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- W2020735206 abstract "Among the Trichinella TSL-1 antigens, whose antigenicity is generally due mainly to tyvelose-containing epitopes, gp53 is unusual in that its antigenicity is due mainly to protein epitopes. In the present study we mapped two of these epitopes, recognized by monoclonal antibodies (mAbs) that specifically recognize gp53 from all encysting Trichinella species (mAb US9), or gp53 from Trichinella spiralis alone (mAb US5). Based on previously published sequences of this glycoprotein [Mol. Biochem. Parasitol. 72 (1995) 253], in this study, we cloned the full gp53 cDNA from a new strain, Trichinella britovi (ISS 11; AN: ), and from another T. spiralis isolate (ISS 115; AN: ). The gp53 sequence comprised an ORF of 1239bp, coding for 412 amino acids, with 61 nucleotide differences (resulting in 38 residue changes) between the two species. Mapping of US5- and US9-recognized epitopes was undertaken through the construction and expression in the pGEX4T vector of truncated gp53 peptides, and by the construction of peptides derived from the antigenic regions. The epitope recognized by mAb US9 was a linear peptide of 8 residues, 33Met- 40Ser, located in the amino-terminal region, while the corresponding epitope recognized by mAb US5 was a 47-amino acid sequence containing two alpha-helix regions flanked by random coils, 290Thr- 336Lys. Molecular modeling of these peptides seems to indicate that recognition of the US9 epitope depends on the presence of two available hydroxyl groups provided by one methionine and one serine on T. spiralis gp53 (not present on Trichinella pseudospiralis gp53). Additionally, the stability of the US5 epitope seems to depend on correct folding of the 47-amino acid sequence (only present in T. spiralis). The relevance of these findings for understanding the antigenic recognition of Trichinella TSL-1 antigens, and for further studies to investigate possible function(s) of gp53 in Trichinella, is discussed." @default.
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- W2020735206 date "2004-06-01" @default.
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- W2020735206 title "Minor interspecies variations in the sequence of the gp53 TSL-1 antigen of Trichinella define species-specific immunodominant epitopes1" @default.
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- W2020735206 doi "https://doi.org/10.1016/j.molimm.2004.03.032" @default.
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