Purification and characterization of an elastolytic protease of Vibrio vulnificus.
Large amounts of a highly purified, extracellular elastolytic protease of Vibrio vulnificus were obtained by sequential ammonium sulphate precipitation and hydrophobic interaction chromatography with phenyl-Sepharose CL-4B. The protease had an Mr of about 50,500 (estimated by SDS-PAGE), a pI of 5.7, and a temperature optimum range of 55 to 60 degrees C. The pH optimum and the results of inactivation studies suggested that the enzyme was a neutral metalloprotease. The protease had about 429 amino acid residues, and the first 20 amino-terminal amino acid residues were Ala-Gln-Ala-Asn-Gly-Thr-Gly-Pro-Gly-Gly-Asn-Ser-Lys-Thr-Gly-Arg-Tyr-Glu- Phe-Gly . The purified protease was toxic for mice (about 1.5 mg kg-1 and 4.5 mg kg-1, intraperitoneal and intravenous LD50 values, respectively), and subcutaneous injection of the enzyme elicited rapid and extensive dermonecrosis.
Kothary
M H
MH
Department of Microbiology and Immunology, Bowman Gray School of Medicine of Wake Forest University, Winston-Salem, North Carolina 27103.
Kreger
A S
AS
D000596:Amino Acids / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007123:Immunoelectrophoresis, Two-Dimensional; D007525:Isoelectric Focusing; D010447:Peptide Hydrolases / Q000302:isolation & purification*; D013696:Temperature; D014733:Vibrio / Q000201:enzymology*
D000596:Amino Acids; D010447:Peptide Hydrolases