In vitro effect of temperature on the conformational structure and collagen binding of SdrF, a Staphylococcus epidermidis adhesin

Antonella Di Poto, Massimiliano Papi, Sheetal Trivedi, Alessandro Maiorana, Paola Gavazzo, Massimo Vassalli, Franklin D. Lowy, Marco De Spirito, Lucio Montanaro, Marcello Imbriani, Carla Renata Arciola, Livia Visai

Research output: Contribution to journalArticlepeer-review

Abstract

Staphylococcus epidermidis is the leading etiologic agent of device-related infections. S. epidermidis is able to bind, by means of the adhesins of its cell wall, the host matrix proteins filming the artificial surfaces. Thence, bacteria cling to biomaterials and infection develops. The effect of temperature on integrity, structure, and biological activity of the collagen-binding adhesin (SdrF) of S. epidermidis has been here investigated. By cloning in E. coli XL1-Blue, a recombinant of the SdrF binding domain B (rSdrFB), carrying an N-terminal polyhistidine, was obtained. Purification was by HiTrapTM Chelating HP columns. Assessment of purity, molecular weight, and integrity was by SDS-PAGE. The rSdrFB-collagen binding was investigated by ELISA. A full three-dimensional reconstruction of rSdrFB was achieved by small-angle X-ray scattering (SAXS). At 25 °C, rSdrFB bound to type I collagen in a dose-dependent, saturable manner, with a Kd of 2.48 × 10−7 M. When temperature increased from 25 to 37 °C, a strong conformational change occurred, together with the abolition of the rSdrFB-collagen binding. The rSdrFB integrity was not affected by temperature variation. SdrFB-collagen binding is switched on/off depending on the temperature. Implications with the infection pathogenesis are enlightened.

Original languageEnglish
Pages (from-to)5593-5603
Number of pages11
JournalApplied Microbiology and Biotechnology
Volume99
Issue number13
DOIs
Publication statusPublished - Feb 17 2015

Keywords

  • Collagen
  • Hypothermia
  • Normalized spatial discrepancies (NSD)
  • Opportunistic infections
  • SdrF adhesin
  • Small-angle X-ray scattering (SAXS)
  • Staphylococcus epidermidis

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology

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