Trypanosoma cruzi trans-sialidase (TcTS)

Trypanosoma cruzi trans-sialidase (TcTS) is a unique surface-anchored enzyme and a primary virulence factor of the protozoan parasite responsible for Chagas disease. Unlike most organisms, T. cruzi is unable to synthesize sialic acid de novo and relies on TcTS to scavenge these sugars from host glycoconjugates, transferring them to mucin-like molecules on the parasite's own surface. This enzymatic activity creates a molecular cloak that allows the parasite to evade the host's innate and adaptive immune responses, including protection against complement-mediated lysis. Beyond immune evasion, TcTS is critical for host cell attachment, invasion, and the subsequent escape of the parasite from the parasitophorous vacuole into the host cytoplasm. Because the trans-glycosylation activity of TcTS has no known human analog, it represents a highly attractive target for the development of specific trypanocidal drugs. Current research focuses on the design of transition-state analogs and small-molecule inhibitors to disrupt the parasite's life cycle and restore host immune efficacy.

Other names

TcTSSialyltransferaseNeuraminidase-like proteinT. cruzi trans-sialidaseSialidase

Inhibition of the transfer of sialic acid from host sialoglycoconjugates to parasite surface mucins, thereby preventing immune cloaking and inhibiting host cell invasion.