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The exoproteome profiles of three Staphylococcus saprophyticus strains reveal diversity in protein secretion contents.

Abstract：

:Staphylococcus saprophyticus is a gram-positive microorganism responsible for urinary tract infections (UTIs). Although some virulence factors are characterized, such as urease, autolysins, adhesins and hemagglutinins, large-scale proteomic studies have not been performed within this species. We performed the characterization of the exoproteome from three S. saprophyticus strains: the reference strain ATCC 15,305, a non-capsular strain 7108 and the 9325 strain containing a thick capsule which were cultured in BHI medium and culture supernatants were analysed by using mass spectrometry approach. We observed a core of 72 secreted proteins. In addition, it was possible to detect diversity in the protein profiles of the exoproteomes. Interestingly, strain 7108 presented no secretion of three antigenic proteins, including the classical SsaA antigen. In addition, the level of antigenic proteins secreted by strain 9325 was higher than in ATCC 15,305. This result was confirmed by Western blot analysis using anti-SsaA polyclonal antibodies, and no production/ secretion of SsaA was detected in strain 7108. Transcriptional data shows that 7108 strain produces transcripts encoding SsaA, suggesting post-transcriptional regulation occurs in this strain. Moreover, when compared with the other strains that were analyzed, it was possible to detect higher levels of proteases secreted by strain 7108 and higher levels of antigenic proteins and transglycosylases secreted by 9325 strain. The results reveal diversity in protein secretion among strains. This research is an important first step towards understanding the variability in S. saprophyticus exoproteome profile and could be significant in explaining differences among strains.

journal_name

Microbiol Res

journal_title

Microbiological research

authors

Oliveira AS,Rosa IIR,Novaes E,Oliveira LS,Baeza LC,Borges CL,Marlinghaus L,Soares CMA,Giambiagi-deMarval M,Parente-Rocha JA

doi

10.1016/j.micres.2018.08.008

subject

Has Abstract

pub_date

2018-11-01 00:00:00

pages

85-96

eissn

0944-5013

issn

1618-0623

pii

S0944-5013(18)30541-X

journal_volume

216

pub_type

杂志文章

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