Analysis of heat-induced changes in protein expression of Stenotrophomonas maltophilia K279a reveals a role for GroEL in the host-temperature adaptation

Brunella Posteraro, Francesca Bugli, Federica Iavarone, Giovanni Fadda, Maurizio Sanguinetti, Elena De Carolis, Ada Florio, Rosanna Inzitari, Massimo Castagnola, Bianca Colonna, Gianni Prosseda, Ersilia Fiscarelli

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Stenotrophomonas maltophilia is a microorganism of environmental and clinical importance as well as a frequent airway colonizer of cystic fibrosis (CF) individuals. We combined 2-DE and MALDI-TOF MS to profile the protein expression in S. maltophilia K279a, a completely sequenced clinical isolate, grown at 37 °C with respect to the strain grown at 26 °C. Among the proteins up-regulated at 37 °C, we identified GroEL, a molecular chaperone that mainly assist the folding and unfolding of proteins under both normal and stress conditions. A 2.4-kb groESL mRNA was detected independently by Northern blot analyses with a groES- and a groEL-specific probe, indicating that S. maltophilia groES and groEL form an operon. Primer extension analysis of S. maltophilia groESL done in Escherichia coli showed that 2 promoters, Pσ(32) and Pσ(70), were utilized under the heat-shock and normal condition, respectively, whereas S. maltophilia groEL was shown to act as a heat-shock gene at 37 °C, 42 °C, and, to a lesser extent, at 50 °C by real-time RT-PCR analyses. Finally, immunoblot analyses revealed that S. maltophilia GroEL strongly reacted with sera from CF patients chronically infected by the microorganism, but did not with sera from CF patients with sporadic infection or uninfected.
Original languageEnglish
Pages (from-to)273-281
Number of pages9
JournalInternational Journal of Medical Microbiology
Volume301
Publication statusPublished - 2011

Keywords

  • S. maltophilia

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