Respiration metabolism of Group B Streptococcus is activated by environmental haem and quinone and contributes to virulence.
Mol Microbiol
; 56(2): 525-34, 2005 Apr.
Article
em En
| MEDLINE
| ID: mdl-15813741
ABSTRACT
Group B Streptococcus (GBS) is a common constituent of the vaginal microflora, but its transmission to newborns can cause life-threatening sepsis, pneumonia and meningitis. Energy metabolism of this opportunist pathogen has been deduced to be strictly fermentative. We discovered that GBS undergoes respiration metabolism if its environment supplies two essential respiratory components quinone and haem. Respiration metabolism led to significant changes in growth characteristics, including a doubling of biomass and an altered metabolite profile under the tested conditions. The GBS respiratory chain is inactivated by (i) withdrawing haem and/or quinone, (ii) treating cultures with a respiration inhibitor or (iii) inactivating the cydA gene product, a subunit of cytochrome bd quinol oxidase, in all cases resulting in exclusively fermentative growth. cydA inactivation reduced GBS growth in human blood and strongly attenuated virulence in a neonatal rat sepsis model, suggesting that the animal host may supply the components that activate GBS respiration. These results suggest a role of respiration metabolism in GBS dissemination. Our findings show that environmental factors can increase the flexibility of GBS metabolism by activating a newly identified respiration chain. The need for two environmental factors may explain why GBS respiration metabolism was not found in previous studies.
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Base de dados:
MEDLINE
Assunto principal:
Streptococcus agalactiae
/
Benzoquinonas
/
Metabolismo Energético
/
Heme
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article