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. 1996 May;3(3):270–274. doi: 10.1128/cdli.3.3.270-274.1996

Cloning and expression of a putative alcohol dehydrogenase gene of Entamoeba histolytica and its application to immunological examination.

A Kimura 1, Y Hara 1, T Kimoto 1, Y Okuno 1, Y Minekawa 1, T Nakabayashi 1
PMCID: PMC170328  PMID: 8705667

Abstract

To clone and express the genes encoding major antigens of Entamoeba histolytica, we constructed a lambda gt11 cDNA library for E. histolytica HM1:IMSS and screened it with pooled sera from patients with amoebiasis. A 1,223-bp cDNA was cloned (clone 1223), and its nucleotide sequence was determined. The amino acid sequence predicted to be encoded by the open reading frame of clone 1223 consisted of 396 residues and showed 32.5 and 32.3% homology to the NADH-dependent butanol dehydrogenases I and II (bdhA and bdhB) of Clostridium acetobutylicum, respectively. In addition, 29 of the 34 consensus positions of bdhA and bdhB were also well conserved in clone 1223. The recombinant protein expressed from clone 1223 had an estimated molecular mass of 43.5 kDa as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The antigenicity and specificity of the recombinant protein were evaluated by an enzyme-linked immunosorbent assay using sera obtained from two clinical groups of patients with amoebiasis and a group of healthy controls. The recombinant protein had potent and specific antigenicity. In all, 53 serum samples (88.3%) from 60 patients with amoebiasis were positive for immunoglobulin G antibody against the recombinant protein, with a mean optical density value of 0.42. In contrast, 53 of 54 healthy control serum samples were negative, with only 1 positive serum sample showing the lower optical density value. These results suggested that clone 1223 is promising in terms of providing a useful antigen for the accurate serodiagnosis of amoebiasis and that the gene encodes a putative alcohol dehydrogenase of E. histolytica.

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Selected References

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