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. 1989 Jul;57(7):1959–1967. doi: 10.1128/iai.57.7.1959-1967.1989

Trypanosoma cruzi expresses diverse repetitive protein antigens.

D F Hoft 1, K S Kim 1, K Otsu 1, D R Moser 1, W J Yost 1, J H Blumin 1, J E Donelson 1, L V Kirchhoff 1
PMCID: PMC313827  PMID: 2659529

Abstract

We screened a Trypanosoma cruzi cDNA expression library with human and rabbit anti-T. cruzi sera and identified cDNA clones that encode polypeptides containing tandemly arranged repeats which are 6 to 34 amino acids in length. The peptide repeats encoded by these cDNAs varied markedly in sequence, copy number, and location relative to the polyadenylation site of the mRNAs from which they were derived. The repeats were specific for T. cruzi, but in each case the sizes of the corresponding mRNAs and the total number of repeat copies encoded varied considerably among different isolates of the parasite. Expression of the peptide repeats was not stage specific. One of the peptide repeats occurred in a protein with an Mr of greater than 200,000 and one was in a protein of Mr 75,000 to 105,000. The frequent occurrence and diversity of these peptide repeats suggested that they may play a role in the ability of the parasite to evade immune destruction in its invertebrate and mammalian hosts, but the primary roles of these macromolecules may be unrelated to the host-parasite relationship.

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Selected References

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