease Inhibitors
Electrophoresis
Sodium Dodecyl Sulfate
Sepharose
Fish
Serine
Cysteine

ASJC Scopus subject areas

  • Biochemistry

Cite this

Purification and characterization of a secreted protease from the pathogenic marine bacterium vibrio anguillarum. / Farrell, David.

In: Biochemistry, Vol. 30, No. 14, 1991, p. 3432-3436.

Research output: Contribution to journalArticle

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AB - Vibrio anguillarum is a pathogenic marine bacterium which causes the disease vibriosis in salmonid fish, which is characterized by a fatal hemorrhagic septicemia accompanied by massive tissue destruction. In this paper, the purification of the major caseinolytic extracellular protease from V. anguillarum is presented. The purification steps include ammonium sulfate precipitation, DEAE-Sepharose chromatography, Sephacryl S-200 chromatography, and DEAE high-pressure liquid chromatography. The purified protease migrates with Mr = 38000 upon sodium dodecyl sulfate-polyacrylamide gel electrophoresis. A slightly larger protease of Mr 40000 is also separated by this procedure, but accounts for only a minor fraction of the caseinolytic activity. The Mr 38 000 protease displays a broad pH activity profile in the neutral to basic range. It is not inhibited by serine, cysteine, or acid protease inhibitors, but is inhibited by EDTA and 1,10-phenanthroline, suggesting that it is a metalloprotease. The activity of the EDTA-inactivated protease could be partially restored by the addition of Ca2+ and Zn2+ together. The molecular weight and inhibition data show some similarities with proteases isolated from other Vibrio species such as Vibrio cholerae and Vibrio vulnificus.

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