A gene encoding a 69-kilodalton major surface protein of Giardia intestinalis trophozoites

  • Ey P
  • Khanna K
  • Manning P
 et al. 
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A gene encoding a 68.5-kDa trophozoite surface protein (TSP11) of the Australian Giardia intestinalis (syn. G. lamblia) isolate, Ad-1, has been cloned from a genomic expression library screened with an antiserum specific for 3 major surface antigens. Sequence analysis of two overlapping genomic fragments identified a single open reading frame that contained no introns and predicted a cysteine-rich, 667-residue polypeptide with features common to other trophozoite surface proteins. These include the presence of 27 copies of the 4-amino acid Cys-X-X-Cys motif, an N-terminal signal sequence and a highly conserved, hydrophobic C-terminal segment. Transcripts from the tsp11 gene were detected as a single band on Northern blots using total RNA extracted from Ad-1 trophozoites. Primer extension analysis indicated that the mRNA has a 5' untranslated region of only 5 nt, similar to the very short (1-6 nt) leader sequences reported for other Giardia mRNAs. A large portion of the promoter distal segment of tsp1 has homology with tsa417, a gene encoding a 72.5-kDa trophozoite surface antigen of the Afghanistan-derived G. intestinalis isolate, WB [13]. © 1993.

Author-supplied keywords

  • Giardia intestinalis
  • Giardia lamblia
  • Membrane protein
  • Surface antigen

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  • Peter L. Ey

  • Kum Kum Khanna

  • Paul A. Manning

  • Graham Mayrhofer

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