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ScientificWorldJournal. 2012;2012:128705. doi: 10.1100/2012/128705. Epub 2012 May 15.

Association of Acinetobacter baumannii EF-Tu with cell surface, outer membrane vesicles, and fibronectin.

Author information

1
Department of Biology, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.

Abstract

A conundrum has long lingered over association of cytosol elongation factor Tu (EF-Tu) with bacterial surface. Here we investigated it with Acinetobacter baumannii, an emerging opportunistic pathogen associated with a wide spectrum of infectious diseases. The gene for A. baumannii EF-Tu was sequenced, and recombinant EF-Tu was purified for antibody development. EF-Tu on the bacterial surface and the outer membrane vesicles (OMVs) was revealed by immune electron microscopy, and its presence in the outer membrane (OM) and the OMV subproteomes was verified by Western blotting with the EF-Tu antibodies and confirmed by proteomic analyses. EF-Tu in the OM and the OMV subproteomes bound to fibronectin as detected by Western blot and confirmed by a label-free real-time optical sensor. The sensor that originates from photonic crystal structure in a total-Internal-reflection (PC-TIR) configuration was functionalized with fibronectin for characterizing EF-Tu binding. Altogether, with a novel combination of immunological, proteomical, and biophysical assays, these results suggest association of A. baumannii EF-Tu with the bacterial cell surface, OMVs, and fibronectin.

PMID:
22666090
PMCID:
PMC3362023
DOI:
10.1100/2012/128705
[Indexed for MEDLINE]
Free PMC Article

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