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Applied and Environmental Microbiology
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PHYSIOLOGY AND BIOTECHNOLOGY

Monoclonal Antibodies to the Cell-Wall-Associated Proteinase of Lactococcus lactis subsp. cremoris Wg2

Harry Laan, Eddy J. Smid, Loe de Leij, Edwin Schwander, Wil N. Konings
Harry Laan
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Eddy J. Smid
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Loe de Leij
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Edwin Schwander
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Wil N. Konings
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ABSTRACT

Twelve monoclonal antibodies directed to the cell-wall-associated proteinase of Lactococcus lactis subsp. cremoris Wg2 were isolated after immunization of BALB/c mice with a partially purified preparation of the proteinase. The monoclonal antibodies reacted with the 126-kilodalton proteinase band in a Western immunoblot. All but one of the monoclonal antibodies reacted with protein bands with a molecular weight below 126,000, possibly degradation products of the proteinase. The monoclonal antibodies could be divided into six groups according to their different reactions with the proteinase degradation products in the Western blot. Different groups of monoclonal antibodies reacted with different components of the L. lactis subsp. cremoris Wg2 proteinase. Crossed immunoelectrophoresis showed that monoclonal antibody groups I, II, and III react with proteinase component A and that groups IV, V, and VI react with proteinase component B. The isolated monoclonal antibodies cross-reacted with the proteinases of other L. lactis subspecies. Monoclonal antibodies of group IV cross-reacted with proteinase component C of other L. lactis subsp. cremoris strains. The molecular weight of the proteinase attached to the cells of L. lactis subsp. cremoris Wg2 was 200,000, which is different from the previously reported values. This could be analyzed by immunodetection of the proteinase on a Western blot. This value corresponds to the molecular weight calculated from the amino acid sequence of the cloned L. lactis subsp. cremoris Wg2 proteinase gene.

FOOTNOTES

  • ↵* Corresponding author.

  • Copyright © 1988, American Society for Microbiology
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Monoclonal Antibodies to the Cell-Wall-Associated Proteinase of Lactococcus lactis subsp. cremoris Wg2
Harry Laan, Eddy J. Smid, Loe de Leij, Edwin Schwander, Wil N. Konings
Applied and Environmental Microbiology Sep 1988, 54 (9) 2250-2256; DOI:

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Monoclonal Antibodies to the Cell-Wall-Associated Proteinase of Lactococcus lactis subsp. cremoris Wg2
Harry Laan, Eddy J. Smid, Loe de Leij, Edwin Schwander, Wil N. Konings
Applied and Environmental Microbiology Sep 1988, 54 (9) 2250-2256; DOI:
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