Lactobacillus bulgaricus proteinase expressed in Lactococcus lactis is a powerful carrier for cell wall-associated and secreted bovine beta-lactoglobulin fusion proteins.

Abstract:

:Lactic acid bacteria have a good potential as agents for the delivery of heterologous proteins to the gastrointestinal mucosa and thus for the reequilibration of inappropriate immune responses to food antigens. Bovine beta-lactoglobulin (BLG) is considered a major allergen in cow's milk allergy. We have designed recombinant Lactococcus lactis expressing either full-length BLG or BLG-derived octapeptide T6 (IDALNENK) as fusions with Lactobacillus bulgaricus extracellular proteinase (PrtB). In addition to constructs encoding full-length PrtB for the targeting of heterologous proteins to the cell surface, we generated vectors aiming at the release into the medium of truncated PrtB derivatives lacking 100 (PrtB partial differential, PrtB partial differential-BLG, and PrtB partial differential-T6) or 807 (PrtBdelta) C-terminal amino acids. Expression of recombinant products was confirmed using either anti-PrtB, anti-BLG, or anti-peptide T6 antiserum. All forms of the full-length and truncated recombinant products were efficiently translocated, irrespective of the presence of eucaryotic BLG sequences in the fusion proteins. L. lactis expressing PrtB partial differential-BLG yielded up to 170 microg per 10(9) CFU in the culture supernatant and 9 microg per 10(9) CFU at the bacterial cell surface within 14 h. Therefore, protein fusions relying on the use of PrtB gene products are adequate for concomitant cell surface display and secretion by recombinant L. lactis and thus may ensure maximal bioavailability of the eucaryotic antigen in the gut-associated lymphoid tissue.

journal_name

Appl Environ Microbiol

authors

Bernasconi E,Germond JE,Delley M,Fritsché R,Corthésy B

doi

10.1128/aem.68.6.2917-2923.2002

keywords:

subject

Has Abstract

pub_date

2002-06-01 00:00:00

pages

2917-23

issue

6

eissn

0099-2240

issn

1098-5336

journal_volume

68

pub_type

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