| 摘要 |
Novel acellular anti-pertussis vaccines are described, which comprises a non-toxic double mutant of pertussis toxin (PT), filamentous haemagglutinin (FHA) and the 69 kilodaltons protein (69Kd) taken alone or in combination with the diphtheria and tetanus anatoxin. The completely non-toxic double mutant of the PT is characterized by the fact that is comprises in the amino acid sequence of the S1 subunit the substitution of Glu 129 and of one of any other amino acid of the subunit, whose substitution brings about a decrease in toxicity, by natural amino acids. Moreover there are described purification methods for, and the characterisation of the FHA and the 69 Kd protein expressed by transformed B. pertussis W28-9K/129G strains, which produce the PT double mutant and by transformed B. pertussis W28- DELTA Tox which do not produce the PT. These proteins are particularly suitable for preparing safer and more immunogenic acellular anti-pertussis vaccine. |
