Article (Scientific journals)
Regulation of neuraminidase expression in Streptococcus pneumoniae
Gualdi, L.; Hayre, J. K.; Gerlini, A. et al.
2012In BMC Microbiology, 12
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Keywords :
Carbon catabolite repression; Metabolic regulation; Sialic acid; ABC transporter; Streptococcus; Streptococcus gordonii; Streptococcus mitis; Streptococcus oralis; Streptococcus pneumoniae; Streptococcus sanguinis; Gene Expression Profiling; Gene Expression Regulation, Bacterial; Hexosamines; Humans; N-Acetylneuraminic Acid; Neuraminidase; Operon
Abstract :
[en] Background: Sialic acid (N-acetylneuraminic acid; NeuNAc) is one of the most important carbohydrates for Streptococcus pneumoniae due of its role as a carbon and energy source, receptor for adhesion and invasion and molecular signal for promotion of biofilm formation, nasopharyngeal carriage and invasion of the lung. Results: In this work, NeuNAc and its metabolic derivative N-acetyl mannosamine (ManNAc) were used to analyze regulatory mechanisms of the neuraminidase locus expression. Genomic and metabolic comparison to Streptococcus mitis, Streptococcus oralis, Streptococcus gordonii and Streptococcus sanguinis elucidates the metabolic association of the two amino sugars to different parts of the locus coding for the two main pneumococcal neuraminidases and confirms the substrate specificity of the respective ABC transporters. Quantitative gene expression analysis shows repression of the locus by glucose and induction of all predicted transcriptional units by ManNAc and NeuNAc, each inducing with higher efficiency the operon encoding for the transporter with higher specificity for the respective amino sugar. Cytofluorimetric analysis demonstrated enhanced surface exposure of NanA on pneumococci grown in NeuNAc and ManNAc and an activity assay allowed to quantify approximately twelve times as much neuraminidase activity on induced cells as opposed to glucose grown cells. Conclusions: The present data increase the understanding of metabolic regulation of the nanAB locus and indicate that experiments aimed at the elucidation of the relevance of neuraminidases in pneumococcal virulence should possibly not be carried out on bacteria grown in glucose containing media. © 2012 Gualdi et al.; licensee BioMed Central Ltd.
Disciplines :
Microbiology
Author, co-author :
Gualdi, L.;  Dipartimento di Biotecnologie, Universit di Siena, Siena, Italy
Hayre, J. K.;  Dipartimento di Biotecnologie, Universit di Siena, Siena, Italy
Gerlini, A.;  Dipartimento di Biotecnologie, Universit di Siena, Siena, Italy
Bidossi, A.;  Dipartimento di Biotecnologie, Universit di Siena, Siena, Italy
Colomba, L.;  Dipartimento di Biotecnologie, Universit di Siena, Siena, Italy
Trappetti, C.;  Dipartimento di Biotecnologie, Universit di Siena, Siena, Italy, Research Centre for Infectious Diseases, School of Molecular and Biomedical Science, University of Adelaide, SA 5005, Australia
Pozzi, G.;  Dipartimento di Biotecnologie, Universit di Siena, Siena, Italy
Docquier, Jean-Denis ;  Université de Liège - ULiège > Département des sciences de la vie > Centre d'ingénierie des protéines
Andrew, P.;  Department of Infection Immunity and Inflammation, University of Leicester, Leicester, United Kingdom
Ricci, S.;  Dipartimento di Biotecnologie, Universit di Siena, Siena, Italy
Oggioni, M. R.;  Dipartimento di Biotecnologie, Universit di Siena, Siena, Italy, UOC Batteriologia, Azienda Universitaria Ospedaliera Senese, Siena, Italy, LAMMB, Policlinico le Scotte Lotto, 5 piano 1, Siena, 53100, Italy, Research Centre for Infectious Diseases, School of Molecular and Biomedical Science, University of Adelaide, SA 5005, Australia
Language :
English
Title :
Regulation of neuraminidase expression in Streptococcus pneumoniae
Publication date :
2012
Journal title :
BMC Microbiology
eISSN :
1471-2180
Publisher :
BioMed Central, United Kingdom
Volume :
12
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 222983 - PNEUMOPATH - A comprehensive dissection of pneumococcal-host interactions
Funders :
CE - Commission Européenne [BE]
Available on ORBi :
since 19 November 2020

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