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A monoclonal antibody (MAb), MAb 900, which detects a 43-kDa protein present on Escherichia coli was found. Subsequently, more than 90 organisms, belonging to either the bacterial, archaeal, or eucaryal domain, were tested for reactivity to this MAb. Of the bacterial and archaeal domains, almost all species proved to be positive, whereas all organisms from the eucaryal domain gave negative results. The 43-kDa protein was purified by affinity chromatography and subsequently analyzed by microsequencing methods. Two peptide sequences which showed a high degree of homology (&gt; 99%) to the prokaryotic elongation factor Tu (EF-Tu) were obtained. Western blot (immunoblot) analysis using both purified EF-Tu and EF-Tu domains confirmed that the unknown protein was EF-Tu. The panbacterial distribution of EF-Tu, which is present in large amounts in every prokaryotic cell, renders this protein a good candidate for a diagnostic approach. In consequence, we have used the anti-EF-Tu MAb 900 to design both a dot blot assay and an enzyme-linked immunosorbent assay. From either blood culture, urine, or gall-bladder fluid, bacterial contamination could be detected. The sensitivity of these tests is currently 10(4) bacteria per ml.

An epitope of elongation factor Tu is widely distributed within the bacterial and archaeal domains