Abstract
A fusion gene named LT-B-M5 was constructed encoding the entire B subunit of Escherichia coli labile toxin (LT-B), a 7 amino acid proline-rich linker, and 15 amino-terminal amino acids of type 5 streptococcal M protein. The purified LT-B-M5 was immunogenic in rabbits and evoked antibodies against a synthetic peptide copy of the amino-terminus of M5 (SM5[1-15]) and the native M5 protein and opsonic antibodies against type 5 streptococci. The hybrid protein retained the ganglioside-binding activity of LT-B and was tested in mice for its immunogenicity after local administration. Mice that were immunized intranasally with LT-B-M5 developed serum antibodies against SM5(1-15) and were significantly protected from death after intraperitoneal challenge infections with type 5 streptococci. The data show that protective systemic immune responses may be evoked after intranasal immunization with a fragment of M protein fused to LT-B.
Publication types
-
Research Support, U.S. Gov't, Non-P.H.S.
-
Research Support, U.S. Gov't, P.H.S.
MeSH terms
-
Administration, Intranasal
-
Animals
-
Antibodies, Bacterial / biosynthesis
-
Antibodies, Bacterial / blood
-
Antigens, Bacterial / immunology*
-
Bacterial Outer Membrane Proteins*
-
Bacterial Proteins / genetics
-
Bacterial Proteins / immunology*
-
Bacterial Toxins / genetics
-
Bacterial Toxins / immunology*
-
Bacterial Toxins / metabolism
-
Bacterial Vaccines / administration & dosage
-
Bacterial Vaccines / immunology*
-
Base Sequence
-
Carrier Proteins*
-
Enterotoxins / genetics
-
Enterotoxins / immunology*
-
Enterotoxins / metabolism
-
Escherichia coli / genetics
-
Escherichia coli Proteins*
-
Female
-
Gangliosides / metabolism
-
Mice
-
Mice, Inbred BALB C
-
Molecular Sequence Data
-
Rabbits
-
Recombinant Fusion Proteins / administration & dosage
-
Recombinant Fusion Proteins / immunology*
-
Recombinant Fusion Proteins / isolation & purification
-
Recombinant Fusion Proteins / metabolism
-
Streptococcal Infections / prevention & control*
-
Streptococcus / immunology*
-
Vaccination
-
Vaccines, Synthetic / administration & dosage
-
Vaccines, Synthetic / immunology
Substances
-
Antibodies, Bacterial
-
Antigens, Bacterial
-
Bacterial Outer Membrane Proteins
-
Bacterial Proteins
-
Bacterial Toxins
-
Bacterial Vaccines
-
Carrier Proteins
-
Enterotoxins
-
Escherichia coli Proteins
-
Gangliosides
-
Recombinant Fusion Proteins
-
Vaccines, Synthetic
-
streptococcal M protein
-
heat-labile enterotoxin, E coli