Abstract
The protein TCP-1 (t-complex polypeptide 1) is a subunit of the hetero-oligomeric complex CCT (chaperonin containing TCP- 1) present in the eukaryotic cytosol. Chaperone function may be critical for the development and survival of the different life stages of Schistosoma mansoni, a parasite that is exposed to drastic environmental changes during its development. We isolated a full-length S. mansoni TCP-1 cDNA (SmTCP-1A) encoding a protein highly homologous with TCP-1. The deduced SmTCP-1A amino-acid sequence shows up to 65% identity with other eukaryotic CCT family members. Semiquantitative reverse transcriptase-polymerase chain reaction (RT-PCR) analysis revealed that the mRNA expression levels of SmTCP-1A in adult S. mansoni were down-regulated in worms subjected to heat shock and oxidative stress conditions. This down-regulation of SmTCP-1A mRNA may reflect a switch in CCT subunits as an adaptive response to heat shock and oxidative stress conditions.
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