A proteomic investigation of Streptococcus agalactiae grown under conditions associated with neonatal exposure reveals the upregulation of the putative virulence factor C protein beta antigen

International Journal of Medical Microbiology : IJMM
Qian YangIain C Sutcliffe

Abstract

Streptococcus agalactiae is a major neonatal pathogen that is able to adapt to a variety of host environments, including both rectal and vaginal maternal carriage, growth in amniotic fluid and at various neonatal body sites. As such it is important to elucidate the patterns of protein expression that are associated with S. agalactiae growth under these different in vivo conditions. To this end, we have grown S. agalactiae strain A909 under in vitro conditions reflecting those associated with maternal vaginal carriage (low pH, low oxygen, nutrient stress) and those associated with exposure to body fluids during invasive disease (neutral pH, aeration, nutrient sufficient). The protein profiles of bacterial cells grown under each of these conditions were compared using a proteome approach. A total of 76 proteins were reproducibly identified 16 of which were shown to be differentially expressed. The putative virulence factor C protein beta and several proteins linked to resistance to oxidative stress were found to be upregulated under the conditions hypothesised to reflect those associated with foetal exposure to S. agalactiae. Thus, these data add to the currently limited understanding of the molecular basis of S. agalactiae GBS a...Continue Reading

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Citations

Apr 25, 2012·Antonie van Leeuwenhoek·Qian YangIain C Sutcliffe
Nov 8, 2017·Infection and Immunity·Thomas A HoovenAdam J Ratner
Sep 25, 2017·Frontiers in Cellular and Infection Microbiology·Sarah Shabayek, Barbara Spellerberg

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