Limited diversity of Streptococcus pneumoniae psaA among pneumococcal vaccine serotypes.
Infect Immun
; 65(5): 1967-71, 1997 May.
Article
em En
| MEDLINE
| ID: mdl-9125591
ABSTRACT
The pneumococcal surface adhesin A (PsaA) is a surface-exposed protein of the gram-positive bacterium Streptococcus pneumoniae. It belongs to a group of proteins designated the lipoprotein receptor I antigen family. The gene encoding PsaA from an encapsulated strain of pneumococcal serotype 6B was cloned and sequenced. The peptide sequence was compared to that of homologs found in S. pneumoniae serotype 2, viridans streptococci, and Enterococcus faecalis. Identity values among the deduced peptides ranged from 57 to 98%. The polymorphism of psaA was examined among the 23 encapsulated vaccine serotypes by using PCR-restriction fragment length polymorphism analysis. Ten different enzymes were used to analyze 80 strains representing the 23 serotypes in a 23-valent polysaccharide vaccine. This analysis showed that restriction sites within the gene were highly conserved, with only a minor variation occurring in 10% of the strains, the result of an additional Tsp509I site. The lack of variation for the other restriction sites within the gene examined here indicates that psaA is genetically conserved, an important characteristic necessary for a candidate common protein vaccine.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Membrana Transportadoras
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Streptococcus pneumoniae
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Proteínas de Bactérias
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Complexo de Proteína do Fotossistema I
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Lipoproteínas
Idioma:
En
Ano de publicação:
1997
Tipo de documento:
Article